第四十三卷(2014)
畜產試驗所高產蛋土雞品系CM公雞之屠體性狀分析
林德育 賴永裕 林義福 陳怡兆
行政院農業委員會畜產試驗所
行政院農業委員會畜產試驗所育成之土雞高產蛋品系CM，係以畜試土雞近親品系台畜一號L12公雞與配商用褐色蛋雞母雞之雜交一代為基礎族群，經6 個世代自交選育出的高產蛋品系CM。為瞭解品系CM之屠體性能，選留16週齡體重在2.0~2.2公斤的公雞，分別於19週齡與21週齡達2.3公斤以上的公雞進行屠體性狀分析。比較19週齡與21週齡公雞之屠體性狀，平均未去內臟屠體體重、內臟屠體體重、屠宰率及胸腿部佔屠體百分率在兩者間無顯著差異，分別為2240±61公克與2224±98公克、1934±53公克與1936±95公克、78.99%與80.21%及67.72%與67.06%，而胸腿部精肉量佔屠體百分則分別為45.80%與47.24%，且週齡間存在顯著地差異(P<0.01)，顯示飼養21週齡達2.3公斤以上的公雞較飼養19週齡者有較佳的胸腿部精肉量佔屠體百分率。
關鍵語：土雞、屠體性狀、高產蛋
STUDY ON CARCASS CHARACTERISTICS FOR ROOSTERS OF HIGH EGG PRODUCTION LINE L11 NATIVE CHICKEN IN LRI-COA
D. Y. Lin, Y. Y. Lai, Y. F. Lin and Y. C. Chen
Livestock Research Institute, Council of Agriculture, Executive Yuan
LRI-COA high egg production line 11 native chickens, which were selected on high egg production for six generation based on the inbreeding line L11 native chicken of Livestock Research Institute, Council of Agriculture(LRI-COA). To study the carcass characteristics of line L11, we use cocks with 1.8~2.0 kg Body weight at 16 weeks of age as experiment animals. Cocks reached 2.0 kg were slaughter at 19 weeks and 21 weeks of age. Comparison of carcass characteristics of the cocks at different weeks of age in this trail, we found there are no significantly different on GCW (gutted carcass weight), DP(dressing percentage) and BTP (breast and thigh as percentage of carcass weight) of cocks in different ages, and the GCW, DP and BTP of cocks at 19 weeks and 21 weeks of age were 2152±33g and 2076±41g, 82.09% and 82.08%, and 66.43% and 66.37%, respectively. However on NGCW (not gutted carcass weight) (2152±33 g vs. 2076±41 g), Breast as percentage of carcass weight(23.83% vs. 21.20%), thigh as percentage of carcass weight(42.63% vs. 45.17%), there was significant different between 19 and 21 weeks of age (P<0.01). Our result shows roosters rearing up to 2.0 kg over 21 weeks compared with 19 weeks got better thigh as percentage of carcass weight and got worse breast as percentage of carcass weight.
Key Words: Native chicken, Carcass characteristics, High egg production
  
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