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Age at first calving and reproductive traits in the daughters of Brown Swiss and Holstein-Friesian bulls



Age at first calving and reproductive traits in the daughters of Brown Swiss and Holstein-Friesian bulls



Memoria, Asociacion Latinoamericana de Produccion Animal 16: 153



Data on 596 crossbred Brown Swiss (BS) and 400 crossbred Holstein-Friesian (HF) cows were analysed. In 1965-58, 1969-72, 1973-76 and 1977-80, age at 1st calving averaged 35.7+or-4.7, 33.7+or-6.7, 39.9+or-5.9 and 32.9+or-3.6 months resp. for BS crossbreds, and in the last 2 periods it averaged 34.7+or-5.0 and 30.8+or-4.0 months for HF crossbreds (P less than 0.01).

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