Epidemiology of Mastitis in Peripartum Dairy Heifers
نویسندگان
چکیده
............................................................................................................................ ii Acknowledgements.......................................................................................................... iii Table of
منابع مشابه
Prevalence, Risk Factors, and Strategies for Controlling Mastitis in Heifers During the Periparturient Period
Intramammary infections (IMIs) in unbred and pregnant dairy heifers were once thought to be very infrequent. However, during the last 2 decades, several studies have shown that IMIs in heifers occur frequently during the prepartum and peripartum periods. Many of these infections can persist for long periods of time, may be associated with elevated somatic cell counts (SCC), and may impair mamma...
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Blood vitamin A profiles, including concentrations of retinol and its active metabolite retinoic acid, were assessed during the peripartum period and during experimentally induced Escherichia coli mastitis in heifers. Serum retinol decreased in all animals in the immediate postpartum period and normalized within 1 wk after parturition. No significant changes were detectable in the concentration...
متن کاملOccurrence of clinical mastitis in primiparous Estonian dairy cows in different housing conditions
BACKGROUND Objectives of the study were to document the impact of some management factors on the occurrence of clinical mastitis in primiparous dairy cows and to identify common udder pathogens of clinical mastitis in freshly calved heifers and multiparous cows on the day of calving. METHODS A one-year study was conducted during 2004 and 2005 in 11 selected Estonian dairy herds. Data consiste...
متن کاملExpression of innate resistance factors in mammary secretion from periparturient dairy heifers and their association with subsequent infection status.
Mastitis in dairy heifers in the peripartum period is a common and costly problem for producers, and mammary innate resistance is of key importance in defense of the gland from bacterial invasion. A prospective observational study was undertaken in 97 dairy heifers to measure associations between expression of eight innate resistance factors in mammary secretions collected from the same animals...
متن کاملEffect of prepartum intramammary treatment with pirlimycin hydrochloride on prevalence of early first-lactation mastitis in dairy heifers.
OBJECTIVE To determine whether prepartum intramammary treatment of dairy heifers with pirlimycin hydrochloride would reduce the prevalence of intramammary infection (IMI) and lower the somatic cell count (SCC) during early lactation or improve 305-day mature equivalent milk production. DESIGN Prospective clinical trial. ANIMALS 183 Holstein-Friesian heifers (663 quarters) from 2 dairy farms...
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تاریخ انتشار 2006