Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks
Two hundred fifty-two Hy-Line W36 laying hens were allotted in a randomized block design with 6 treatments, 7 replicates and 6 hens per experimental unit in order to determine the ideal digestible isoleucine: digestible lysine (Ile:Lys) ratio for laying hens aged 24-40 weeks. Experimental diets contained 5.92, 6.33, 6.73, 7.14, 7.54 and 7.95 g/kg of digestible isoleucine, resulting in different Ile:Lys ratios (0.73:1, 0.78:1, 0.83:1, 0.88:1, 0.93:1 and 0.98:1). Experimental diets were isonitrogenous, with different dietary contents of glutamic acid, and made isocaloric by adjusting the levels of cornstarch. All essential amino acids were provided proportionally to digestible lysine. Feed intake, egg production, egg weight, egg mass, feed conversion ratio per egg mass, feed conversion ratio per dozen eggs, albumen, yolk and eggshell content were assessed. Feed intake, egg production, egg mass and feed conversion ratio were influenced by Ile: Lys ratios quadratically. The egg weight was not affected by Ile: Lys ratio. No differences were observed in the egg quality according to Ile: Lys ratios. The data indicates that the optimum digestible isoleucine: digestible lysine ratio for laying hens aged 24-40 week is 0.84:1, corresponding to the consumption of 681 mg of isoleucine and 811 mg of lysine/hen day-1.
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Sociedade Brasileira de Zootecnia
2013
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oai:scielo:S1516-359820130011000032013-10-31Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeksRocha,Tatiana Cristina daDonzele,Juarez LopesGomes,Paulo CezarMello,Heloisa Helena de CarvalhoTroni,Allan ReisViana,Gabriel da Silva digestible amino acid egg mass egg production protein Two hundred fifty-two Hy-Line W36 laying hens were allotted in a randomized block design with 6 treatments, 7 replicates and 6 hens per experimental unit in order to determine the ideal digestible isoleucine: digestible lysine (Ile:Lys) ratio for laying hens aged 24-40 weeks. Experimental diets contained 5.92, 6.33, 6.73, 7.14, 7.54 and 7.95 g/kg of digestible isoleucine, resulting in different Ile:Lys ratios (0.73:1, 0.78:1, 0.83:1, 0.88:1, 0.93:1 and 0.98:1). Experimental diets were isonitrogenous, with different dietary contents of glutamic acid, and made isocaloric by adjusting the levels of cornstarch. All essential amino acids were provided proportionally to digestible lysine. Feed intake, egg production, egg weight, egg mass, feed conversion ratio per egg mass, feed conversion ratio per dozen eggs, albumen, yolk and eggshell content were assessed. Feed intake, egg production, egg mass and feed conversion ratio were influenced by Ile: Lys ratios quadratically. The egg weight was not affected by Ile: Lys ratio. No differences were observed in the egg quality according to Ile: Lys ratios. The data indicates that the optimum digestible isoleucine: digestible lysine ratio for laying hens aged 24-40 week is 0.84:1, corresponding to the consumption of 681 mg of isoleucine and 811 mg of lysine/hen day-1.info:eu-repo/semantics/openAccessSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia v.42 n.11 20132013-11-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001100003en10.1590/S1516-35982013001100003 |
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Rocha,Tatiana Cristina da Donzele,Juarez Lopes Gomes,Paulo Cezar Mello,Heloisa Helena de Carvalho Troni,Allan Reis Viana,Gabriel da Silva |
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Rocha,Tatiana Cristina da Donzele,Juarez Lopes Gomes,Paulo Cezar Mello,Heloisa Helena de Carvalho Troni,Allan Reis Viana,Gabriel da Silva Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
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Rocha,Tatiana Cristina da Donzele,Juarez Lopes Gomes,Paulo Cezar Mello,Heloisa Helena de Carvalho Troni,Allan Reis Viana,Gabriel da Silva |
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Rocha,Tatiana Cristina da |
title |
Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
title_short |
Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
title_full |
Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
title_fullStr |
Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
title_full_unstemmed |
Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
title_sort |
ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks |
description |
Two hundred fifty-two Hy-Line W36 laying hens were allotted in a randomized block design with 6 treatments, 7 replicates and 6 hens per experimental unit in order to determine the ideal digestible isoleucine: digestible lysine (Ile:Lys) ratio for laying hens aged 24-40 weeks. Experimental diets contained 5.92, 6.33, 6.73, 7.14, 7.54 and 7.95 g/kg of digestible isoleucine, resulting in different Ile:Lys ratios (0.73:1, 0.78:1, 0.83:1, 0.88:1, 0.93:1 and 0.98:1). Experimental diets were isonitrogenous, with different dietary contents of glutamic acid, and made isocaloric by adjusting the levels of cornstarch. All essential amino acids were provided proportionally to digestible lysine. Feed intake, egg production, egg weight, egg mass, feed conversion ratio per egg mass, feed conversion ratio per dozen eggs, albumen, yolk and eggshell content were assessed. Feed intake, egg production, egg mass and feed conversion ratio were influenced by Ile: Lys ratios quadratically. The egg weight was not affected by Ile: Lys ratio. No differences were observed in the egg quality according to Ile: Lys ratios. The data indicates that the optimum digestible isoleucine: digestible lysine ratio for laying hens aged 24-40 week is 0.84:1, corresponding to the consumption of 681 mg of isoleucine and 811 mg of lysine/hen day-1. |
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Sociedade Brasileira de Zootecnia |
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2013 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001100003 |
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