Update on the use of polyethylene intramammary device [IMD] in mastitis control

ABSTRACT

IMD are small flexible organic polymer loop inserted aseptically into the gl and cistern of the udder to stimulate an immune response and increase levels of milk somatic cell counts [MSCC] within the mammary gl and to a number sufficient to create a leucocytic barrier against intramammary infection [IMI], this was shown after experimental challenge with Staphylococcus aureus, Escherichia coli, Streptococcus uberis, Streptococcus agalactiae,. etc. into quarters fitted with IMD compared to control quarters. Results from field testing of the abraded IMD indicated that it was highly successful in reducing the incidence of clinical mastitis. The effect of IMD on milk yield is conflicting but generally is not significant. Immunization appeared to confer additional protection to mammary quarters containing IMD. The lack of any difference in N-acetyl-beta-D-glucosaminidase [NAGase] activity and RBCs concentration in milk between IMD and control quarters, indicated no damage to milk secretory tissues due to IMD. The IMD appeared to be well tolerated by dairy cows and abnormal side effects were not a problem, and in general it offers promise in the control mastitis