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A study on lactation length in dairy-type Holstein-Friesian herds in Castrolanda, Parana State



A study on lactation length in dairy-type Holstein-Friesian herds in Castrolanda, Parana State



Revista da Sociedade Brasileira de Zootecnia 12(4): 741-755



In 1973-78, the length of 4490 lactations of purebred and crossbred Holstein-Friesian cows averaged 306.5+or-1.8 days. Year had a significant effect on lactation length, and cows calving in summer and autumn had longer lactations than those calving in winter (308.7+or-2.2 vs. 303.1+or-2.1 days). Lactation length varied significantly between herds, ranging from 272.0+or-24.4 to 329+or-3.8 days. It decreased significantly with increasing age of cow.

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Accession: 001156452

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