Abstract
Effectiveness of a polyethylene intramammary device against naturally occurring infections was evaluated in three Maryland herds over 2 yr. Treated cows [62] were fitted with intramammary devices in all quarters of udders. Control cows [62] were sham treated. Rates of new intramammary infection over single lactation in treated and control quarters of primiparous cows averaged 18 and 27%. Reduction of infection rate was due primarily to fewer Corynebacterium bovis infections. Infection rate between multiparous cow treatments were similar.In uninfected quarters cell counts in strippings averaged .11 to .13×106/ml and in quarters fitted with intramammary devices concentrations were only .22 to .31×106 cells/ml. But in infected quarters with intramammary devices, cell counts of strippings were 1.38 to 1.48×106/ml. Concentrations of somatic cells of strippings in infected quarters without devices averaged .48 to .63×106/ml.Dairy herd improvement cell counts for primiparous and multiparous cows with and without intramammary devices were similar and averaged .2×106/ml. Neither milk nor fat production differed.The intramammary device as currently designed is incapable of stimulating a leukocytosis sufficient in stripping milk to prevent intramammary infection.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
