Records on 101 crossbred cows from the Dairy Research Unit of the Wakwa Animal and Veterinary Research Station were analysed to investigate fixed effects of genotype, parity, age of cow at calving, and season and year of birth of cows on lactation and reproductive performance. Traits analysed were: lactation milk yield (LMY), lactation length (LL), annualised milk production (AMP), calving interval (Cl), dry period (DP) and age at first calving (AFC). Effects of genotype and year influenced (P<0.01) LMY and AMP. Lactation length was favourably associated with LMY, AMP, DP and Cl. Effects of genotype and season affected AFC (PO.Ol). Parity and age of cow at calving only significantly affected DP and CL G1H1 tended to be consistently superior to G1M1 for most dairy and reproductive traits, suggesting that G1H1 may be better than G1M1 for milk production, while the latter may be better for dual-purpose (dairy-beef) production systems. G1M3 were not better than GMF2 in LMY and AMP, suggesting that inter se matings of Fi crosses, coupled with selection, may be recommended for production of synthetic dairy breeds
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programs; n, , 205–208, 1998
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