福岡県農業総合試験場研究報告

飼料摂取量の違いが横斑プリマスロックを利用した三元交雑肉鶏の発育と産肉性に及ぼす影響

前田統幸^１）・西尾祐介・福原絵里子・津留崎正信^２）
（畜産研究所）

［摘要］飼料摂取量が異なるようにデビーク（断嘴）処理や採餌面積を調節した飼育条件を設定し、飼料摂取量の違いが横斑プリマスロックを利用した三元交雑肉鶏の発育と産肉性に及ぼす影響について検討した。三元交雑肉鶏の飼育条件において、デビーク処理により21～63日齢の飼料摂取量を約13％制限した場合、雄雌ともに35日齢までの制限では生体重に影響しないが、63日齢の生体重、部分肉重量が小さくなった。また、１羽当たり採餌面積を20cm^２にして飼料摂取量を増加させた場合、雄では63日齢の生体重と部分肉重量に増加は見られず、飼料要求率が劣った。雌では、飼料摂取量の増加により生体重が大きくなる傾向が見られ、部分肉重量と割合が増加した。三元交雑肉鶏の飼育条件として、１羽当たりの探餌面積を雄はブロイラーの飼育方法に準じた面積、雌は２倍の面積とした場合の飼料摂取量が適当であり、飼料摂取量の制限は発育に悪影響を及ぼすので避ける必要がある。

［キーワード：三元交雑肉鶏、飼料摂取量、生体重、部分肉重量］

　Effect of Difference in Feed Intake Quantities on the Growth and Muscle Weight of Crossbred Chicks Using Barred Plymouth Rock Male. MAEDA Motoyuki, Yusuke NISHIO, Eriko FUKUHARA and Masanobu TSURUSAKI(Fukuoka Agricultural Research Center, Chikushino, Fukuoka 818-8549, Japan)Bull. Fukuoka Agric. Res. Cent.19: 106 - 109 (2000)

　A study was conducted to investigate the effect of different feed intake quantities on the growth and muscle weight of crossbred chicks((BP×WR)×WR). The difference in feed intake quantity planes were provided by way of two methods: restriction of feed intake by debeaking and increased feed intake by controlling the feed intake area. When the feed intake quantity was restricted by about 13% from 21 to 63 days of age, it didn't influence on the body weight of either the male or female at 35 days of age, but the body weight and the muscle weight at 63 days of age became light. Also, when the feed intake area was expanded to 20cm²/fowl with a view to increasing feed intake quantity, in the case of males, there wasn't any increase in body weight and muscle weight in 63 days of age and the feed conversion was inferior. On the other hand, in the case of females, body weight was the tendency to become heavy, there was increase in muscle weight. As a condition for feeding the crossbred chicks, the feed intake area for feeding a broiler is suitable for the males. Twice of that area is suitable for the females. Restriction of the feed intake quantity must be avoided because it has a bad　influence on the chicks' growth.