Association of days in close up, gestation length, and rumination around time of calving with disease and pregnancy outcomes in multiparous dairy cows

The purpose of this study was to evaluate the effect rumination times and days spent in a close-up group before calving (DCU) on early-lactation health reproductive outcomes dairy cows. Data were gathered for 719 cows located single herd. Herd management records analyzed receiving treatment first 30 d lactation (days milk; DIM) clinical mastitis, tract disease, ketosis, milk fever, displaced abomasum. Rumination each cow downloaded daily from herd's automated collar system used generate heat alerts beginning at 21 precalving until 14 postcalving. During DIM, 121 (18%) developed least 1 disease—any combination ketosis (40 cows, 5.9% total), mastitis (17 2.5%), metritis (75 11%), fever or abomasum (28 4.1%); 305 (45%) pregnant again 100 an additional 139 (20%) 150 DIM. Principal component analysis determine relationship between gestation length DCU their association with odds developing disease early lactation. We did not find any significant time within Higher week shown be strongly linked shorter subsequent pregnancy, whereas postcalving associated changes pregnancy. showed that curvilinear (principal 1) significantly incidence Gestation close up are important factors reducing lactation, around may help predict future outcomes.