Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age

SUMMARY: Continuous genetic improvement of high yielding broiler strains necessitates reevaluation of amino acid requirements. The objective of this study was to evaluate the dIle requirement of Ross 708 x Ross YP male broilers from d 0 to 18. Experimental diets were created from a common deficient...

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Autores principales:	A.T. Brown, J. Lee, R. Adhikari, K. Haydon, K.G.S. Wamsley
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	isoleucine optimal ratio amino acids starter phase live performance Animal culture SF1-1100 Food processing and manufacture TP368-456
Acceso en línea:	https://doaj.org/article/2784e6faee634d8a8857929e86f3673c
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spelling	oai:doaj.org-article:2784e6faee634d8a8857929e86f3673c2021-11-24T04:27:11ZDetermining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age1056-617110.1016/j.japr.2021.100217https://doaj.org/article/2784e6faee634d8a8857929e86f3673c2022-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1056617121000805https://doaj.org/toc/1056-6171SUMMARY: Continuous genetic improvement of high yielding broiler strains necessitates reevaluation of amino acid requirements. The objective of this study was to evaluate the dIle requirement of Ross 708 x Ross YP male broilers from d 0 to 18. Experimental diets were created from a common deficient corn and soybean meal-based diet providing a dIle:dLys of 52%; after manufacturing, half was retained for the creation of the summit diet (82% dIle:dLys). The remaining 5 experimental diets ranged from 57 to 77% dIle:dLys and were blended proportions of deficient and summit dIle diets. A practical control diet (PRAC-CON; 67% dIle:dLys) was manufactured separately for verification of the blended control diet (50 deficient:50 summit blend; BLEND-CON; 67% dIle:dLys); all diets were subsequently pelleted/crumbled. On d of hatch, 2,400 male chicks were equally allocated to 96 pens (12 replications/treatment). 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). Performance data demonstrated that feeding higher than starter breed nutrient specifications, for broilers, at the time of this study (67% dIle:dLys) improved broiler performance from 0 to 18 d. After considering the estimated requirements produced by the multiple regression models for all measured variables (BW, BW gain, FCR, and CV of ending BW), these data suggest that the optimum starter dIle:dLys ratio for male Ross 708 × Ross YP broilers from 0 to 18 d, ranged from 63 to 74% dIle:dLys. Further research should evaluate dIle:dLys requirements of male Ross 708 × Ross YP broilers during the remaining grow-out phases.A.T. BrownJ. LeeR. AdhikariK. HaydonK.G.S. WamsleyElsevierarticleisoleucineoptimal ratioamino acidsstarter phaselive performanceAnimal cultureSF1-1100Food processing and manufactureTP368-456ENJournal of Applied Poultry Research, Vol 31, Iss 1, Pp 100217- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	isoleucine optimal ratio amino acids starter phase live performance Animal culture SF1-1100 Food processing and manufacture TP368-456
spellingShingle	isoleucine optimal ratio amino acids starter phase live performance Animal culture SF1-1100 Food processing and manufacture TP368-456 A.T. Brown J. Lee R. Adhikari K. Haydon K.G.S. Wamsley Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age
description	SUMMARY: Continuous genetic improvement of high yielding broiler strains necessitates reevaluation of amino acid requirements. The objective of this study was to evaluate the dIle requirement of Ross 708 x Ross YP male broilers from d 0 to 18. Experimental diets were created from a common deficient corn and soybean meal-based diet providing a dIle:dLys of 52%; after manufacturing, half was retained for the creation of the summit diet (82% dIle:dLys). The remaining 5 experimental diets ranged from 57 to 77% dIle:dLys and were blended proportions of deficient and summit dIle diets. A practical control diet (PRAC-CON; 67% dIle:dLys) was manufactured separately for verification of the blended control diet (50 deficient:50 summit blend; BLEND-CON; 67% dIle:dLys); all diets were subsequently pelleted/crumbled. On d of hatch, 2,400 male chicks were equally allocated to 96 pens (12 replications/treatment). 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). Performance data demonstrated that feeding higher than starter breed nutrient specifications, for broilers, at the time of this study (67% dIle:dLys) improved broiler performance from 0 to 18 d. After considering the estimated requirements produced by the multiple regression models for all measured variables (BW, BW gain, FCR, and CV of ending BW), these data suggest that the optimum starter dIle:dLys ratio for male Ross 708 × Ross YP broilers from 0 to 18 d, ranged from 63 to 74% dIle:dLys. Further research should evaluate dIle:dLys requirements of male Ross 708 × Ross YP broilers during the remaining grow-out phases.
format	article
author	A.T. Brown J. Lee R. Adhikari K. Haydon K.G.S. Wamsley
author_facet	A.T. Brown J. Lee R. Adhikari K. Haydon K.G.S. Wamsley
author_sort	A.T. Brown
title	Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age
title_short	Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age
title_full	Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age
title_fullStr	Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age
title_full_unstemmed	Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age
title_sort	determining the optimum digestible isoleucine to lysine ratio for ross 708 x ross yp male broilers from 0 to 18 d of age
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/2784e6faee634d8a8857929e86f3673c
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Determining the optimum digestible isoleucine to lysine ratio for Ross 708 x Ross YP male broilers from 0 to 18 d of age

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