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- 저자 : 오봉국 ( Seung W . Han (검색결과 1 건)
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난용종계의 란중증대성과 기지 형질의 유전력 및 상관관계에 관한 연구
한성욱,오봉국 ( Seung W . Han,Bong Kug Ohh ) 한국축산학회 1975 한국축산학회지 Vol.17 No.1
The present study was conducted to estimate the heritabilities and genetic correlations. among the egg weight increase in pullet year and certain other economic traits of egg production stocks and to obtain information useful for the genetic improvement of Korean laying stocks especially for the improvement of egg weight. The data used in this study were the records on 3,121 White Leghorn hens from three different strains, LD, LH ana DS which were raised from 1964 to 1968 at Han Hyup Poultry Breeding Farm in Seoul. The traits studied were average weight of first ten eggs, average egg weight to 400 days of age, average March egg weight, body weight at 8 weeks of age, number of eggs. to 300 days of age, number of eggs to 400 days of age, age at first egg, age at average egg weight, time interval from first egg to average egg weight, and winter pause. The results obtained are as follows. 1. In the averages of each traits computed for each strain, the average weight of first ten eggs was 42.5±5.2g for the DS strain, 42.4±4.8g for the LD strain, and 43.9±5.4g for the LH strain, respectively; the average egg weight to 400 days of age and that in March were 50.3 and 53.9g for the DS strain, 51.3 and 54.5g for the LB strain, and 52.7 and 55.8g for the LH strain; body weights at 8 weeks for the DS, LD and LH strains were 580.2, 595.6 and 606.3g, respectively; numbers of eggs to 300 and 400 days of age were 72 and 138 for the DS strain, 72 and 141 for the LD strain, and 65 and 132 for the LH strain; age at first egg was 179 days for the DS strain, 181 days for the LD strain, and 186 days for the LH strain, respectively; age at average egg weight in pullet year was 260 days for the DS strain, 261 days for the LD strain, and 265 days for the LH strain; time intervals from first egg to average egg weight were 81 days for the DS strain, 73 days for the LD strain, and 79 days fer the LH strain. The range of winter pause for the three strains was 13∼23 days. 2. The range of heritability estimates derived from the sire component of variance in the three strains were 0.20∼0.45 for average weight of first ten eggs, 0.15∼0.89 for March egg weight, 0.15∼0.66 for egg weight at 400 days of age, 0.24∼0.64 for body weight at 8 weeks, 0.10∼0.14 for number of eggs to 300 days, 0.09∼0.21 for number of eggs to 400 days, 0.13∼0.44 for age at first egg, -0.11∼0.10 for age at average egg weight, 0.14∼0.18 for time interval from first egg to average egg weight, and -0.07∼0.00 for winter pause. The heritabilities of age at average egg weight were very low and those of time interval from first egg to average egg weight were of intermediate value, suggesting that the latter trait would be more useful for the improvement of egg weight increase than age at average egg weight. 3. Positive values of maternal variance were estimated in all three strains for number of eggs to 300 days of age, number of eggs to 400 days of age, age at average egg weight, and for winter pause, although the magnitude of them were somewhat different depending on the strain. For egg weight, the maternal variance was consistantly recognized only in the DS strain. 4. The genetic correlation of average weight of first 10 eggs with number of eggs to 300 and 400 days of age was -0.48∼-0.59 and -0.39∼-0.76, respectively. The genetic correlation of the trait with average egg weights to 400 days of age and with average March egg weight was 0.23∼0.93 and 0.44∼0.85, respectively. The correlations between average of first 10 eggs and 8 weeks body weight were generally positive, but were very low. The genetic and phenotypic correlations of age at first egg with number of eggs to 300 days of age were -0.48∼-0.84. The phenotypic correlations of age at first egg with number of eggs to 400 days were negative and high. But there were considerable differences between the strains in the genetic correlations of the trait with number of eggs to 400 days of age. The genetic correlation
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