The Impact of Selective Dry Cow Therapy Adopted in a Brazilian Farm on Bacterial Diversity and the Abundance of Quarter Milk.

Autor: Goncalves JL; Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo (USP), Pirassununga, São Paulo 13635-900, Brazil.; Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University (MSU), East Lansing, MI 48864, USA., Young J; Department of Bacteriology, University of Wisconsin-Madison (UW), Madison, WI 53706, USA., Leite RF; Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo (USP), Pirassununga, São Paulo 13635-900, Brazil., Fidelis CE; Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo (USP), Pirassununga, São Paulo 13635-900, Brazil., Trevisoli PA; Luiz de Queiroz College of Agriculture, University of São Paulo (USP), Piracicaba, São Paulo 13418-900, Brazil., Coutinho LL; Luiz de Queiroz College of Agriculture, University of São Paulo (USP), Piracicaba, São Paulo 13418-900, Brazil., Silva NCC; Department of Food Science and nutrition, Faculty of Food Engineering, University of Campinas, Campinas, São Paulo 13083-862, Brazil., Cue RI; Department of Animal Science, Macdonald Campus, McGill University, Quebec, QC H9X 3V9, Canada., Rall VLM; Department of Chemical and Biological Sciences, Institute of Biosciences, Sao Paulo State University, Botucatu, São Paulo 18618-689, Brazil., Dos Santos MV; Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo (USP), Pirassununga, São Paulo 13635-900, Brazil.
Jazyk: angličtina
Zdroj: Veterinary sciences [Vet Sci] 2022 Oct 08; Vol. 9 (10). Date of Electronic Publication: 2022 Oct 08.
DOI: 10.3390/vetsci9100550
Abstrakt: We aimed to evaluate the impact of selective dry cow therapy (SDCT) (protocol 1: antimicrobial combined with internal teat sealant (ITS); vs. protocol 2: ITS alone) on bacterial diversity and the abundance of quarter milk. Eighty high production cows (parity ≤ 3 and an average milk yield of 36.5 kg/cow/day) from the largest Brazilian dairy herd available were randomly selected; milk quarter samples were collected for microbiological culture (MC) on the day of drying-off ( n = 313) and on day 7 post-calving ( n = 313). Based on the results of the MC before and after calving, 240 quarters out of 313 were considered healthy, 38 were cured, 29 showed new infections and 6 had persistent infections. Mammary quarters were randomly selected based on intramammary information status and SDCT protocols for bacterial diversity analyses. The bacterial diversity was similar when comparing both healthy and cured quarters submitted to both drying-off protocols. Despite healthy cows that were treated at dry-off using only teat sealant showing no alteration in the alpha and beta bacterial diversity, they did show a higher abundance of bacterial groups that may be beneficial to or commensals of the mammary gland, which implies that antibiotic therapy should be reserved for mammary quarters with a history of mastitis.
Databáze: MEDLINE
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