산란계 개량에 관한 연구 1 . 순계의 생산능력 비교시험

상병찬,강만석,김동곤,한성욱 ( B . C . Sang,M . S . Kang,D . K . Kim,S . W . Han ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5

This experiment was carried out to test performance of the domentic purebred fowl. The purpose of this experiment was to compare the productive performance of the purebred fowl to obtained basic materials for laying performance improvement by means of cross breeding. In this study, 1, 200 chickens was used-that is 6 purebred strains White Leghorns(720 chickens), 1 purebred strain Rhode Island Reds (120 chickens), 1 purebred strain New Hampshires (120 chickens). The results obtained in this study are as follows; 1. The average Viability of brooding, rearing and laying period was best for Rhode Island Reds and E. Strain among White Leghorns. 2. The average body weight at 8 weeks, first egg production days, 500days of age in W. L. was 546.86g. 1431.37g, 1738.34g, respectively, but there was no significant difference among. purebred strains of W. L. 3. The average Sexual maturity of 50% egg production was 170.58 days in W. L., but R. I. R. and S. N. H. were 189.94 days, 182.42days, respectively. There was significant difference at 1 % level among Strains. 4. The average hen-housed egg production was 214.16 eggs in W. L., but R. I. R. and S. N. H. were 214.22 eggs, 196.74 eggs, respectively. There was significant difference at 1% level among Strains, but the highest hen-housed egg production (231.84 eggs) was E. Strain among strains. 5. The average egg weight was 54. 48g in W. L, but R. I. R. and .S. N. H. were 56.12g, 54.90g, respectively, The highest egg weight (57.69g) was Coronial Strain of W. L. among strains. There was significant difference at 1 % Level among strains. 6. The average feed requirement was 3.01 in W. L. but R. I. R. and S. N. H. were 3.23, 3.52, respectively the highest feed requirement (2.79) was Coronial Strain of W. L. among strains. There was significant difference at 1 % level among strains. 7. On the basis of the results of this study, the productive performance was best for C. D. E. strains among W. L. and R. I. R.

돼지의 번식형질에 미치는 품종 및 환경의 효과

상병찬,강만석,박종대 ( B . C . Sang,M . S . Kang,G . D . Park ) 한국축산학회 1988 한국축산학회지 Vol.30 No.10

This study was conducted to determine the main effects of the breed, furrowing year, season and parity on gestation length, litter size and litter weight at birth, 21 days and 56 days in swine. The least square means were estimated on the basis of the data obtained from 1,551 litters of Landrace, Large Yorkshire, Hampshire and Duroc breeds raised at National Animal Breeding Institute from 1981 to 1985. The results are summarized as follows; 1 The breed mean of the gestation length was 115.28 days, and effects of breed. furrowing year, season and parity were nonsignificant. 2. The effects of breed, furrowing year, season and parity for litter size at birth were highly significant at 1% level, and Large Yorkshire breed was superior for litter size at birth than the other breeds. 3. The effects of breed, furrowing year, season and parity for litter size on suckling, 21 days and 56 days were highly significant at 1% level, and Landrace breed was superior for pig weight at birth, 21 days and 56 days than the other breeds. 4. The effects of breed, furrowing year, season and parity for pig weight on birth, 21 days and 56 clays were highly significant at 1% level, and Landrace breed was superior for pig weight at birth, 21 days and 56 days than the other breed. 5. The effects of breed, furrowing year, season and parity for litter weight on birth, 21 days and 56 days were highly significant at 1% level, and the litter size at birth, 21 days and 56 days were superior in Landrace, in spring and in 3rd parity.

육성기사료의 양적제한급여가 겸용종계의 생산성에 미치는 영향

상병찬,강만석,김동곤,한성욱 ( B . C . Sang,M . S . Kang,D . K . Kim,S . W . Han ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5

The effect of feed restriction during the rearing Period on the reproductive Performance was studied using 400 birds of dual purpose breeder pullet (Rhode Island Reds). During the rearing period (7∼21 week of age) feed was affered 80%, 70%, 60% of feed consumption of full feed group, All groups were full feed during laying period after 21 week of age. The results abtained are summarized as follows ; 1. Viability was not significantly affected by the feed restriction in either the rearing period or laying period of the experiment. 2. Body weight of 60% restricted group at 22 weeks of age was 75% of control group. At 72 weeks of age it was 95% of that of full feed group and not yet recovered completely. 3. Feed consumption of restricted groups from 22 to 72 weeks of age was some what more than that of control group, but total feed consumption per hen of all age was significantly different according to the feed restriction. 4. The degree of sexual maturity as measured by age at 50% egg Production was delayed from 9 to 27 days compared to control group according to the restricted intensity during rearing period. 5. Hen-day egg production (22-72 weeks of age) was range from 67.23 to 68.79% among treatment. There was not significant difference among treatment. 6. Average hen-housed egg production over 53g per bird to the end of the experiment was 154.2 eggs for control and 159.7 eggs for 80%, 157.4 eggs for 70%, 166.9 eggs for 60% restricted group. There was significant difference at 5 % level among treatment. 7. Average egg weight was significantly increased in restricted groups relative to control. The difference between restricted groups and control was highly significant average egg weight. 8. In the economic analysis, feed cost for 1 hatchable egg (over 53g) was in the highest with the control group and was decreased as the degree of feed restricted intensity. On the basis of the results of this study, it was suggested that in dual purpose breeder the feed restriction should be fed 60% of control group during the rearing period (7-21 weeks of age) and the body weight at 22 weeks of age should be kept at the level of 75 of the control in other to get better performance during the laying period.

돼지 수정란 이식에 관한 연구 1 . 발정동기화 및 과배란유기

손동수(D . S . Son),이광원(K . W . Lee),최진성(J . S . Choi),김경남(K . N . Kim),강만석(M . S . Kang),지설하(S . H . Chee),박창식(C . S . Park) 한국축산학회 1987 한국축산학회지 Vol.29 No.12

This study was carried out to investigate the effect of synchronization of estrus and induction of superovulation after administration of altrenogest, PMSG and HCG in the multiparous sows weaned at 50-56 days. A total of 100% of the treated sows exhibited estrus within a four-day period. The average number of ovulation points per sow among superovulated breeds such as Landrace, Large White, Duroc and Hampshire was between 17.6 and 24.0.

빈우의 체위 및 체중이 독우의 체중에 미치는 영향

안병석(B . S . Ahn),김내수(N . S . Kim),정기화(K . H . Chung),오대균(D . K . Oh),강만석(M . S . Kang) 한국축산학회 1990 한국축산학회지 Vol.32 No.5

This study was carried out to determine the effects of body measurements and weights of dams on calves body weights in Korean native cattle raised at National Animal Breeding Institute from 1981 to 1988. The data obtained from the records for 194 heads of cows and 185 heads of calves. For calf body weight at birth, the effect of dam parity on male calf was significant at 1% level. The effect for calf weight at 3 months was not significant, but the effect for calf weight at weaning was significant at 1% level on the female and the male. On the phenotypic correlations of body weights and measurements of dams on calves weights at birth the body weight of the female on 3rd parity were positively correlated with chest width, hip width and thurl width of dam. On the Ist parity, body weight of the male at 3 month were positively correlated with widthers height, chest girth, chest widths, hip width, thurl width, body weight of dam. But those of weaning weights of calves with body measurements and weights of dam did not showed uniform trend.

돼지의 이유 후 형질에 대한 유전력 및 유전상관 추정

상병찬,안병석,박무균,박태진,강만석,이정규,지설하 ( B . C . Sang,B . S . Ann,M . K . Park,T . J . Park,M . S . Kang,J . G . Lee,S . H . Chee ) 한국축산학회 1985 한국축산학회지 Vol.27 No.6

This study was conducted to estimate the heritabilities and genetic correlations among postweaning traits in swine. The heritabilities estimated were 0.270 for daily gain, 0.350 for feed requirement, 0.272 for backfat thickness, 0.887 for days to 90㎏ and 0.565 for selection index. The genetic correlations of daily gain with feed requirement, backfat thickness, days to 90㎏ and selection index were -0.552, 0.107, -0.903, 0.716, and feed requirement with backfat thickness, days to 90㎏ and selection index were -0.058, 0.099, -0.942, and backfat thickness with days to 90㎏ and selection index were -0.237, -0.025, respectively.

돼지에 있어서 이유전 형질과 이유후 형질에 대한 유전모수 추정

이학교,최진성,김인철,박종대,강만석 ( H . K . Lee,J . S . Choi,I . C . Kim,J . D . Park,M . S . Kang ) 한국축산학회 1989 한국축산학회지 Vol.31 No.4

This study involved the records of 389 heads of Duroc, Hampshire, Large Yorkshire and Landrace boars tested at National Breeding Institute from 1980 to 1987. The Purpose of this analysis was to investigate the relationship between preweaning traits and postweaning traits. Preweaning and postweaning traits studied were; the number of live pigs in the litter in which the boar was born(LSBNA) and weaned(LSWN); his birth weight (BW), weight at 21days of age(GW21D), Weaning weight(WW56D); average daily gain(ADG), backfat thickness (BFT), feed Requirement(F/R), the days to 90㎏(90DAYS), IOWA-INDEX(INDEX). The heritabilities and genetic and phenotypic correlations were estimated from the sire components of variance and covariance. 1. Heritabilities estimated were 0.521±0.188(ADG), 0.219±0.169(F/E), 0.459±0.181(BFT), 0.91±0.215(90 DAYS), 0.337±0.173(INDEX), 0.371±0.312(LSBNA), 0.261± 0.191(LSWN), 0.174±0.153(BW), 0.208±0.157(GW21D) and 0.268±0.163(WW56D), respectively. 2. Genetic correlation of performance index (INDEX) with (BW), (GW21D), and (WW56D) were 0.326, 0.460 and 0.169, respectively, Phenotypic correlation of (INDEX) with (BW), (GW21D) and (WW56D) were 0.145, 0.065 and 0.076, respectively. Genetically (BW), (GW21D) and (WW56D) of the preweaning traits tended to show positive relationship with postweaning traits. These result indicated that the better growth rate at early stage tended to have a better performance.

토끼에 있어서 번식능력에 영향을 미치는 품종및 환경요인에 관한 연구

이학교(H . K . Lee),류충현(C . H . Ryu),최진성(J . S . Choi),강만석(M . S. Kang) 한국축산학회 1988 한국축산학회지 Vol.30 No.12

This study was conducted to estimate the effect of breed. year of kindling, season of kindling and month of age at kindling on the reproductivity in does. The data used in this study were obtained from total 4,024 litters of New zealand white (2,302 litters) and Californian (1,722 litters) raised at the Animal Breeding Institute from 1978 to 1986. The results obtained are summarized as follows: l. Significant (P$lt;0.05) differences were detected for born number, litter size at 21-day and at weaning among the breeds, kindling seasons and years, respectively. Except for growth rate from birth to 21 days of age, linear regression for month of age at kindling affected litter size and growth rate significantly (P$lt;0.01). 2. Breeds affected kitling weight at 21-day and at weaning significantly (P$lt;0.01). Years and seasons affected litter weight at 21-day and at weaning significantly (P$lt;0.01). 3. Breeds affected gestation length significantly (P$lt;0.01). The gestation length least-square means were 31.2±0. 18 and 31.8±0.27 in New zealand, Californian breed, respectively. Breed and season affected within-litter uniformity significantly (P$lt;0.01). Least-square means of within-litter uniformity over all litters studied was 12.0+1.12%.