Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age

SUMMARY: Previous research within our laboratory determined the optimal male Ross 708 dIle:dLys ratio for the starter phase to be greater than recent breeder recommendations (70 vs. 67%). Thus, the current objective was to assess the subsequent growth phase (grower) in order to evaluate the optimal...

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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 requirement amino acids grower phase optimal ratio Animal culture SF1-1100 Food processing and manufacture TP368-456
Acceso en línea:	https://doaj.org/article/f8bb830739dd43baa89b4a7b66ea4fa6
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spelling	oai:doaj.org-article:f8bb830739dd43baa89b4a7b66ea4fa62021-11-22T04:19:07ZDetermining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age1056-617110.1016/j.japr.2021.100192https://doaj.org/article/f8bb830739dd43baa89b4a7b66ea4fa62021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1056617121000556https://doaj.org/toc/1056-6171SUMMARY: Previous research within our laboratory determined the optimal male Ross 708 dIle:dLys ratio for the starter phase to be greater than recent breeder recommendations (70 vs. 67%). Thus, the current objective was to assess the subsequent growth phase (grower) in order to evaluate the optimal dIle:dLys ratio for maximized growth performance of Ross 708 × Ross YP male broilers. On d of hatch, 2,400 chicks were equally allocated to 96 pens and fed a common starter diet. On d 14, pen weights were equalized by block (12 replications/treatments). Experimental grower diets (d 14–28) were created from a common Deficient (53% dIle:dLys) corn and soybean meal-based diet. After batching, half of the Deficient diet was used to create the Summit diet (83% dIle:dLys). The remaining 5 experimental diets ranged from 58 to 78% dIle:dLys and were blended proportions of the Deficient and Summit diets. A practical control diet (PRAC-CON; 68% dIle:dLys) was manufactured separately to verify the blended control diet (BLEND-CON; 68% dIle:dLys). 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). Based on the current data and using multiple regression models the estimated ratios ranged from 62 to 68% for BW and BWG, and 67-70% for FCR and are similar to the current breeder nutrient specifications for the grower phase. Further research should evaluate dIle:dLys requirements of male Ross 708 × Ross YP broilers during the remaining grow-out phases.A.T. BrownJ.T. LeeR. AdhikariK. HaydonK.G.S. WamsleyElsevierarticleisoleucinerequirementamino acidsgrower phaseoptimal ratioAnimal cultureSF1-1100Food processing and manufactureTP368-456ENJournal of Applied Poultry Research, Vol 30, Iss 4, Pp 100192- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	isoleucine requirement amino acids grower phase optimal ratio Animal culture SF1-1100 Food processing and manufacture TP368-456
spellingShingle	isoleucine requirement amino acids grower phase optimal ratio 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 14 to 28 days of age
description	SUMMARY: Previous research within our laboratory determined the optimal male Ross 708 dIle:dLys ratio for the starter phase to be greater than recent breeder recommendations (70 vs. 67%). Thus, the current objective was to assess the subsequent growth phase (grower) in order to evaluate the optimal dIle:dLys ratio for maximized growth performance of Ross 708 × Ross YP male broilers. On d of hatch, 2,400 chicks were equally allocated to 96 pens and fed a common starter diet. On d 14, pen weights were equalized by block (12 replications/treatments). Experimental grower diets (d 14–28) were created from a common Deficient (53% dIle:dLys) corn and soybean meal-based diet. After batching, half of the Deficient diet was used to create the Summit diet (83% dIle:dLys). The remaining 5 experimental diets ranged from 58 to 78% dIle:dLys and were blended proportions of the Deficient and Summit diets. A practical control diet (PRAC-CON; 68% dIle:dLys) was manufactured separately to verify the blended control diet (BLEND-CON; 68% dIle:dLys). 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). Based on the current data and using multiple regression models the estimated ratios ranged from 62 to 68% for BW and BWG, and 67-70% for FCR and are similar to the current breeder nutrient specifications for the grower phase. 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.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 14 to 28 days of age
title_short	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age
title_full	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age
title_fullStr	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age
title_full_unstemmed	Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age
title_sort	determining the optimal digestible isoleucine to lysine ratio of ross 708 × ross yp male broilers from 14 to 28 days of age
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/f8bb830739dd43baa89b4a7b66ea4fa6
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Determining the optimal digestible isoleucine to lysine ratio of Ross 708 × Ross YP male broilers from 14 to 28 days of age

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