Níveis de metionina + cistina digestível para poedeiras leves no período de 42 a 58 semanas de idade
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Data
2010
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Resumo
Aiming at determining levels of digestible sulfurous amino acids to establish the ideal methionine +
cystine/lysine relationship in rations for light-weight laying hens in the period from 42 to 58 weeks of age, 216 birds
of the commercial brand Hy- Line W36 were distributed in a randomized block design with 6 diets, 6 repetitions and 6
birds per experimental unit. The level of digestible lysine used in the experimental diet was 0.770% for an expected average
consumption of 731 mg/hen/day of lysine and 95 g/hen/day of ration. Levels of digestible sulfurous amino acids were
obtained from a basal diet deficient in digestible methionine + cystine (0.65%), supplemented with 0.00; 0.05, 0.10, 0.15,
0.20 and 0.25% of DL-methionine (99.2%), so to provide a methionine + cystine/lysine relationship of 84, 91, 97, 104,
110 and 117%. The experimental period lasted for 16 weeks and it was subdivided in 4 cycles of egg collection, each one
corresponding to 28 days. There was a quadratic effect of the digestible methionine + cistine levels of 0.826% and 0.775%
on the egg production and lysine utilization efficiency for total egg production, respectively. The digestible methionine
+ cystine level considered as a requirement for light-weight laying hens in the period from 42 to 58 weeks of age were
0.775%, corresponding to digestible methionine + cystine consumption of 708 mg/hen/day, and a methionine + cystine/
lysine relationship of 101%.
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Palavras-chave
Aminoácidos essenciais, Exigências nutricionais, Galinhas, Proteína ideal, Essential amino acids, Hens, Ideal protein, Nutritional requirements
Citação
BRUMANO, Gladstone et al. Níveis de metionina + cistina digestível para poedeiras leves no período de 42 a 58 semanas de idade. Revista Brasileira de Zootecnia, Viçosa, v. 39, n. 9, p. 1984-1992, 2010.