Antibiotic residue release at the beginning of lactation following dry cow therapy

Authors: Hill BM, Small JM
Publication: New Zealand Veterinary Journal, Volume 33, Issue 7, pp 105-107, Jul 1985
Publisher: Taylor and Francis

Animal type: Cattle, Livestock, Production animal, Ruminant
Subject Terms: Animal remedies/veterinary medicines, Antibiotics, Treatment/therapy, Bacterial, Mastitis, Legal/regulation, Mammary gland/udder, Infectious disease, Milk, Residues
Article class: Scientific Article

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Abstract: In response to farmer complaints about unfair penalties, for the presence of inhibitory substances in early lactation following the use of dry-cow antibiotic therapy, a two-part study was carried out to try and establish why these unexplained grades occur. A survey of instructions supplied with each of 13 registered dry-cow products suggested that the directions for drug use were in some cases inappropriate for long-acting antibiotics. A residue release study was conducted at the beginning of lactation following antibiotic therapy at various times during the dry period. The results showed, for the-three dry-cow preparations studied, that treatment during the drv period, especially within six weeks of calving, could lead to detectable residues in milk from treated quarters.

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