Ex) Article Title, Author, Keywords
pISSN 1598-298X
eISSN 2384-0749
Ex) Article Title, Author, Keywords
J Vet Clin 2017; 34(2): 82-86
https://doi.org/10.17555/jvc.2017.04.34.2.82
Published online April 30, 2017
Soo-Young Kim, Jae-Kwan Jeong, Soo-Chan Lee, Hyun-Gu Kang, Ill-Hwa Kim
Copyright © The Korean Society of Veterinary Clinics.
We determined the risk factors for late embryonic mortality in dairy cows. We diagnosed pregnancy at 31 days and then confirmed the diagnosis at 45 days after artificial insemination (AI) via ultrasonography. The presence of an embryo with a heartbeat was the criterion for a positive pregnancy diagnosis. A diagnosis of late embryonic mortality was made when there was no positive sign of pregnancy in cows previously diagnosed as pregnant. The overall incidence of late embryonic mortality among 3,695 pregnancies was 6.9%. Logistic regression analysis revealed that herd size, AI month, synchronization protocol, and postpartum disease were important risk factors for late embryonic mortality. Herd size > 100 (odds ratio [OR]: 0.66, p < 0.05) and 50-100 lactating cows (OR: 0.63, p < 0.01) had lower risks of late embryonic mortality than herd size < 50 lactating cows. Cows inseminated during May-July had a higher risk (OR: 1.49, p < 0.05) of late embryonic mortality than cows inseminated during February-April. Cows inseminated after estrus following
Keywords: dairy cows, late embryonic mortality, risk factors, ultrasonography
J Vet Clin 2017; 34(2): 82-86
Published online April 30, 2017 https://doi.org/10.17555/jvc.2017.04.34.2.82
Copyright © The Korean Society of Veterinary Clinics.
Soo-Young Kim, Jae-Kwan Jeong, Soo-Chan Lee, Hyun-Gu Kang, Ill-Hwa Kim
Veterinary Medical Center and College of Veterinary Medicine, Chungbuk National University
We determined the risk factors for late embryonic mortality in dairy cows. We diagnosed pregnancy at 31 days and then confirmed the diagnosis at 45 days after artificial insemination (AI) via ultrasonography. The presence of an embryo with a heartbeat was the criterion for a positive pregnancy diagnosis. A diagnosis of late embryonic mortality was made when there was no positive sign of pregnancy in cows previously diagnosed as pregnant. The overall incidence of late embryonic mortality among 3,695 pregnancies was 6.9%. Logistic regression analysis revealed that herd size, AI month, synchronization protocol, and postpartum disease were important risk factors for late embryonic mortality. Herd size > 100 (odds ratio [OR]: 0.66, p < 0.05) and 50-100 lactating cows (OR: 0.63, p < 0.01) had lower risks of late embryonic mortality than herd size < 50 lactating cows. Cows inseminated during May-July had a higher risk (OR: 1.49, p < 0.05) of late embryonic mortality than cows inseminated during February-April. Cows inseminated after estrus following
Keywords: dairy cows, late embryonic mortality, risk factors, ultrasonography