The dry periodâthe 6-8 weeks before calving when dairy cows are not being milkedâis a critical welfare window often overlooked in comparison to the lactation period. Proper dry period management directly affects cow welfare, transition health, and subsequent lactation performance.
Abrupt dry-off (cessation of milking) causes udder engorgement, elevated intra-mammary pressure, and discomfort that can persist for 3-7 days. High-yielding cows are at particular risk of post-dry-off mastitis and welfare-significant discomfort. Gradual dry-off methodsâreducing milking frequency over 1-2 weeks before cessation, or dietary restriction to reduce yield before dry-offâreduce welfare harm during this transition.
Blanket dry cow antibiotic therapy (treating all cows at dry-off) has been the standard approach for mastitis prevention, but antimicrobial stewardship concerns are driving a shift to selective dry cow therapy (treating only cows with evidence of infection). Welfare-optimal selective therapy requires: effective mastitis detection in late lactation, accurate identification of infected quarters, and appropriate treatment of infected animals.
Dry cows require space for elevated lying time (14-16 hours daily during late pregnancy), access to appropriate nutrition (dry cow rations differ substantially from lactating cow rations), social stability, and minimal stress. Mixing of dry cows in late pregnancy is a welfare riskâestablishing stable groups and minimizing regrouping reduces social stress during this vulnerable period.
Target BCS at dry-off of 3.0-3.5 is optimal. Over-conditioned cows (BCS >3.5) face increased metabolic disease risk post-calving; thin cows (BCS <2.5) have insufficient reserves for the transition period. Body condition management through the lactation period prevents dry-off extremes.
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