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Journal of Dairy Science Vol. 80 No. 6 1113-1118
© 1997 by American Dairy Science Association ®
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Evaluation of Selected Antibiotic Residue Screening Tests for Milk from Individual Goats

A. Contreras 1, M. J. Paape 2, A. L. Di Carlo 2, R. H. Miller 2, and P. Rainard 3

1 Enfermedades Infecciosas, Facultad de Veterinaria, Universidad de Murcia, 30071 Murcia, Spain
2 Livestock and Poultry Sciences Institute, ARS, USDA, Beltsville, MD 20705
3 Laboratoire de Pathologie Infectieuse et Immunologie, Insitut National de la Recherches Agronomique, Centre de Recherches de Tours, 37380 Nouzilly, France

Because somatic cell counts (SCC) of caprine milk are higher than SCC of bovine milk, the performance of antibiotic residue tests for screening bovine milk was investigated for caprine milk. Eighty-five does that were free of antibiotic usage for at least 30 d and that were free of clinical mastitis were sampled at three milkings during a 37-d period. At each sampling, foremilk was collected for bacteriological analysis, and composite bucket milk samples were collected for antibiotic testing and SCC. Day of lactation, parity, 305-d mature equivalent milk yield, and SCC averaged 221 d (57 to 577 d), 2.3 lactations (one to nine lactations), 1160 kg (623 to 1750 kg), and 2.2 x 106/ml (0.3 to 30.7 x 106/ml), respectively. The mean Dairy Herd Improvement Association test day milk yield for the month of sample collection was 3 kg (1.4 to 6.4 kg). Intramammary infections were present in 54% of the goats and in 36% of the udder halves. Assays included positive (5 and 10 ppb of penicillin-G and 50 ppb of ceftiofur) and negative controls that had been prepared in caprine milk and controls supplied by the manufacturers. One false-negative out-come and one false-positive outcome were recorded. For one sampling day, a positive linear relationship existed between SCC and the results of one test, and a quadratic relationship existed between SCC and the results of another test. The antibiotic residue screening tests for milk from individual goats adequately identified milk that was free of antibiotic. These tests are therefore recommended for use with caprine milk.

Key Words: dairy goats • antibiotic residue • screening tests • somatic cell count

Submitted on March 18, 1996
Accepted on September 30, 1996




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