Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle

The current experiment was conducted to evaluate the effects of digestible threonine (dThr) on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet during the second cycle. Also, dThr requirements were determined based on nutrient dose-response data...

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Autores principales:	Seyed Amir Hossaninejad, Heydar Zarghi, Abolghasem Golian
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	egg production estimated requirement feed efficiency ideal protein regression model Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/35bcdabeecba4fb38e4e3660bdc9808f
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spelling	oai:doaj.org-article:35bcdabeecba4fb38e4e3660bdc9808f2021-12-01T14:40:59ZEffect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle1594-40771828-051X10.1080/1828051X.2021.2004248https://doaj.org/article/35bcdabeecba4fb38e4e3660bdc9808f2021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/1828051X.2021.2004248https://doaj.org/toc/1594-4077https://doaj.org/toc/1828-051XThe current experiment was conducted to evaluate the effects of digestible threonine (dThr) on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet during the second cycle. Also, dThr requirements were determined based on nutrient dose-response data. A total of 384, 105-week-old post-molt Hy-line-W36 laying hens were allocated to six groups, 0.02% increments, ranging from 0.44 to 0.54% dThr, with eight replicates/treatment and eight birds each, from 105 to 116 wk. By increasing, dThr levels improved egg weight with a linear trend (p <.01), and egg production (EP), egg mass (EM), and feed conversion ratio (FCR) with quadratic trends (p <.05). Hens fed diet contained 0.48% dThr, dThr/digestible Lys (dLys) of 66% showed the best egg production traits. However, feed intake, egg quality traits, blood metabolites, and immune responses were unaffected by dThr levels. Based on the quadratic broken‐line regression models, the dThr requirements of laying hens during the second production cycle for optimised the EP, EM, and FCR were estimated at 507, 514, and 520 mg/hen per day, respectively. These values correspond to 9.84–10.1 mg/g of EM. It is concluded, in the laying hens fed a wheat-based diet during the second cycle, the dietary dThr level of 0.48%, dThr/dLys of 66%, and a daily intake of 520 mg dThr/bird are adequate for optimised performance. The amino acids requirements of laying hens vary depending on trait is considered for optimisation. The dThr requirement estimated for FCR was higher than those for EP and EM.HIGHLIGHTS In the laying hens that feed a wheat-based diet during the second cycle. A dietary digestible threonine concentration of 0.48% and a daily intake of digestible threonine 520 mg/bird are adequate for optimised performance.Seyed Amir HossaninejadHeydar ZarghiAbolghasem GolianTaylor & Francis Grouparticleegg productionestimated requirementfeed efficiencyideal proteinregression modelAnimal cultureSF1-1100ENItalian Journal of Animal Science, Vol 20, Iss 1, Pp 2134-2146 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	egg production estimated requirement feed efficiency ideal protein regression model Animal culture SF1-1100
spellingShingle	egg production estimated requirement feed efficiency ideal protein regression model Animal culture SF1-1100 Seyed Amir Hossaninejad Heydar Zarghi Abolghasem Golian Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
description	The current experiment was conducted to evaluate the effects of digestible threonine (dThr) on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet during the second cycle. Also, dThr requirements were determined based on nutrient dose-response data. A total of 384, 105-week-old post-molt Hy-line-W36 laying hens were allocated to six groups, 0.02% increments, ranging from 0.44 to 0.54% dThr, with eight replicates/treatment and eight birds each, from 105 to 116 wk. By increasing, dThr levels improved egg weight with a linear trend (p <.01), and egg production (EP), egg mass (EM), and feed conversion ratio (FCR) with quadratic trends (p <.05). Hens fed diet contained 0.48% dThr, dThr/digestible Lys (dLys) of 66% showed the best egg production traits. However, feed intake, egg quality traits, blood metabolites, and immune responses were unaffected by dThr levels. Based on the quadratic broken‐line regression models, the dThr requirements of laying hens during the second production cycle for optimised the EP, EM, and FCR were estimated at 507, 514, and 520 mg/hen per day, respectively. These values correspond to 9.84–10.1 mg/g of EM. It is concluded, in the laying hens fed a wheat-based diet during the second cycle, the dietary dThr level of 0.48%, dThr/dLys of 66%, and a daily intake of 520 mg dThr/bird are adequate for optimised performance. The amino acids requirements of laying hens vary depending on trait is considered for optimisation. The dThr requirement estimated for FCR was higher than those for EP and EM.HIGHLIGHTS In the laying hens that feed a wheat-based diet during the second cycle. A dietary digestible threonine concentration of 0.48% and a daily intake of digestible threonine 520 mg/bird are adequate for optimised performance.
format	article
author	Seyed Amir Hossaninejad Heydar Zarghi Abolghasem Golian
author_facet	Seyed Amir Hossaninejad Heydar Zarghi Abolghasem Golian
author_sort	Seyed Amir Hossaninejad
title	Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
title_short	Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
title_full	Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
title_fullStr	Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
title_full_unstemmed	Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
title_sort	effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/35bcdabeecba4fb38e4e3660bdc9808f
work_keys_str_mv	AT seyedamirhossaninejad effectofdigestiblethreonineonperformanceeggqualitybloodmetabolitesandimmuneresponsesinlayinghensfedawheatbaseddietinthesecondcycle AT heydarzarghi effectofdigestiblethreonineonperformanceeggqualitybloodmetabolitesandimmuneresponsesinlayinghensfedawheatbaseddietinthesecondcycle AT abolghasemgolian effectofdigestiblethreonineonperformanceeggqualitybloodmetabolitesandimmuneresponsesinlayinghensfedawheatbaseddietinthesecondcycle
_version_	1718404984209408000

Effect of digestible threonine on performance, egg quality, blood metabolites, and immune responses in laying hens fed a wheat-based diet in the second cycle

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