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dc.creatorMello, Heloisa Helena de Carvalho-
dc.creatorGomes, Paulo Cezar-
dc.creatorRocha, Tatiana Cristina da-
dc.creatorDonzele, Juarez Lopes-
dc.creatorAlmeida, Rodrigo Lopes de-
dc.creatorTroni, Allan Reis-
dc.creatorCarvalho, Bruno Reis de-
dc.creatorViana, Gabriel da Silva-
dc.identifier.citationMELLO, Heloisa Helena de Carvalho et al. Determination of digestible isoleucine: lysine ratio in diets for laying hens aged 42-58 weeks. Revista Brasileira de Zootecnia, Viçosa, v. 41, n. 5, p. 1313-1317, 2012.pt_BR
dc.identifier.issne- 1806-9290-
dc.description.abstractTwo hundred and fifty-two Hy-Line W36 laying hens were allotted in a completely randomized design with 6 treatments, 7 replicates and 6 hens per experimental unit in order to determine the ideal ratio of isoleucine (Ile) in relation to lysine (Lys) to laying hens aged 42-58 weeks. Experimental diets contained digestible Ile at different levels, 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). A basal diet was formulated to provide Isoleucine in levels below recommendations. This diet was supplemented with L-isoleucine to make up the 6 diets. Each diet was made isonitrogenous by varying the dietary contents of glutamic acid and isocaloric by adjusting the contents of cornstarch. All essential amino acids were provided proportionally to lysine. Egg production, egg weight, egg mass, feed conversion ratio, albumen, yolk and eggshell contents were recorded and compiled at every 28-day period. No differences were observed in the performance over a wide range of dietary isoleucine concentrations from 5.76 to 7.73 g/kg corresponding to 0.73:1 to 0.98:1 Ile:Lys ratios. The lowest Ile:Lys ratio (0.73:1) was sufficient to ensure satisfactory performance of birds, corresponding to the consumption of 534 mg of isoleucine and 731 mg of lysine/day.pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectDigestible amino acidspt_BR
dc.subjectEgg qualitypt_BR
dc.subjectIdeal proteinpt_BR
dc.subjectWhite laying henspt_BR
dc.titleDetermination of digestible isoleucine:lysine ratio in diets for laying hens aged 42-58 weekspt_BR
dc.publisher.departmentEscola de Medicina Veterinária e Zootecnia - EVZ (RG)pt_BR
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