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Calving records were obtained from 1617 heifers in 26 herds which were part of the GenermateTM synchrony programme. Each heifer was fitted with a controlled internal drug-releasing (CIDR) device which released progesterone over a 10-day period. Oestradiol benzoate (10 mg) was given at the time of...

Cliff, S. C.; Morris, G. R.; Hook, I. S.; MacMillan, K. L.
Proceedings of the New Zealand Society of Animal Production, 1995, 55, pp 70-71