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Some factors affecting production and reproduction in 5/8 Holstein, 5/8 Brown Swiss and 5/ 8 Brahman heifers



Some factors affecting production and reproduction in 5/8 Holstein, 5/8 Brown Swiss and 5/ 8 Brahman heifers



VI Congreso Venezolano de Zootecnia 20 al 24 de Noviembre de 1990, San Cristobal, Venezuela: GR-37



Data on 55 first lactations were analysed. There were significant breed-type differences in daily milk yield (11. 0+or-1.8, 10.1+or-2.1 and 8.4+or-1.6 kg for Holstein, Brown Swiss and Brahman crossbreds resp.) and total lactation milk yield (3799+or-1334, 1604+or-1245 and 2514+or-896 kg), but reproductive performance was not significantly affected by breed type. Age at 1st calving had no significant effect on subsequent female fertility or dairy performance.

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