mammary secretions of 913 quarters from 229 pregnant holstein heifers were obtained aseptically to determine the prevalence of coagulase-negative staphylococci isolated during periparturient period. quarter samples were collected 14 to 10 days before expected parturition. analysis of culture data indicated that 78.5% (717/913) of samples were negative, 20.5% (187/913) contained coagulase-negati...

Intramammary infections in breeding age and pregnant heifers are much higher than previously thought. Many of these infections can persist for long periods of time, are associated with elevated somatic cell counts, and likely impair mammary development during gestation and affect milk production after calving. Prepartum intramammary antibiotic infusion of heifer mammary glands a few weeks befor...

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...

a total of 183 coagulase negative staphylococcal infected quarters and 64 uninfected quarters were randomly allotted to 4 experimental groups: infected quarters that did not receive any treatment (positive control group; n = 60); infected quarters that received tylosin (n = 61) or cefquinome (n = 62) and also uninfected quarters that did not receive any treatment were considered as negative con...

Mycoplasma Mastitis: Facts Every Producer Should Know With the ongoing expansion of dairy operations and the rapid transit of heifers across the U.S., Mycoplasma mastitis has become a herd health issue that no one can afford to ignore. No effective treatment exists for this form of mastitis and infected cows are considered positive for life. An opportunistic organism, Mycoplasma bovis frequentl...

Mastitis is a common infectious disease in dairy cattle, and is among the most economically damaging animal health problem producers face. Mastitis in dairy heifers is recognised as a distinct problem from that in older cows because of the different pattern of disease (Barkema, Schukken et al. 999; Valde, Lawson et al. 004) and unique factors that determine its occurrence (Waage, Sviland et al....

The aim of this study was to evaluate nitric oxide (NOx) concentration in infected and non-infected mammary quarters of dairy heifers before and after calving. The relationship between bacterial species and NOx concentrations, as well as correlation between NOx concentrations and postpartum somatic cell count (SCC), was assessed. Coagulase-negative staphylococci, Staphylococcus aureus and Esche...

This study was carried out for detection of nitric oxide (NO) levels in healthy (Group 1, n:78) and infected (Group 2, n:63) quarters of pregnant heifers. The mean nitric oxide (NO) concentrations were calculated of about 15,58 ± 2,21 μM/ml and 42,69 ± 6,03 μM/ml for Group 1 and Group 2, respectively. A significant difference was found between two groups, statistically (p<0,001). The mean NO co...