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Perhaps the main conclusion from the results presented is the overwhelming importance of heterosis for profitability, resulting from cumulate effect of heterosis for most traits. Different regression coefficients were assumed for each management level M i , high or low to accommodate the management by genotype interaction. An essential feature of this trial was to have performance recorded under commercial management rather than at experimental stations, as the latter have bureaucratic problems which would make proper management difficult and they would not provide a realistic commercial environment. As a consequence, the estimates of the breed difference and heterosis b 1 and b 2 in model  were reduced in procedure a to 55 and 53 percent of the estimate under c , and in b to 89 and 83 percent. In the dry season the same trends were similar but not statistically significant Madalena et al a, Paiva et al
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In a country as large as Brazil, with many geographical differences and wide variation in income, several production systems will co-exist. Genetic gain in milk and component yield has been disappointingly low in Brazilian Holsteins. The number of embryos produced increased from ca. Invalid email address. Thus, the crossbred groups varied in their response to improved management, measured by the differential performance in the high and low management classes.
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The breed derives its name from the Gir forest, which is the natural habitat of the breed. Female calves had higher mortality than males during this stage. In an international AI firm announced that it would sell in Brazil embryos produced from H ovaries recovered from USA abattoirs fertilized with Gir semen, but this never materialized. Indian Veterinary Medical Journal 4: Number of lactations in herd life. Highest mortality was observed from birth to one month of age.