Environmental Pathogens and Intramammary Infection During the Dry Period
- 1 February 1985
- journal article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 68 (2), 402-417
- https://doi.org/10.3168/jds.s0022-0302(85)80838-9
Abstract
Rate of coliform and streptococcal intramammary infection during the dry period was studied in 168 dry periods. Coliform infection rate was influenced by stage of dry period, parity, and season during which dry periods occurred. Effects of dry cow therapy, immunization, or induced inflammation on coliform infection rate were minimal. Coliform infections originating in the first 50% of the dry period and persisting to lactation were predominantly other than Escherichia coli, whereas the majority originating in the last 50% of the dry period and persisting to lactation were Escherichia coli. Duration of streptococcal infections was greater than coliform infections. Dry cow therapy reduced streptococcal infection rate, and the effect was exerted primarily during the first 25% of the dry period. Effects of parity and season were not significant and likely masked by the positive effects of dry cow therapy. Results support the contention that all quarters of all cows should be dry treated for maximum reduction of new streptococcal infection during the dry period. Results suggest that methods other than conventional dry cow therapy are required for control of coliform infection during the dry period and streptococcal infection during the latter half of the dry period.Keywords
This publication has 23 references indexed in Scilit:
- Mastitis in a large, zero-grazed dairy herdVeterinary Record, 1983
- Mastitis—Progress on ControlJournal of Dairy Science, 1983
- Sources ofStreptococcus uberisin the dairy herd: I. Isolation from bovine faces and from straw bedding of cattleJournal of Dairy Research, 1982
- Dairy Waste Solids as a Possible Source of BeddingJournal of Dairy Science, 1981
- Susceptibility of the bovine udder to bacterial infection in the dry periodJournal of Dairy Research, 1980
- Coliform Mastitis – A ReviewJournal of Dairy Science, 1979
- Variations in the susceptibility of lactating and non-lactating bovine udders to infection when infused with Escherichia coliJournal of Dairy Research, 1976
- Studies on the Control of Coliform Mastitis in Dairy CowsBritish Veterinary Journal, 1975
- Evaluation of a Hygiene and Dry Period Therapy Program for Mastitis ControlJournal of Dairy Science, 1972
- A NOTE ON A LYTIC PHENOMENON SHOWN BY GROUP B STREPTOCOCCIImmunology & Cell Biology, 1944