• 한국동물위생학회지
• /
• 제33권1호
• /
• pp.81-87
• /
• 2010

This study was based on a survey of 100 sows which were raising in Jeonnam province for 11 months, from February to December 2008 in order to evaluate the medicinal herbs supplementation in sows on the effects of mortality in suckling pigs, and milk quality of sows. The medicinal herbs were supplemented in the feed of sows from 1 weeks before the expected date of delivery to 10 days after the delivery. As comparing stillbirth rate, test group was reduced 9.05%, and control group, 17.37%. It was certain that the medicinal herbs was very effective for reducing stillbirth rate. In comparison of mortality rate of suckling pig, test group was decreased by 1.52% as compared with control group. In analysis of milk components of sows, milk fat was 6.04% in test group and 5.22% in control group. Milk protein contents of test group and control group were 18.06% and 18.36%, respectively, showing no significant differences between two groups. Milk sugar contents showed also no difference between two groups. By milk somatic cell counts, test group ($582{\times}10^3$cells/ml) was found decreased number of milk somatic cell as compared with control group ($688{\times}10^3$cells/ml). These results imply that the medicinal herbs supplementation in sow might be effective for preventing stillbirth and mortality in piglets and mastitis in sow.

• Asian-Australasian Journal of Animal Sciences
• /
• 제25권1호
• /
• pp.22-27
• /
• 2012

The experiment involved observations of 2,514 Holstein-Friesian cows to determine the effects of environmental factors (cow's age, calving season, weight and sex of calves, housing system) and genetic factors on gestation length in dairy cattle and the correlation between gestation length and other reproductive traits (calving ease, stillbirth rates and placental expulsion). Genetic parameters were estimated based on the sires of calved cows (indirect effect) and the sires of live-born calves (direct effect). The following factors were found to contribute to prolonged gestation: increasing cow's age, male fetuses and growing fetus weight. Optimal gestation length was determined in the range of 275-277 days based on calving ease and stillbirth rates. The heritability of gestation length was estimated at 0.201-0.210 by the direct effect and 0.055-0.073 by the indirect effect. The resulting genetic correlations suggest that the efforts to optimize (prolong) gestation length could exert an adverse influence on the breeding value of bulls by increasing perinatal mortality and calving difficulty. The standard errors of the investigated parameters were relatively high, suggesting that any attempts to modify gestation length for the purpose of improving calving ease and reducing stillbirth rates should be introduced with great caution.

• 한국수정란이식학회지
• /
• 제32권3호
• /
• pp.171-176
• /
• 2017

본 연구는 한우 송아지 생산효율 향상을 위한 농가 번식 실태를 조사하였다. 한우 사육 규모별, 지역별로 나누어 45개 농가의 가임암소를 대상으로 조사를 실시하여 다음과 같은 결과를 얻었다. 한우의 최초 분만월령은 평균 28.7개월령이었다. 수태당 인공수정 횟수는 $1.45{\pm}0.32$회였으며, 분만 후 인공수정 일수는 119.8일이었다. 수태율은 소규모 농가가 $75.2{\pm}16.93%$로 중규모($70.6{\pm}17.46%$) 및 대규모 농가($71.4{\pm}11.03%$)보다 높은 것으로 나타났다. 번식률 상위 농가의 사육 방식을 보면, '발정관찰 보조기구를 사용하는 농가'가 '그렇지 않은 농가'보다 송아지 생산율이 10.42% 높았다. 번식소에 대해 IBR과 BVDV 예방접종을 실시한 농가는 유사산 폐사율이 4.41% 감소한 것으로 나타났다. 또한 농가여건에 따라 방목과 운동을 한 경우, 수태율과 분만율이 각각 3.47%, 18.29% 향상되는 것으로 나타났다. 본 조사 결과를 통해 발정관찰, 예방접종, 방목이 한우농가에서 송아지 생산 효율을 높이는데 중요한 지표로 나타났다. 한우 사육 농가의 번식실태 조사를 통해 농가 현장의 번식률 향상을 위한 연구 자료로 활용이 가능할 것이다.

• 한국발생생물학회:학술대회논문집
• /
• 한국발생생물학회 2001년도 발생공학 국제심포지움 및 학술대회 발표자료집
• /
• pp.37-43
• /
• 2001

1. About fifty thousand of cattle embryos were transferred and 16000 ET-calves were born in 1999. Eighty percents of embryos were collected from Japanese Black beef donors and transferred to dairy Holstein heifers and cows. Since 1985, we have achieved in bovine in vitro fertilization using immature oocytes collected from ovaries of slaughterhouse. Now over 8000 embryos fertilized by Japanese Black bull, as Kitaguni 7~8 or Mitsufuku, famousbulls as high marbling score of progeny tests were sold to dairy farmers and transferred to their dairy cattle every year. 2. Embryo splitting for identical twins is demonstrated an useful tool to supply a bull for semen collection and a steer for beef performance test. According to the data of Dr. Hashiyada(2001), 296 pairs of split-half embryos were transferred to recipients and 98 gave births of 112 calves (23 pairs of identical twins and 66 singletons). 3. A blastomere-nuclear-transferred cloned calf was born in 1990 by a joint research with Drs. Tsunoda, National Institute of Animal Industry (NIAI) and Ushijima, Chiba Prefectural Farm Animal Center. The fruits of this technology were applied to the production of a calf from a cell of long-term-cultured inner cell mass (1988, Itoh et al, ZEN-NOH Central Research Institute for Feed and Livestock) and a cloned calf from three-successive-cloning (1997, Tsunoda et al.). According to the survey of MAFF of Japan, over 500 calves were born until this year and a glaf of them were already brought to the market for beef. 4. After the report of "Dolly", in February 1997, the first somatic cell clone female calves were born in July 1998 as the fruits of the joint research organized by Dr. Tsunoda in Kinki University (Kato et al, 2000). The male calves were born in August and September 1998 by the collaboration with NIAI and Kagoshima Prefecture. Then 244 calves, four pigs and a kid of goat were now born in 36 institutes of Japan. 5. Somatic cell cloning in farm animal production will bring us as effective reproductive method of elite-dairy- cows, super-cows and excellent bulls. The effect of making copy farm animal is also related to the reservation of genetic resources and re-creation of a male bull from a castrated steer of excellent marbling beef. Cloning of genetically modified animals is most promising to making pig organs transplant to people and providing protein drugs in milk of pig, goat and cattle. 6. Farm animal cloning is one of the most dreamful technologies of 21th century. It is necessary to develop this technology more efficient and stable as realistic technology of the farm animal production. We are making researches related to the best condition of donor cells for high productivity of cloning, genetic analysis of cloned animals, growth and performance abilities of clone cattle and pathological and genetical analysis of high rates of abortion and stillbirth of clone calves (about 30% of periparutum mortality). 7. It is requested in the report of Ministry of Health, labor and Welfare to make clear that carbon-copy cattle(somatic cell clone cattle) are safe and heathy for a commercial market since the somatic cell cloning is a completely new technology. Fattened beef steers (well-proved normal growth) and milking cows(shown a good fertility) are now provided for the assessment of food safety.