第四十三卷(2014)
畜試土雞高產蛋品系L11公雞屠體性狀分析
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
畜試土雞高產蛋品系L11係以行政院農業委員會畜產試驗所畜試土雞台畜一號近親品系L11為基礎族群，進行6個世代產蛋數選育所育成的品系。為瞭解品系L11之屠體性能，選留16週齡體重在1.8~2.0公斤的公雞，分別於19週齡與21週齡達2.0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，去內臟屠體體重、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2152±33公克與2076±41公克、82.09%與82.08%及66.43%與66.37%。而平均未去內臟屠體體重、胸部佔屠體百分率、腿部佔屠體百分率在週齡間存在顯著地差異(P<0.01)，分別為2152±33公克與2076±41公克、23.83%與21.20%及42.63%與45.17%。顯示飼養21週齡達2.0公斤以上的公雞較飼養19週齡者有較佳的腿部精肉量佔屠體百分率，而在胸部佔屠體百分率則較低。
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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