Effects of lameness, subclinical mastitis and loss of body condition on the reproductive performance of dairy cows

摘要: A total of 318 cows were monitored in the pre-breeding postpartum period for presence three production stressors: lameness, subclinical mastitis and body condition score (BCS) loss. For each stressor, given a classification severely, moderately or non-affected based on mobility scores, somatic cell counts BCS change. The number days from calving to onset first luteal phase was greater that had one severe stressor (median 44 days) two moderate stressors (41 compared with no (31 (P=0.02 P=0.04, respectively). More than increased interval further. There difference between 38 those none (P=0.13). delay significantly longer if occurred at time when resumption ovarian activity expected. these early lactation effect establishment next pregnancy inseminations required despite negative phase.