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KMID : 1094020140310050382
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Journal of Veterinary Clinics
2014 Volume.31 No. 5 p.382 ~ p.388
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Risk Factors for the Probability of Pregnancy Following Synchronization Protocols in Dairy Cows
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Jeong Jae-Kwan
Kang Hyun-Gu
Kim Ill-Hwa
Jung Young-Hun
Hur Tai-Young
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Abstract
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The objective of this study was to determine the risk factors associated with pregnancy following 3synchronization protocols in dairy cows. Data were collected on 1,952 cows from 22 dairy farms, includingsynchronization protocols (PGF2α + estradiol benzoate [PG+EB], Ovsynch, and CIDR-ovsynch), cow parity, bodycondition score (BCS), and dates of previous calving, insemination and conception. The odds ratio (OR) for pregnancywere analyzed by logistic regression using the LOGISTIC procedure in SAS. The analysis revealed that farm (p = 0.005),cow parity (p = 0.0001), BCS (p < 0.005), and AI season (p < 0.05) significantly affected and calving to AI intervaltended to affect (p < 0.1) the probability for pregnancy. Although synchronization protocols did not affect the probabilityfor pregnancy (p > 0.05), cow parity and synchronization protocols showed a significant interaction (p < 0.005); theOR (0.60) was significantly lower (p < 0.0001) for multiparous cows compared to primiparous cows using PG+EB,whereas the OR (1.44) tended to be higher (p < 0.1) for multiparous cows compared to primiparous cows using theOvsynch, and the probability for pregnancy did not differ between multiparous and primiparous cows using the CIDRovsynch(p > 0.05). Cows with BCS ≥ 3.00 were more likely pregnant (OR: 1.41) compared with cows havingBCS ≤ 2.75, whereas cows inseminated during summer had a lower OR (0.73) compared with those inseminated duringspring. Cows with a calving to AI interval > 150 days were more likely to be pregnant (OR: 1.20) compared withcows with a calving to AI interval ≤ 150 days. In conclusion, the OR for pregnancy following synchronization protocolsin dairy cows was affected by farm, parity, BCS, calving to AI interval of the cow, and AI season, and there wasa significant interaction between cow parity and synchronization protocols; the OR for pregnancy was lower formultiparous cows compared with primiparous cows using the PG+EB protocol.
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KEYWORD
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dairy cows, synchronization protocols, probability for pregnancy, risk factors
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