Efficacy of a high free iodine barrier teat disinfectant for the prevention of naturally occurring new intramammary infections and clinical mastitis in dairy cows
| Autor: | M. Lopez Benavides, Marianna Gentilini, Cristian Marlon de Magalhães Rodrigues Martins, Marcos Veiga dos Santos, Eduardo de Souza Campos Pinheiro |
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| Rok vydání: | 2016 |
| Předmět: |
HIGIENE VETERINÁRIA
Veterinary medicine 040301 veterinary sciences Disinfectant chemistry.chemical_element Cell Count Iodine Milking 0403 veterinary science Mammary Glands Animal Lactation Genetics Medicine Animals Mastitis Bovine business.industry Incidence (epidemiology) 0402 animal and dairy science 04 agricultural and veterinary sciences medicine.disease 040201 dairy & animal science Mastitis medicine.anatomical_structure Milk chemistry Herd Animal Science and Zoology Cattle Female business Somatic cell count Food Science Disinfectants |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1525-3198 |
| Popis: | Using a natural exposure trial design, the goal of our study was to evaluate the clinical efficacy of an iodine teat disinfectant with barrier properties and a high level of free iodine relative to a conventional iodine teat disinfectant with no barrier properties and low levels of free iodine. During the 18 wk of the trial, quarter milk samples were collected every 2 wk from 385 dairy cows from 2 herds. Cows on both farms were assigned in a balanced way according to milk yield, number of lactation, days in milk, somatic cell count (SCC) and microbiology culture pretrial into one of following groups: nonbarrier post milking teat disinfectant (NBAR; n = 195 cows; 747 quarters) or barrier postmilking teat disinfectant (BAR; n = 190 cows; 728 quarters). Afterward, at each scoring date every 2 wk, milk SCC was quantified in samples from all mammary quarters and microbiologic culture was only performed on milk samples with SCC200,000 cells/mL for multiparous cows and SCC100,000 cells/mL for primiparous cows. A new intramammary infection (NIMI) was defined when a quarter had milk SCC200,000 cells/mL for multiparous cows and100,000 cells/mL for primiparous without microorganism isolation, and in a subsequent sampling visit had milk SCC200,000 cells/mL for multiparous cows and100,000 cells/mL for primiparous cows, and positive microorganism isolation. A quarter could have several NIMI, but only 1 case per specific pathogen was considered. The most frequently isolated microorganism group on both farms was Streptococcus spp. (6.25% of total mammary quarters), followed by coagulase-negative staphylococci (3.6%) and Corynebacterium spp. (1.5%). In the present study, an interaction occurred between treatment and week of trial on the incidence risk of NIMI. Quarters disinfected with BAR had 54 and 37% lower odds of NIMI than quarters disinfected with NBAR at 8 and 16 wk of the trial, respectively; whereas at other weeks of the study both products had similar incidence risks of NIMI. Overall, teats disinfected with BAR had 46% lower odds of acquiring a clinical mastitis than those disinfected with NBAR. We concluded that the postmilking teat disinfectant with barrier properties and higher free iodine content reduced the risk of clinical mastitis, although differences in new infections were detected at only weekly time points. |
| Databáze: | OpenAIRE |
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