大雛期における飼料の蛋白質と含硫アミノ酸の水準および比率が成長, 性成熟およびその後の産卵に果ぼす影響

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  • Effect of Dietary Protein and Sulfur Containing Amino Acid Levels and the Ratios of These Nutrients for Growing Chickens on Their Performance
  • ダイヒナキ ニ オケル シリョウ ノ タンパクシツ ト ガンリュウアミノサン ノ スイジュン オヨビ ヒリツ ガ セイチョウ , セイ セイジュク オヨビ ソノゴ ノ サンラン ニ オヨボス エイキョウ

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Two experiments were conducted to determine the effect of the levels of the dietary UP (crude protein) and SAA (sulfur containing amino acid), and the ratios of SAA to CP in the diets for White Leghorn growing chickens on their performance.<br>Nine experimental diets of 3 CP levels (8, 11 and 14%) X 3 ratios (3.0, 3.75 and 4.5%) of SAA to UP were fed to the chickens from 10-20 weeks of age. All the diets were mainly composed of corn starch and soybean meal. Diets of 3.0% of SAA to CP were not supplemented with methionine, but diets of 3.75 and 4.5% of SAA to CP were corrected by methionine supplementation. After 20 weeks of age, all the pullets were fed a standard laying diet.<br>The results were as follows.<br>1. The growth and feed efficiency of chickens fed 8% CP diet without supplementary methionine decreased drastically, during 10-20 weeks of age, and the reduction was much larger in summer (Expt. 2) than in winter (Expt. 1).<br>2. The addition of methionine to the diets with any of the protein levels improved the growth rate and feed efficiency. The effectiveness of methionine supplementation was much more in 8% CP level than 11 and 14% CP levels in the diet.<br>3. The optimum ratio of SAA to CP was 3.75% at 11 and 14% dietary CP levels, while 4.5% at the lowest protein level.<br>4. Sexual maturity delayed in the pullets fed the lowest protein diet without supplementary methionine, while subsequent egg production, egg weight and feed conversion were not affected by CP level and the ratio of SAA to CP in diets fed during the growing period of chickens.

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