A survey of 291 dairy farms in Minas Gerais indicated that 89% of the cow population is hybrid Bos taurus/B. indicus. About half (47% ) of the farmers wish to keep their herd intermediate between those species and 40% do not have a definite goal on this respect. Because most farms keep just one bull (72%) and use natural service (79%), rotational crossing is not feasible, so farmers resort to switching the sire species or to using hybrid sires, both of which generate undesirable genotypes. Thus, continuous F] replacements schemes are justified to capitalise on heterosis. Research results, shown graphically, indicate superior economic performance of FiS in the prevailing production systems. Producers of Fi females for sale were identified by the State extension agency. There were 267 producers, with more t h a n 42,000 cows, which could supply replacements on the order of 1.5 % of the total needed for the 5 million milk cows in the State. A questionnaire answered by 68 Fj producers indicated that 27% sell all Fi females, 34% keep up to Vi of them for dairying and 39% keep more t h a n y2. Prices of Fi females were considerably higher than for other genotypes, indicating that buyers expect a higher profit from them. Almost all (99%) Fi producers intend to continue this activity, mainly because of profitability and easy marketing of females
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 199–202, 1998
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