A large and almost significant effect of 2.05 (95% confidence interval: −0.03 to 4.12) kg milk/cow per day, was also found in the cows in the 4 th quartile of anti- O. ostertagi antibody level pre-treatment (ODR ≥0.72).
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Non-invasive indicators associated with the milk yield response after anthelmintic treatment at calving in dairy cows.
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