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