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Abstract
Milk production in the intertropical region has been based on the crossbreeding of Bos taurus taurus with Bos taurus indicus breeds, generating products of high hybrid vigor as the F1 mix breed with high productive-reproductive potential and resistance to the environment. The dairy productive performance and the reproductive performance of F1 Holstein x Brahman cows in a herd raised in warm climate in the municipality of Cartago, Valle del Cauca, Colombia were evaluated. Records for age at first calving (AFC, n=23), Calving Interval (CI, n=60), milk production per lactation (n=71) and lactation persistency (LP, n=67) in crossbreeding of Holstein bull with Brahman cows were evaluated; the cows were milked twice a day with calf support and supplementation per milking lot. The AFC was 31.3±4.12 months; the average of CI was 423.46±111.26 days; milk production average per lactation was 3052±785 kg, with a range between 540 and 3471 kg. The average LP was 54.22±17.59%, with persistency higher than 60% until the third lactation and lower than 40% after the seventh lactation. In conclusion the productive and reproductive performance in F1 Holstein x Brahman cows is optimum and superior compared to the Colombian double purpose cattle national parameters. F1 Holstein x Brahman cows are long lived reaching ages of 139 months (11.5 years) with eight (8) lactations, milk production per lactation higher than 3000 kg and persistency close to 40%. Nevertheless, this genetic potential is only shown under good nutritional management.
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