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In the first of 2 trials with Friesian crossbred cows in New Zealand, fortnightly drenching with tetramisole (114 ml/head), starting about 9 weeks after calving, increased milkfat yield/cow by almost 10 kg in the last 6 months of lactation. In the 2nd trial in which drenching with levamisole (55...

McQueen, I. P. M.; Cottier, K.; Hewitt, S. R.; Wright, D. F.
New Zealand Journal of Experimental Agriculture, 1977, 5, 2, pp 115-119