Abstract
The objective of the present study was to compare prospectively the milk and fat production, standardized to 305-day mature equivalent of bovine leukemia virus (BLV) naturally infected (89) and uninfected (104) cows. The animals were Holstein and Holstein x Chilean-Friesian, from a herd of the región Metropolitana, Chile, representing standard management for dairy cattle and with a known epidemiological condition related to BLV infection.BLV seropositive cows produced 6,501 ± 1,505 kg of milk and 168 ± 53 kg of fat (305-day, M.E), compared to 6,677 ± 1,728 of milk and 166 ± 46 kg of fat from seronegative cows. No statistical differences in milk and fat production were observed between the two groups of cows using variance analysis (P ≥ 0.05). No significant differences were also observed in milk and fat production, according to the number of lactations, between BLV seronegative and seropositive cows.
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