換羽後飼料の粗蛋白質レベルおよび再給餌方法の産卵成績および卵質への影響

DOI 日本農学文献記事索引 Web Site Web Site 被引用文献2件 参考文献15件
  • 福間 義教
    新潟大学大学院自然科学研究科 日本農産工業株式会社中央研究所
  • 石橋 晃
    新潟大学大学院自然科学研究科

書誌事項

タイトル別名
  • Effect of Crude Protein Level and Refeeding Method of Postmolt Diet on Performance and Egg Quality in Layers after Forced Molting.
  • Effect of Crude Protein Level and Refee

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Effect of crude protein (CP) level and refeeding method of the Postmolt diet on performance and egg quality in layers after forced molting was studied using 1, 000 Single Comb White Leghorn layers. For a control group, another 60 layers did not undergo forced molting and were fed a layer diet (2.85kcal ME/g and 17.3% CP).<br>Forced molting was carried out using only fasting and light control. Fasting was continued until the body weight (BW) of the layers decreased about 30%. The layers were then divided into four groups: the first group was fed a low CP diet (2.57 kcal ME/g and 14.3% CP) ad libitum; the second group, a low CP diet on a restricted feeding schedule; the third group, a high CP diet (2.85 kcal ME/g and 17.3% CP) ad libitum; and the fourth group, a high CP diet on a restricted feeding schedule. In the restrictedfeeding groups, feed volume was increased gradually over 7 days, and then changed to ad libitum. Each group was fed the postmolt diet till egg production reached 5%, and then fed a layer diet.<br>The ad libitum-feeding groups had less accumulated mortalities than the restricted feeding groups during the refeeding period. The layers fed the high CP postmolt diet tended to produce heavier eggs than those fed the low CP diet. Neither CP level nor feeding method affected egg production, egg mass, feed intake, or egg quality after refeeding. The maximum improvement in egg quality (compared with the control group) occurred at week 12 of the fasting period: egg shell strength increased 1.23kg/cm2; haugh units, 10.7; egg shell thickness, 0.038mm; and egg specific gravity, 0.006.<br>These results indicate that an estimated CP content of lower than 14.3% in a postmolt diet is adequate for layers and that ad libitum-feeding is better than restricted-feeding for low mortalities.

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