Effects of twice-daily nursing on milk ejection and milk yield during nursing and milking in dairy cows.

摘要: Milk production and hormonal responses to milking in Holstein cows that were milked twice daily, either also nursed calves daily 2 h after for 9 wk calving (n = 10) or served as nonnursing controls 8) examined assess how nursing affected machine milking. yield at during the of was lower compared with control (26.1 +/- 1.0 vs. 35.5 1.1 kg) only milked. During nursing, amount drunk by increased from 6.5 0.7 kg/d on 1 12.5 1.4 9. When this added milk obtained milking, did not differ total produced (35.5 kg). Residual yield, i.v. injection oxytocin higher than (8.7 0.8 3.2 6 weaning, same (34.0 1.35 34.7 1.42 Plasma levels greater (31.7 5.4 18.0 2.8 pg/mL), but equivalent concentrations 7.5 pg/mL). prolactin cortisol both (control nursing: prolactin: 40.2 6.8 32.9 6.1 ng/mL; cortisol: 6.4 1.23 7.4 1.10 ng/mL) 18.6 7.3 38.9 6.6 2.34 1.15 7.37 1.04 ng/mL). In contrast previous studies, there no obvious advantage keeping a calf cow. This appears result reduced secretion cows.