계육생산을 위한 부로이라 종계의 육종개발에 관한 연구 ( 제3보 ) = A Study on Improvement of Broiler Breeder Stock for Broiler Production

다국어 초록 (Multilingual Abstract)

The data used in the studies were the records of 45 crosses produced by 3 way cross of 6 strain of fatherline and 7 strain. of mother line, and added 3 strains of imported commercial broiler stock. A total 3,375 chicks of crossbreds were used in this experiment. The results obtained in the study are summarized as follows: (1) Average chick viability was 95.66% and the highest viability was(W×T) strain(98.73%), and the lowest viability was Ym strain(93.33%). There was no significant difference in viability between superior crossbreds and imported broiler stocks. (2) Average body weight at 8 weeks of age was 1,700g and the highest body weight in male lines was Wm strain(1,785g) and the lowest body weight was Xm(1,616g) strain. There was no significant difference between female line and between selected crossbreds and imported broiler stocks on 8 weeks body weight. In statistical analysis in male lines there was significant difference between sire lines. consequently it seems to be important to select sire line. (3) With respect to feed conversion at 8 weeks of age the average feed requirement was 2.26㎏ and the highest feed conversion strain was WY strain(2.17㎏), and the lowest was Xm strain(2.35㎏) in sire lines. In statistical analysis of feed requirement, there was significant difference between sire lines. It seems to be important to select sire line. (4) In point spread at 8 weeks of body weight and feed conversion, the average of point spread was 147.67% and the highest point spread was 177% in imported broiler stocks (5) In carcase percentage was WX strain(86.58%) in sire line, and H strain(86.0%) in dam line. The average of carcase percentage was 85.64% in imported broiler stock. In the conclusion, the average performance of selected dam lines O and T strains were superior to the imported parents stock in the over all results of this experiment. A comparison of relative performance between selected superior female breeders and Arkansas meat performance egg phase test, there were no significant difference in terms of average performance in livability, egg weight, conversion of feed into eggs, sexual maturity and adult body weight. The broiler test represents the performance of the progeny from the matings between selected superior female lines and certain selected male lines. The average performance of selected certain broiler lines were about the same performance as the imported broiler strains and there was no significant differences between average performance selected domestic broiler lines and Arkansas meat performance test.