Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics

Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein...
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Autor*in:	F. G. Ríos-Rincón [verfasserIn] A. Estrada-Angulo [verfasserIn] A. Plascencia [verfasserIn] M. A. López-Soto [verfasserIn] B. I. Castro-Pérez [verfasserIn] J. J. Portillo-Loera [verfasserIn] J. C. Robles-Estrada [verfasserIn] J. F. Calderón-Cortes [verfasserIn] H. Dávila-Ramos [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2014

Schlagwörter:	Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response

Übergeordnetes Werk:	In: Asian-Australasian Journal of Animal Sciences - Asian-Australasian Association of Animal Production Societies, 2017, 27(2014), 1, Seite 55-61
Übergeordnetes Werk:	volume:27 ; year:2014 ; number:1 ; pages:55-61

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.5713/ajas.2013.13307

Katalog-ID:	DOAJ079603394

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650		4	\|a Energy Intake
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spelling	10.5713/ajas.2013.13307 doi (DE-627)DOAJ079603394 (DE-599)DOAJ64e9928e15f543afbec2d7f776223918 DE-627 ger DE-627 rakwb eng SF1-1100 QP501-801 F. G. Ríos-Rincón verfasserin aut Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage. Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response Animal culture Animal biochemistry A. Estrada-Angulo verfasserin aut A. Plascencia verfasserin aut M. A. López-Soto verfasserin aut B. I. Castro-Pérez verfasserin aut J. J. Portillo-Loera verfasserin aut J. C. Robles-Estrada verfasserin aut J. F. Calderón-Cortes verfasserin aut H. Dávila-Ramos verfasserin aut In Asian-Australasian Journal of Animal Sciences Asian-Australasian Association of Animal Production Societies, 2017 27(2014), 1, Seite 55-61 (DE-627)756825873 (DE-600)2727534-6 19765517 nnns volume:27 year:2014 number:1 pages:55-61 https://doi.org/10.5713/ajas.2013.13307 kostenfrei https://doaj.org/article/64e9928e15f543afbec2d7f776223918 kostenfrei http://www.ajas.info/upload/pdf/ajas-27-1-55-6.pdf kostenfrei https://doaj.org/toc/1011-2367 Journal toc kostenfrei https://doaj.org/toc/1976-5517 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 27 2014 1 55-61
allfields_unstemmed	10.5713/ajas.2013.13307 doi (DE-627)DOAJ079603394 (DE-599)DOAJ64e9928e15f543afbec2d7f776223918 DE-627 ger DE-627 rakwb eng SF1-1100 QP501-801 F. G. Ríos-Rincón verfasserin aut Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage. Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response Animal culture Animal biochemistry A. Estrada-Angulo verfasserin aut A. Plascencia verfasserin aut M. A. López-Soto verfasserin aut B. I. Castro-Pérez verfasserin aut J. J. Portillo-Loera verfasserin aut J. C. Robles-Estrada verfasserin aut J. F. Calderón-Cortes verfasserin aut H. Dávila-Ramos verfasserin aut In Asian-Australasian Journal of Animal Sciences Asian-Australasian Association of Animal Production Societies, 2017 27(2014), 1, Seite 55-61 (DE-627)756825873 (DE-600)2727534-6 19765517 nnns volume:27 year:2014 number:1 pages:55-61 https://doi.org/10.5713/ajas.2013.13307 kostenfrei https://doaj.org/article/64e9928e15f543afbec2d7f776223918 kostenfrei http://www.ajas.info/upload/pdf/ajas-27-1-55-6.pdf kostenfrei https://doaj.org/toc/1011-2367 Journal toc kostenfrei https://doaj.org/toc/1976-5517 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 27 2014 1 55-61
allfieldsGer	10.5713/ajas.2013.13307 doi (DE-627)DOAJ079603394 (DE-599)DOAJ64e9928e15f543afbec2d7f776223918 DE-627 ger DE-627 rakwb eng SF1-1100 QP501-801 F. G. Ríos-Rincón verfasserin aut Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage. Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response Animal culture Animal biochemistry A. Estrada-Angulo verfasserin aut A. Plascencia verfasserin aut M. A. López-Soto verfasserin aut B. I. Castro-Pérez verfasserin aut J. J. Portillo-Loera verfasserin aut J. C. Robles-Estrada verfasserin aut J. F. Calderón-Cortes verfasserin aut H. Dávila-Ramos verfasserin aut In Asian-Australasian Journal of Animal Sciences Asian-Australasian Association of Animal Production Societies, 2017 27(2014), 1, Seite 55-61 (DE-627)756825873 (DE-600)2727534-6 19765517 nnns volume:27 year:2014 number:1 pages:55-61 https://doi.org/10.5713/ajas.2013.13307 kostenfrei https://doaj.org/article/64e9928e15f543afbec2d7f776223918 kostenfrei http://www.ajas.info/upload/pdf/ajas-27-1-55-6.pdf kostenfrei https://doaj.org/toc/1011-2367 Journal toc kostenfrei https://doaj.org/toc/1976-5517 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 27 2014 1 55-61
allfieldsSound	10.5713/ajas.2013.13307 doi (DE-627)DOAJ079603394 (DE-599)DOAJ64e9928e15f543afbec2d7f776223918 DE-627 ger DE-627 rakwb eng SF1-1100 QP501-801 F. G. Ríos-Rincón verfasserin aut Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage. Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response Animal culture Animal biochemistry A. Estrada-Angulo verfasserin aut A. Plascencia verfasserin aut M. A. López-Soto verfasserin aut B. I. Castro-Pérez verfasserin aut J. J. Portillo-Loera verfasserin aut J. C. Robles-Estrada verfasserin aut J. F. Calderón-Cortes verfasserin aut H. Dávila-Ramos verfasserin aut In Asian-Australasian Journal of Animal Sciences Asian-Australasian Association of Animal Production Societies, 2017 27(2014), 1, Seite 55-61 (DE-627)756825873 (DE-600)2727534-6 19765517 nnns volume:27 year:2014 number:1 pages:55-61 https://doi.org/10.5713/ajas.2013.13307 kostenfrei https://doaj.org/article/64e9928e15f543afbec2d7f776223918 kostenfrei http://www.ajas.info/upload/pdf/ajas-27-1-55-6.pdf kostenfrei https://doaj.org/toc/1011-2367 Journal toc kostenfrei https://doaj.org/toc/1976-5517 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 27 2014 1 55-61
language	English
source	In Asian-Australasian Journal of Animal Sciences 27(2014), 1, Seite 55-61 volume:27 year:2014 number:1 pages:55-61
sourceStr	In Asian-Australasian Journal of Animal Sciences 27(2014), 1, Seite 55-61 volume:27 year:2014 number:1 pages:55-61
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response Animal culture Animal biochemistry
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container_title	Asian-Australasian Journal of Animal Sciences
authorswithroles_txt_mv	F. G. Ríos-Rincón @@aut@@ A. Estrada-Angulo @@aut@@ A. Plascencia @@aut@@ M. A. López-Soto @@aut@@ B. I. Castro-Pérez @@aut@@ J. J. Portillo-Loera @@aut@@ J. C. Robles-Estrada @@aut@@ J. F. Calderón-Cortes @@aut@@ H. Dávila-Ramos @@aut@@
publishDateDaySort_date	2014-01-01T00:00:00Z
hierarchy_top_id	756825873
id	DOAJ079603394
language_de	englisch
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callnumber-first	S - Agriculture
author	F. G. Ríos-Rincón
spellingShingle	F. G. Ríos-Rincón misc SF1-1100 misc QP501-801 misc Energy Intake misc Carcass Composition misc Feedlot Hair Sheep misc Growth Performance misc Productive Response misc Animal culture misc Animal biochemistry Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics
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topic_title	SF1-1100 QP501-801 Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics Energy Intake Carcass Composition Feedlot Hair Sheep Growth Performance Productive Response
topic	misc SF1-1100 misc QP501-801 misc Energy Intake misc Carcass Composition misc Feedlot Hair Sheep misc Growth Performance misc Productive Response misc Animal culture misc Animal biochemistry
topic_unstemmed	misc SF1-1100 misc QP501-801 misc Energy Intake misc Carcass Composition misc Feedlot Hair Sheep misc Growth Performance misc Productive Response misc Animal culture misc Animal biochemistry
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title	Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics
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title_full	Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics
author_sort	F. G. Ríos-Rincón
journal	Asian-Australasian Journal of Animal Sciences
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author_browse	F. G. Ríos-Rincón A. Estrada-Angulo A. Plascencia M. A. López-Soto B. I. Castro-Pérez J. J. Portillo-Loera J. C. Robles-Estrada J. F. Calderón-Cortes H. Dávila-Ramos
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author-letter	F. G. Ríos-Rincón
doi_str_mv	10.5713/ajas.2013.13307
author2-role	verfasserin
title_sort	influence of protein and energy level in finishing diets for feedlot hair lambs: growth performance, dietary energetics and carcass characteristics
callnumber	SF1-1100
title_auth	Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics
abstract	Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage.
abstractGer	Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage.
abstract_unstemmed	Forty-eight Pelibuey×Katahdin male intact lambs (23.87±2.84 kg) were used in an 84-d feeding trial, with six pens per treatment in a 2×2 factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (<2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage.
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title_short	Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics
url	https://doi.org/10.5713/ajas.2013.13307 https://doaj.org/article/64e9928e15f543afbec2d7f776223918 http://www.ajas.info/upload/pdf/ajas-27-1-55-6.pdf https://doaj.org/toc/1011-2367 https://doaj.org/toc/1976-5517
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Influence of Protein and Energy Level in Finishing Diets for Feedlot Hair Lambs: Growth Performance, Dietary Energetics and Carcass Characteristics

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