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Abstract

Data from 228 herds with low NR rates were analysed by computer. The percentage of herds in which low NR rate was attributed to the inseminator, the AI bull, the natural service bull and inaccuracy of oestrus detection was 91, 12, 25 and 6 resp. In 60% of herds, milk yield was considered to have...

Author(s)
O'Gorman, J.; Bourke, S.; Roche, J. F.
Publisher
University College Dublin, Dublin, Irish Republic
Citation
11th International Congress on Animal Reproduction and Artificial Insemination, University College Dublin, Ireland, June 26-30 1988. Volume 3. Brief communications., 1988, Paper No. 278, pp 3pp.
Abstract

In 463 cows from 5 herds, the interval from calving to the 1st increase in progesterone concentration of milk averaged 30.6±0.94 days, calving to 1st oestrus 55 days (residual standard deviation = 29 days), calving to 1st service 67±29 days, calving to conception 87±41 days, 1st-service CR 52%...

Author(s)
Fagan, J. G.; Roche, J. F.
Publisher
University College Dublin, Dublin, Irish Republic
Citation
11th International Congress on Animal Reproduction and Artificial Insemination, University College Dublin, Ireland, June 26-30 1988. Volume 2. Brief communications., 1988, Paper No. 28, pp 3pp.