Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age

SUMMARY: Recent research within our laboratory has determined the optimal Ross 708 × Ross YP male broiler dIle:dLys ratio for the starter and grower phases to be 70 and 68%, respectively. Thus, the current objective was to continue to re-evaluate the optimal dIle:dLys ratio for this broiler, focusin...

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Autores principales:	A.T. Brown, J.T. Lee, R. Adhikari, K. Haydon, K.G.S. Wamsley
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	isoleucine optimal ratio amino acids finisher phase live performance Animal culture SF1-1100 Food processing and manufacture TP368-456
Acceso en línea:	https://doaj.org/article/9c6382de6ca743d0a78b0946ff4a5156
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spelling	oai:doaj.org-article:9c6382de6ca743d0a78b0946ff4a51562021-11-22T04:19:19ZDetermining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age1056-617110.1016/j.japr.2021.100205https://doaj.org/article/9c6382de6ca743d0a78b0946ff4a51562021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1056617121000684https://doaj.org/toc/1056-6171SUMMARY: Recent research within our laboratory has determined the optimal Ross 708 × Ross YP male broiler dIle:dLys ratio for the starter and grower phases to be 70 and 68%, respectively. Thus, the current objective was to continue to re-evaluate the optimal dIle:dLys ratio for this broiler, focusing on the finisher phase. On d of hatch, 2,400 chicks were equally allocated to 96 pens and fed a common starter (d 0–14; 70% dIle:dLys) and grower diet (d 14–28; 68% dIle:dLys). Pen weights were equalized at d 28 by block (12/treatment). Experimental finisher diets (d 28–42;18.0% crude protein, 3,200 kcal/kg, 0.97% dLys, 130% dLeu:dLys) were created from a common deficient (54% dIle:dLys) corn and soybean meal-based diet and contained animal protein. Half of the deficient was retained to create the summit (84% dIle:dLys). The remaining 5 diets were blended proportions of the deficient and summit diets (ranging from 59 to 79% dIle:dLys). A practical control diet (PRAC-CON; 69% dIle:dLys) was manufactured separately to verify the blended control diet (BLEND-CON). All dIle:dLys ratios were estimated using quadratic regression (QR; 95% of the asymptote), as well as linear and quadratic broken line models (LBL; QBL). Feeding equivalent to or slightly lower than current breeder dIle:dLys recommendations (69%) improved broiler performance from d 28 to 42. Based on the current data and multiple regression models, the estimated ratios ranged from 62 to 66% for BW and BWG and 63 to 66% for FCR. Further research should evaluate the optimal dIle:dLys ratio for this broiler throughout the remaining withdrawal phase.A.T. BrownJ.T. LeeR. AdhikariK. HaydonK.G.S. WamsleyElsevierarticleisoleucineoptimal ratioamino acidsfinisher phaselive performanceAnimal cultureSF1-1100Food processing and manufactureTP368-456ENJournal of Applied Poultry Research, Vol 30, Iss 4, Pp 100205- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	isoleucine optimal ratio amino acids finisher phase live performance Animal culture SF1-1100 Food processing and manufacture TP368-456
spellingShingle	isoleucine optimal ratio amino acids finisher phase live performance Animal culture SF1-1100 Food processing and manufacture TP368-456 A.T. Brown J.T. Lee R. Adhikari K. Haydon K.G.S. Wamsley Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age
description	SUMMARY: Recent research within our laboratory has determined the optimal Ross 708 × Ross YP male broiler dIle:dLys ratio for the starter and grower phases to be 70 and 68%, respectively. Thus, the current objective was to continue to re-evaluate the optimal dIle:dLys ratio for this broiler, focusing on the finisher phase. On d of hatch, 2,400 chicks were equally allocated to 96 pens and fed a common starter (d 0–14; 70% dIle:dLys) and grower diet (d 14–28; 68% dIle:dLys). Pen weights were equalized at d 28 by block (12/treatment). Experimental finisher diets (d 28–42;18.0% crude protein, 3,200 kcal/kg, 0.97% dLys, 130% dLeu:dLys) were created from a common deficient (54% dIle:dLys) corn and soybean meal-based diet and contained animal protein. Half of the deficient was retained to create the summit (84% dIle:dLys). The remaining 5 diets were blended proportions of the deficient and summit diets (ranging from 59 to 79% dIle:dLys). A practical control diet (PRAC-CON; 69% dIle:dLys) was manufactured separately to verify the blended control diet (BLEND-CON). All dIle:dLys ratios were estimated using quadratic regression (QR; 95% of the asymptote), as well as linear and quadratic broken line models (LBL; QBL). Feeding equivalent to or slightly lower than current breeder dIle:dLys recommendations (69%) improved broiler performance from d 28 to 42. Based on the current data and multiple regression models, the estimated ratios ranged from 62 to 66% for BW and BWG and 63 to 66% for FCR. Further research should evaluate the optimal dIle:dLys ratio for this broiler throughout the remaining withdrawal phase.
format	article
author	A.T. Brown J.T. Lee R. Adhikari K. Haydon K.G.S. Wamsley
author_facet	A.T. Brown J.T. Lee R. Adhikari K. Haydon K.G.S. Wamsley
author_sort	A.T. Brown
title	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age
title_short	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age
title_full	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age
title_fullStr	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age
title_full_unstemmed	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age
title_sort	determining the optimal digestible isoleucine to lysine ratio of ross 708 × ross yp male broilers from 28 to 42 days of age
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/9c6382de6ca743d0a78b0946ff4a5156
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Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 28 to 42 days of age

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