Relationships between herd bovine leukemia virus infection status and reproduction, disease incidence, and productivity in Swedish dairy herds
作者： Ulf Emanuelson , Krister Scherling , Hans Pettersson
DOI: 10.1016/0167-5877(92)90075-Q
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摘要: Abstract A program has been initiated in Sweden to eradicate bovine leukemia virus (BLV) infections dairy and beef cattle. As the first step, all herds were screened order identify those with BLV-infected animals. The objective of this study was ascertain possible relationships between herd BLV infection status measures describing disease incidence, reproduction production. determined 14 424 herds, using an enzyme-linked immunosorbent assay (ELISA) test applied bulk-milk samples. Relationships assessed logistic ordinary linear regression analyses. There many statistically significant associations production, but most low magnitude. risk for diseases infectious etiology seemed be greater among while non-infectious did not differ. culling rate higher milk production lower vs. BLV-free herds. effect on fertility only minor.
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