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A study on the age at 1st calving and length of calving interval in dairy-type Holstein-Friesian herds at Castrolanda, Parana State



A study on the age at 1st calving and length of calving interval in dairy-type Holstein-Friesian herds at Castrolanda, Parana State



Revista da Sociedade Brasileira de Zootecnia 12(4): 756-770



For 1521 Holstein-Friesian heifers in 29 herds in Brazil, age at 1st calving averaged 33.2+or-0.4 months, and the length of 2233 calving intervals averaged 416.2+or-9.5 days. From 1973 to 1978, there was a significant increase in the av. age at 1st calving from 32.4+or-0.07 to 33.8+or-0.5 months, and a significant decrease in the av. length of calving intervals from 450 to 362 days.

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