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VetMed Resource

Veterinary information to support practice, based on evidence and continuing education

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The objective was to determine factors controlling seasonal variation in 90-day non-return rate to first service (90-day NRR) including effects of location, milk yield, and weather variables on specific days before and after breeding. Dairy Herd Improvement Association records on first services...

Al-Katanani, Y. M.; Webb, D. W.; Hansen, P. J.
Journal of Dairy Science, 1999, 82, 12, pp 2611-2616