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RISS 인기검색어
- 검색키워드
- 저자 : 조윤연(C . Y . Cho) (검색결과 5 건)
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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.
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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.
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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.
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후산정체 (後産停滯) 가 번식효율과 산유량에 미치는 영향
정기화,조윤연,곽대오,박충생 ( K . H . Chung,Y . Y . Cho,D . O . Kwack,C . S . Park ) 한국축산학회 1991 한국축산학회지 Vol.33 No.7
To investigate the influence of retained placenta on the subsequent reproductive performance and milk yield, total 357 heads of Holstein dairy cows raised at N.A.B.I., Choong Nam province were used. The cows not expelled their placenta until 12 hours postparturient were termed as the cow of placenta retention. The days to first service. days open, services per conception, lactation days, peak yield per day. days to peak yield and 305 days ME milk yield were evaluated to determine the subsequent reproductive performances and milk yield, respectively. The mean incidence of retained placenta(RP) was 25.8% in a herd of 357 cows examined. The cows of placenta retention took significantly(P$lt;0.01) longer than normal cows in the days to first service and the days open, by 97.6±8.4 days and 192.6±15.0 days versus 79.3±2.3 days and 142.9+5.5 days respectively, but services per conception and days open more than 300 were not affected by retained placenta. In milk yield, lactation days, peak yield per day and days to peak yield were not affected by retained placenta, but milk yield per lactation was significantly(P$lt;0.05) decreased in RP cows with 5,684± 151.9㎏ versus 6,035±80.0㎏ for normal cows. From these results, there seemed to be negative relationship between incidence of retained placenta and subsequent reproductive performance and/or milk yied.
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살붙임 정도 , 분만난이도 및 분만계절이 젖소의 최고비유량과 최고비유량도달일수에 미치는 영향
안병석(B . S . Ahn),상병돈(B . D . Sang),윤문석(M . S . Yoon),전재원(J . W . Jeon),이현준(H . J . Lee),유충현(C . H . Yoo),조윤연(C . Y . Cho) 한국축산학회 1994 한국축산학회지 Vol.36 No.2
To determine the effects of body conditioning score (BCS), calving difficulty (CD) and calving season (FS) on days of peak milk yield (DPM) and peak milk production (PM), the Lactation records of 160 cows in the National Animal Breeding Institute during 1993 were analyzed. Calving season was found to be a significant (p$lt;0.05) influence on peak milk production and days of peak milk yield. DPM was longest for the spring calving season (March to May), but it was shorter for the winter (December to February), summer (June to August) and fall (September to November) calving seasons (in that order). PM was highest in the winter, but showed decreasing values in the spring, summer and fall. CD did not significantly effect DPM and PM, but there was no unitorm tendency shown. BCS did not significantly effect DPM (p$lt;0.05). Cows having a body conditioning score below 3.25 had higher milk yields than those scoring over 3.25.
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