Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition
Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characte...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Fleurance, Géraldine [verfasserIn] Rossignol, Nicolas [verfasserIn] Dumont, Bertrand [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2022 |
|---|
| Schlagwörter: |
|---|
| Übergeordnetes Werk: |
Enthalten in: Applied animal behaviour science - Amsterdam [u.a.] : Elsevier Science, 1984, 252 |
|---|---|
| Übergeordnetes Werk: |
volume:252 |
| DOI / URN: |
10.1016/j.applanim.2022.105652 |
|---|
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ELV007976127 |
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| 245 | 1 | 0 | |a Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition |
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| 520 | |a Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. | ||
| 650 | 4 | |a Grasslands | |
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| 650 | 4 | |a Diet selection | |
| 700 | 1 | |a Rossignol, Nicolas |e verfasserin |4 aut | |
| 700 | 1 | |a Dumont, Bertrand |e verfasserin |4 aut | |
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10.1016/j.applanim.2022.105652 doi (DE-627)ELV007976127 (ELSEVIER)S0168-1591(22)00110-1 DE-627 ger DE-627 rda eng 590 DE-600 12 22 ssgn BIODIV DE-30 fid 42.66 bkl Fleurance, Géraldine verfasserin aut Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. Grasslands Foraging Animal-based method Direct observations Bite Diet selection Rossignol, Nicolas verfasserin aut Dumont, Bertrand verfasserin aut Enthalten in Applied animal behaviour science Amsterdam [u.a.] : Elsevier Science, 1984 252 Online-Ressource (DE-627)306311712 (DE-600)1495873-9 (DE-576)090954394 0168-1591 nnns volume:252 GBV_USEFLAG_U SYSFLAG_U GBV_ELV FID-BIODIV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 42.66 Ethologie Biologie AR 252 |
| spelling |
10.1016/j.applanim.2022.105652 doi (DE-627)ELV007976127 (ELSEVIER)S0168-1591(22)00110-1 DE-627 ger DE-627 rda eng 590 DE-600 12 22 ssgn BIODIV DE-30 fid 42.66 bkl Fleurance, Géraldine verfasserin aut Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. Grasslands Foraging Animal-based method Direct observations Bite Diet selection Rossignol, Nicolas verfasserin aut Dumont, Bertrand verfasserin aut Enthalten in Applied animal behaviour science Amsterdam [u.a.] : Elsevier Science, 1984 252 Online-Ressource (DE-627)306311712 (DE-600)1495873-9 (DE-576)090954394 0168-1591 nnns volume:252 GBV_USEFLAG_U SYSFLAG_U GBV_ELV FID-BIODIV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 42.66 Ethologie Biologie AR 252 |
| allfields_unstemmed |
10.1016/j.applanim.2022.105652 doi (DE-627)ELV007976127 (ELSEVIER)S0168-1591(22)00110-1 DE-627 ger DE-627 rda eng 590 DE-600 12 22 ssgn BIODIV DE-30 fid 42.66 bkl Fleurance, Géraldine verfasserin aut Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. Grasslands Foraging Animal-based method Direct observations Bite Diet selection Rossignol, Nicolas verfasserin aut Dumont, Bertrand verfasserin aut Enthalten in Applied animal behaviour science Amsterdam [u.a.] : Elsevier Science, 1984 252 Online-Ressource (DE-627)306311712 (DE-600)1495873-9 (DE-576)090954394 0168-1591 nnns volume:252 GBV_USEFLAG_U SYSFLAG_U GBV_ELV FID-BIODIV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 42.66 Ethologie Biologie AR 252 |
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10.1016/j.applanim.2022.105652 doi (DE-627)ELV007976127 (ELSEVIER)S0168-1591(22)00110-1 DE-627 ger DE-627 rda eng 590 DE-600 12 22 ssgn BIODIV DE-30 fid 42.66 bkl Fleurance, Géraldine verfasserin aut Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. Grasslands Foraging Animal-based method Direct observations Bite Diet selection Rossignol, Nicolas verfasserin aut Dumont, Bertrand verfasserin aut Enthalten in Applied animal behaviour science Amsterdam [u.a.] : Elsevier Science, 1984 252 Online-Ressource (DE-627)306311712 (DE-600)1495873-9 (DE-576)090954394 0168-1591 nnns volume:252 GBV_USEFLAG_U SYSFLAG_U GBV_ELV FID-BIODIV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 42.66 Ethologie Biologie AR 252 |
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10.1016/j.applanim.2022.105652 doi (DE-627)ELV007976127 (ELSEVIER)S0168-1591(22)00110-1 DE-627 ger DE-627 rda eng 590 DE-600 12 22 ssgn BIODIV DE-30 fid 42.66 bkl Fleurance, Géraldine verfasserin aut Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. Grasslands Foraging Animal-based method Direct observations Bite Diet selection Rossignol, Nicolas verfasserin aut Dumont, Bertrand verfasserin aut Enthalten in Applied animal behaviour science Amsterdam [u.a.] : Elsevier Science, 1984 252 Online-Ressource (DE-627)306311712 (DE-600)1495873-9 (DE-576)090954394 0168-1591 nnns volume:252 GBV_USEFLAG_U SYSFLAG_U GBV_ELV FID-BIODIV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 42.66 Ethologie Biologie AR 252 |
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Fleurance, Géraldine |
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Fleurance, Géraldine ddc 590 ssgn 12 fid BIODIV bkl 42.66 misc Grasslands misc Foraging misc Animal-based method misc Direct observations misc Bite misc Diet selection Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition |
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590 DE-600 12 22 ssgn BIODIV DE-30 fid 42.66 bkl Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition Grasslands Foraging Animal-based method Direct observations Bite Diet selection |
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diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition |
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Diurnal observations of feeding choices in grazing horses correctly predict their daily diet composition |
| abstract |
Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. |
| abstractGer |
Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. |
| abstract_unstemmed |
Although it is time consuming, performing direct observations of the feeding choices of grazing herbivores remains the reference method because it does not require any destructive vegetation sampling and limits bias associated with the use of indirect markers. It is also the only method for characterizing the use of vegetation patches. These observations are usually performed during the diurnal period only; however, equids graze 16 h per day on average, with 20–50% of their grazing occurring during the nocturnal period. The objective of this paper was to test the representativeness of diurnal observations of horses’ feeding choices to characterize their daily diet. We used an experimental dataset of 54 paired observations of the diurnal and daily (24-h period) diet composition in horses grazing a pasture with differing sward characteristics according to the stocking rate and season. Four classes of bites were considered based on the sward height and vegetation stage, which are key factors affecting selection by horses. The H0 indicated that the 24-h observations of horses’ feeding choices among the four bite types could be correctly predicted by diurnal observations. Using a chi-square test of adequacy to a multinomial distribution, we expected the set of variables to follow a chi-square distribution, with k-1 (k = four bite types) degrees of freedom, under H0. We first used a Kolmogorov-Smirnov test, which showed adequate observed values relative to the expected distribution (p = 0.67). Then, a Bayesian approach was used to estimate the chi-square distribution with parameter υ that best fit our data, and we found that the probability that H0 was true, which was defined as p (υ ≤ 3), was equal to p = 0.92. An analysis of the chi-square residuals did not reveal any bias in the prediction of the different bite types. Finally, the Bray-Curtis similarity indexes used to characterize prediction quality were very high (i.e., > 90%) regardless of the stocking rate and season. All these results indicate a high level of confidence in the hypothesis that the effects of sward structure on the daily diet composition of grazing horses can be predicted by diurnal observations. This methodological advance will help increase the number of observation days and animals in future studies and accurately define the number of factors that can be tested simultaneously. |
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| score |
7.399768 |