Reproductive performance of lactating dairy cows was studied using a prospective observational study of 29,462 cows in 168 commercial herds in 9 regions in Australia. There was substantial variation in all reproductive performance measures between herds, suggesting that important increases in reproductive performance would be possible in many commercial Australian herds if causal factors were identified and modified. Multivariable multilevel logistic models were used to study potential determinants for two measures of overall reproductive performance - pregnancy by week 6 after start of the mating period (mating start date or MSD) and non-pregnancy by week 21 after MSD, and for two components of overall reproductive performance - submission by week 3 after MSD and conception to first service.
| Identifer | oai:union.ndltd.org:ADTP/245290 |
| Creators | Morton, John |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
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