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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.11
- 수록면
- 1,265 - 1,274 (10page)
- DOI
- 10.5187/jast.2021.e122
이용수
초록· 키워드
오류제보하기
Two field experiments were conducted to improve the conception rate of Hanwoo cow. The first experiment aimed to investigate the physiological condition of Hanwoo cows on estrus, including metabolic profiles and body condition score (BCS). The second experiment investigated the effect of a novel estrus detector on the artificial insemination (AI) conception rate for Hanwoo cows. For the first experiment, 80 Hanwoo cows (2.5 ± 0.10 of parity), approximately one month before estrus, were housed in 16 pens and offered the experimental diets twice daily with free water access. The BCS were recorded, and blood was collected from the jugular veins just before AI. The collected blood was used to measure physiological conditions, such as metabolite and hormone levels. For the second experiment, each cow was equipped with a neck-mounted estrus detector collar, which had a sensor connected through the internet. Approximately one month before estrus, three hundred sixty Hanwoo cows (2.4 ± 0.21 of parity) were assigned into groups with or without W-Tag collar treatments. The animals were managed the same as in the first experiment. The pregnancy rate reached 55% in the first experiment. The concentration of luteinizing hormone (LH) was higher (p < 0.012; 1.56 vs. 1.08 ng/mL) in cows that were not pregnant (NPG) than in cows that were pregnant (PG) after AI. The BCS and other concentrations of metabolites and hormones in the blood were not different in both NPG and PG cows. The ranges of estrogen, LH, and follicle-stimulating hormone for PG cows were 11.9 to 39.0 pg/mL, < 0.25 to 1.98 ng/mL, and < 0.50 to 0.82 ng/ mL, respectively. In the second experiment, cows with the estrus detector had lower days open (p < 0.001; 78.1 vs. 84.8 d), insemination frequency (p < 0.001; 1.26 vs. 2.52), and return of estrus (p < 0.001; 70.9 vs. 79.1 d) than those in cows without the estrus detector. In conclusion, the present study indicated that lower LH concentration just before AI potentially increased the pregnancy rate of Hanwoo cows. Furthermore, the application of estrus detectors to Hanwoo cows could improve the conception success rate for AI.
목차
등록된 정보가 없습니다.
참고문헌 (25)
참고문헌 신청
Lee JH / 2018 / Recent Hanwoo market condition / GSnJ Focus 258:1~16
R.H. Foote / 1975 / Estrus Detection and Estrus Detection Aids / Journal of Dairy Science 58(2):248~256
P.M. Fricke / 2014 / Expression and detection of estrus in dairy cows: the role of new technologies / Animal 8:134~143
S.R. Pecsok / 1994 / Conception Rates. 1. Derivation and Estimates for Effects of Estrus Detection on Cow Profitability / Journal of Dairy Science 77(10):3008~3015
G. C. Lamb / 2010 / Control of the estrous cycle to improve fertility for fixed-time artificial insemination in beef cattle: A review1 / Journal of Animal Science 88(suppl_13):E181~E192
R.H. Foote / 1975 / Estrus Detection and Estrus Detection Aids / Journal of Dairy Science 58(2):248~256
P.M. Fricke / 2014 / Expression and detection of estrus in dairy cows: the role of new technologies / Animal 8:134~143
S.R. Pecsok / 1994 / Conception Rates. 1. Derivation and Estimates for Effects of Estrus Detection on Cow Profitability / Journal of Dairy Science 77(10):3008~3015
G. C. Lamb / 2010 / Control of the estrous cycle to improve fertility for fixed-time artificial insemination in beef cattle: A review1 / Journal of Animal Science 88(suppl_13):E181~E192
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