Ideal ratio of digestible methionine plus cystine to digestible lysine for growing Japanese quails
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Ideal ratio of digestible methionine plus cystine to digestible lysine for growing Japanese quails
Published on: 11/25/2019
Author/s : Heder J. D’Avila Lima 1, DSc; Sergio L.T. Barreto 2, DSc; Juarez L. Donzele 2, DSc; Ilda F.F. Tinoco 2, DSc; Natália S. Ribas 2, DSc. / 1 Departamento de Zootecnia e Extensão Rural, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brasil; 2 Departamento de Zootecnia, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brasil.
Summary
Background: methionine is considered essential for maintenance, growth, and feather development. Methionine supply during the growth phase can influence the weight at sexual maturity and egg size.
Objectives: to evaluate the effects of several digestible methionine + cystine/digestible lysine ratios for growing Japanese quails (1 to 40 days of age) with repercussions on the early stage of production (41 to 110 days of age).
Methods: a total of 1,000 one-day-old Japanese quails were randomly distributed to five digestible (methionine + cystine)/digestible lysine ratios, with 10 replicates and 20 birds per experimental unit. A basal diet formulated to meet all nutrient requirements was added with graded levels of DL-methionine replacing glutamic acid.
Results: weight of the birds at 40 days, weight gain until 40 days, feed intake, carcass weight, fat, and body protein deposition, methionine + cystine intake and birds viability in the growing phase presented a linear trend. A quadratic effect was observed for feed conversion and uniformity at 40 days of age, and percentage of feathers did not vary. A linear increase occurred in the laying phase for feed intake and weight gain of the birds. No effects of the assessed ratios were observed on the other variables. Conclusions: a 0.73 ratio of digestible (methionine + cystine) to digestible lysine in the growing phase provided uniform growth and satisfying performance of Japanese quails during the laying phase.
Keywords: Coturnix japonica, ideal protein, productive performance, sulfur amino acids.
انجمن تغذیه دام ، طیور و آبزیان استان کرمان جهت ارائه راهکارها و حل مشکلات دامداران، پرورش دهندگان طیور و آبزی پروران استان کرمان از تمامی افراد با تخصص های مرتبط دعوت به همکاری نموده و آماده پذیرش انتقادات و نقطه نظرات سازنده جهت تداوم امر تولیدات دامی می باشد.