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Effect of eprinomectin treatment on milk yield and quality in dairy cows in South Tyrol, Italy
  1. M. Reist, DrMedVet, DrScNat, PhD1,
  2. A. B. Forbes, BVM&S, PhD, CBiol, MSB, DipEVPC, MRCVS2,
  3. M. Bonfanti, DVM, PhD3,
  4. W. Beretta, DVM4 and
  5. K. Pfister, DrMedVet, DipEVPC1
  1. Institute of Comparative Tropical Medicine and Parasitology, Ludwig Maximilians University Munich, Leopoldstrasse 5, 80802 Munich, Germany
  2. Merial, 29 Avenue Tony Garnier, 69007 Lyon, France
  3. Merial Italia, Milanofiori, Strada 6 Palazzo E/5, 20090 Assago (MI), Italy
  4. Via Panider 16, 39020 Castelrotto (BZ), Italy
  1. E-mail for correspondence martin.reist{at}

The effect of treatment with eprinomectin on milk yield, milk composition and somatic cell counts (SCCs) was studied in 105 dairy cows located on seven farms in South Tyrol, Italy. On each farm, half of the animals were treated with eprinomectin and the other half were used as an untreated control group. Three test day records per animal were obtained before treatment (days −117, −75 and −33) and another three test day records were obtained after treatment (days 22, 62 and 131). Test day records comprised milk yield, milk composition, SCC and days in milk. On the day of treatment, blood samples and faecal samples were taken for parasitological analysis. Cows with positive faecal egg counts yielded less milk. A significant effect of eprinomectin on milk yield was observed after treatment and was most pronounced on the second and the third test days after treatment (+1.90 kg [P=0.002] and +2.63 kg [P<0.001], respectively). Furthermore, a significant decrease in SCC was observed on the second test day after treatment.

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