한우비육에 관한 연구;한국 빈우의 연령과 비육기간이 비육효과에 미치는 영향

조윤연,육종융,송계원,설동섭,정수영,연시중 한국축산학회 1966 한국축산학회지 Vol.8 No.1

This experiment was conducted to study the effects of age and periods on the fattening of Korean native cattle. Thirty-six herds of non-pregnant cows were alloted into 12 treatments combined with three levels of age (1.5 to 2, 4 to 5 and 8 to 10 years) and four levels of fattening periods (60, 90, 120 and 150 days). The results obtained are summarized as follows; 1. In daily gain a significant difference (p$lt;0.05) was observed among levels of age but there was no significant difference among levels of fattening period. Sixty-day period was the most effective fattening period for the 1.5 to 2 years old cow with its daily gain 0.92 ㎏ and 90-day period was the most effective fattening period for the 4 to 5 and 8 to 10 years old cow with their body gain 0.84 and 0.69 ㎏. 2. Significant (p$lt;0.01) difference in feed efficiency was observed with age and fattening period. In other words older cows required more feeds for 1 ㎏ gain. In This trial age affected highly significantly (p$lt;0.01) the amounts of DCP and TDN required and fattening period was also significantly (p$lt;0.05) affected the only the amount of TDN required for 1 ㎏ gain. 3. There was highly significant (p$lt;0.01) difference in the dressing percentage and marbling degree among fattening period. Dressing percentage was not affected by age, but marbling degree was affected significantly. Longer fattening period showed higher dressing percentage and marbling degree. 4. 1.5 to 2 years old cow fattened for 60 days showed highest net income with 102.22 won daily. Average daily net income of 4 to 5 years old cow with 90 days fattening and 8 to 10 years old cow with 60 days fattening was 49.49 won and 41.15 won. It showed that more net income could he induced with short period of fattening.

젖소의 비유능력 측정

조윤연 한국낙농육우협회 1984 낙농·육우 Vol.33 No.-

한우의 생시 및 이유시체중의 반복력

조윤연,이진희,박영일 한국축산학회 1969 한국축산학회지 Vol.11 No.2

Repeatabilities of birth and weaning weights of Korean Native Cattle were estimated based on the data from 240 calves raised at the Whasan Branch of the Livestock Experiment Station from 1957 through 1968. The birth weight was adjusted for differences in age of dam, year-season of birth, and sex. The weaning weight was adjusted for differences in age of dam, year-season of birth, sex, inbreeding of calf, and inbreeding of dam. Repeatabilities estimated were 0.23±0.07 for birth weight and 0.23±0.07 for weaning weight at 5 months of age. Phenotypic correlation between the two traits was 0.33±0.07.

분만우의 관리요령

조윤연 한국낙농육우협회 1985 낙농·육우 Vol.48 No.-

근친교배가 한우의 생시 및 이유시체중에 미치는 영향

조윤연,이진희,박영일 한국축산학회 1969 한국축산학회지 Vol.11 No.1

The data from 240 heads of Korean, Native Cattle raised at the Whasan Branch of the Livestock Experiment Station from 1951 through 1968 were analyzed by the least square methods to study the effect on birth and weaning weights of inbreeding of calf, inbreeding of dam, sex of calf, age of dam, and year-season of birth. The inbreeding of calf ranged from zero to 31% and averaged 5.8%. The inbreeding of dam ranged from zero to 31% and averaged 2.0%. The partial regressions were -0.042±0.030 ㎏. of birth weight and -0.292±0.153 ㎏. of weaning weight for each increase of 1% in inbreeding of calf. The partial regressions of birth and weaning weights on inbreeding of darn were 0.005±0.037 and -0.421±0.188 ㎏., respectively. The male calves were heavier than the females by 1.26 ㎏. at birth anal by 5.14 ㎏ at weaning at 5 months of age. The birth and weaning weights of calf from young dam tended to be smaller than the from the mature dam.

젖소의 비유능력 측정

조윤연 한국낙농육우협회 1984 낙농·육우 Vol.34 No.-

Holstein 종 유우의 산유형질에 대한 유전력과 유전상관 추정에 관한 연구

상병찬,조윤연,지병천 ( B . C . Sang,Y . Y . Cho,B . C . Chee ) 한국축산학회 1986 한국축산학회지 Vol.28 No.4

This study was conducted to estimate the heritabilities, genetic and phenotypic correlations among milk production traits on the basis of 1954 records from 522 Hostein cows produced from 54 sires at National Animal Breeding Institute from 1970 to 1981. The results obtained in this study are summarized as follows: 1. Total milk yield, 305 day milk yield, milk fat yield, fat percentage, peak yield, lactation period and days of peak yield were 4,699.49±1,467.41㎏, 4,940.58±1,221.98㎏, 179.24±17.68㎏, 3.57±0.34%, 24.44±5.77㎏, 301.44±71.97 days and 44.03±29.33 days, respectively. 2. The heritability estimates were 0.228±0.064 for total milk yield, 0.272±0.072 for correction milk yield, 0.236±0.066 for milk fat yield, 0.383±0.089 for fat percentage, 0.181±0.056 for peak yield, 0.104±0.042 for lactation period and 0.203±0.060 for days at peak yield. 3. The estimate of genetic correlation between 305 day milk yield and milk fat yield, fat percentage, peak yield, lactation period and days at peak yield were 0.902,-0.087,-0.030, 0.301, 0.013, respectively. And genetic correlation coefficients between milk fat yield and fat percentage, peak yield, lactation period and days at peak yield were 0.586,-0.222, 0.379 and 0.014, respectively.

유우의 임신기간 및 생시체중의 반복력과 이들 형질에 미치는 환경효과

상병찬,조윤연,김광종 ( B . C . Sang,Y . Y . Cho,K . K . Kim ) 한국축산학회 1986 한국축산학회지 Vol.28 No.4

This study was conducted to investigate the effects of year, calving season and parity on the gestation length and birth weight and the repeatability of these traits with the records of 1,954 from 522 Holstein cows at National Animal Breeding Institute from 1970 to 1981. The results obtained are summarized as follows; 1. The average gestation length was 279.374±0.859 days, and year and calving season had significant effect (P$lt;0.01) on gestation length. Gestation length of cows calved in summer was shortest and that of cows calved in winter was longest. 2. The average birth weight was 40.602±0.277㎏, and year, calving season and parity has significant effect (P$lt;0.01). The birth weight of calves from heifers was lightest and that of calves from cows with 4th parity was heaviest. 3. The repeatability estimates for gestation length and birth weight were 0.775±0.021 and 0.168±0.017, respectively.

도입한 돼지동결정액의 정자활동과 번식능력

지설하,조윤연,임경순,박태진,상병찬,김호중,김인철,노진식 한국축산학회 1984 한국축산학회지 Vol.26 No.8

This experiment was carried out to examine the effects of the imported boar frozen semen on the motility of the spermatozoa and reproductive performance. The fertility and reproductive performance were obtained on the basis of the 48 heads of Landrace, Hampshire, Large Yorkshire and Duroc sows inseminated with 96 tube boar frozen semen at National Animal Breeding Institute from 1983 to 1984. The results obtained are summarized as follows: 1. The average livability and motility of the spermatozoa were 54.3% and 24.8^(+++) after thawed of boar frozen semen, and Landrace was superior with 56.3% and 27.3^(+++), respectively. 2. The average gestation length was 114.3 days, and was shorter with 113.5 days in Hampshire. The conception and parturition rate were 16.7 and 12.5% with pregnancy and parturition of 8 and 6 heads of the 48 sows inseminated with frozen-thawed semen, respectively. And the conception rate was higher with 25.0% in Hampshire, and the parturition rate was superior with 16.7% in Hampshire and Large Yorkshire. 3. Average litter size at birth, 21 days and weaning were 7.7, 6.7 and 6.5 heads and Hampshire was higher with 11.5, 9.5 and 9.5 heads, respectively. 4. Average pig weight at birth, 21 days and weaning were 1.20, 5.45 and 19.25 Kg and Duroc was heavier with 1.39, 6.07 and 21.60 Kg, respectively.

Holstein 종 유우의 유량 , 유지량 , 유지율 및 최고유량에 미치는 유전 및 환경적 효과와 상호작용에 관한 연구

상병찬,조윤연,김호중 ( B . C . Sang,Y . Y . Cho,H . J . Kim ) 한국축산학회 1986 한국축산학회지 Vol.28 No.3

This study was conducted to determine the main effects and interactions of year, season, parity, performance of milk production and lactation period on daily average milk yield, fat yield, fat percentage and peak yield with the 2,811 records of Holstein cows at National Animal Breeding Institute from 1970 to 1981. The results obtained in this study are summarized as follows: 1. The daily milk yield, fat yield, fat percentage and peak yield were 14.85±.06㎏, 0.55±.002㎏, 3.59±.008% and 23.96±.11㎏, respectively. 2. The fat yield and fat percentage were no significant among season, but daily milk yield and peak yield were significant (p$lt;0.05) difference in the effects of season. 3. The daily milk yield, fat yield, fat percentage and peak yield were significant (p$lt;0.05) difference among parity, and the daily milk yield, fat yield were superior in the group of 5-9th parity than other parity groups. 4. The daily milk yield, fat yield and peak yield were significant (p$lt;0.05) difference, but daily fat percentage was no significant difference among the effects of performance of milk production. 5. The daily milk yield and fat yield were significant (p$lt;0.05) difference among lactation period, but fat percentage and peak yield were no significant difference. 6. The interaction effects of season by performance of milk production, and parity by performance of milk production were highly significant (p$lt;0.01) difference for the daily yield, fat yield and peak yield, and the interaction effects of parity by lactation period, and performance of milk production by lactation period were significant (p$lt;0.05) difference for the daily milk yield.