Requirement of Sulfur Containing Amino Acid for White Leghorn Growing Chickens of 10-20 Weeks of Age

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  • 大雛の含硫アミノ酸要求量
  • ダイヒナ ノ ガンリュウアミノサン ヨウキュウリョウ

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Abstract

To determine SAA (sulfur containing amino acid) requirement for White Leghorn growing chickens, low protein diets containing 0.25% (basal) -0.55% SAA were fed chickens from 10 to 20 weeks of age. Basal diet was semi-purified diet mainly composed of cornstarch and soybean meal, and contained 8% protein, 0.25% SAA and 75% TDN (total digestible nutrients). Levels of SAA in the diets were corrected by DL-methionine. After 20 weeks of age, a standard laying diet was fed all the pullets.<br>Body weight gain, feed efficiency and nitrogen retention of the chickens fed a low protein basal diet during 10-20 weeks of age, decreased drastically. However, the addition of 0.05% methionine to the basal diet showed a significant increase in growth rate, feed efficiency and nitrogen retention. Maximum weight gain, feed efficiency and nitrogen retention were seen in the pullets fed a diet containing 0.40% SAA (0.15% methionine supplemented to the basal diet).<br>Pullets fed a basal diet delayed sexual maturity significantly, while subsequent egg production, egg weight, feed consumption and feed conversion during laying period were not affected by SAA levels in the diets fed chickens at 10-20 weeks of age.<br>It was concluded that for maximum growth, optimum SAA level in the diet of growing chickens of 10-20 weeks of age was 0.40%, while only 0.30% SAA level in growing diet was adequate to optimum sexual maturity and subsequent egg production.

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