Methionine requirement of growing Japanese quails

•Methionine requirements of growing Japanese quails were determined using different models.•The mean value of methionine requirements for gain, feed/gain, breast meat yield, and leg meat yield were 5.21, 5.12, 5.37, and 5.95g/kg of diet, respectively.•The mean value of total sulfur amino acids (TSAA...

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Bibliographic Details
Published in:Animal feed science and technology 2016-02, Vol.212, p.122-128
Main Authors: Khosravi, H., Mehri, M., Bagherzadeh-Kasmani, F., Asghari-Moghadam, M.
Format: Article
Language:English
Subjects:
Breast meat yield
Leg meat yield
Methionine
Quail chick
Sulfur amino acids
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Summary:•Methionine requirements of growing Japanese quails were determined using different models.•The mean value of methionine requirements for gain, feed/gain, breast meat yield, and leg meat yield were 5.21, 5.12, 5.37, and 5.95g/kg of diet, respectively.•The mean value of total sulfur amino acids (TSAA) for gain, feed/gain, breast meat yield, and leg meat yield were 9.20, 9.11, 9.36, 9.94, and 9.71g/kg of diet, respectively.•Methionine requirements for maximising carcass yield might be higher than those needed for maximising performance and estimated values of methionine and TSAA requirements were 16 and 25%, respectively, higher than those recommended by NRC (1994). In most cases that poultry diets are based on corn–soybean meal, methionine may be the first growth limiting amino acid that should be supplemented through synthetic dl-methionine. Since there is limited information on amino acid requirements of modern Japanese quails especially on methionine, a dose-response experiment with seven doses of dietary methionine (3.80, 4.30, 4.80, 5.30, 5.80, 6.30, and 6.80g/kg of diet) was conducted to estimate the nutritional needs of quail chicks for methionine. A total of 420, 7-day old quail chicks were randomly allotted to one of seven dietary treatments with 5 replicate pens and 12 birds per pen. Performance traits including feed intake (FI), weight gain (G), and feed/gain and carcass attributes including breast meat yield (BMY) and leg meat yield (LMY) were measured and used to fit several models (e.g., spline and quadratic polynomial models) for requirement estimations. Dietary treatments significantly affected all response parameters (P
ISSN:0377-8401
1873-2216
DOI:10.1016/j.anifeedsci.2015.12.017