Document Detail  Field Investigation of Whether Corpus Luteum
Formation During Weeks 3-5 Postpartum is Related to Subsequent
Reproductive Performance of Dairy Cows. MedLine Citation: PMID: 
22785218     Owner:  NLM     Status:  Publisher     This study
analyzed the effect of corpus luteum (CL) formation during weeks
3-5 postpartum on the subsequent reproductive performance of
dairy cows. Factors contributing to CL formation during the
postpartum period were also determined. Data were collected from
1524 Holstein dairy cows on 18 farms using a single
ultrasonographic examination to determine the presence or
absence of a CL during weeks 3-5 postpartum. The dates of
calving, AI, conception and cow parity were also collected. Data
were acquired for a subset of 475 cows on five farms related to
peripartum reproductive events and the body condition score
(BCS) during weeks 3-5 postpartum. The hazard of first
postpartum insemination by 150 days in milk (DIM) was higher for
cows with a CL compared with herd mates wit