Reproductive performance of Cuban Dairy Zebu and Dairy Crossbred Zebu heifers in the Genetic Cattle Enterprise ?Los Naranjos?
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Abstract
nested animal included in the fixed effect of the genotype (CDZ or DCZ), the incorporation age as linear co-variable and the fixed effects of incorporation year, unit and season, respectively (rainy or dry), as well as the interactions year-season, genotype-year and genotypeseason- year. In respect to the significant effects, the Tukey-Kramer test was applied for the multiple comparison of the minimum square means. The mean transformed values were: 70 ? 58 d, 215 ?179 d, 285 ?181 d, 3.2 ? 1.7 and 50 ? 8 months, for IFS, IPI, IIG, S/G and AFC, respectively. Only signification of the incorporation year and unit was obtained for all traits. The interaction year- incorporation season was only for IFS. No significant differences were obtained between genotypes for the analyzed reproductive traits. In general, it was proved that the intervals between incorporation and first calving were extremely high in these genotypes. Measures on the reproductive management and feeding should be taken to counteract this unfavorable situation.
Key words: Cuban dairy zebu, productive traits, heifers.
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