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The Impact of Lameness on the Fertility of Dairy Cattle in a Seasonally Breeding Pasture-Based System
R. Laven
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The impact of lameness on fertility was assessed in 452 cows on a standard spring‐ calving pasture‐based New Zealand farm. The breeding season of 12 weeks consisted of 6 weeks AI followed by 6 weeks of natural mating. Sixty‐eight cows became lame during the lactation under study. Peak lameness hazard was 2 cases per 100 cows per day. This occurred at 75 days in milk; lameness hazard decreased over the next month to 0.02 cases per 100 cows per day and remained static thereafter. Controlling for the effect of parity, liveweight at calving and interval from calving to planned start of mating, lame cows had a daily hazard of conception of 0.78 (95% CI 0.69 – 0.88) compared to their non‐lame counterparts ...
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