The objective of this study was to determine the effect of infusing the teat with an internal teat sealant at drying-off as an adjunct to long-acting antibiotic infusion at drying-off on the risk of the cow contracting clinical mastitis between parturition and 100 days in milk. The proportion of quarters with clinical mastitis between calving and the first 100 days in milk was substantially lower for quarters that were dried-off with the combination of antibiotics and the teat sealant (4.4%) compared to the quarters that were dried-off with antibiotics alone (8.4%). Three clinical mastitis cases resulted in non-functional quarters in the teat sealant group while eight clinical mastitis cases resulted in blind quarters in the group of quarters that were dried-off with antibiotics alone. Clinical mastitis occurred earlier in lactation for control quarters compared to quarters treated with both long-acting antibiotics and an internal teat sealant. The net benefit of including an internal teat sealant together with long-acting antibiotics at dry-off was estimated at 100 litres per cow per lactation after allowing for discarded milk, treatment costs and milk production losses due to clinical mastitis as well as non-functional quarters.
Source: Pol and Bonfanti – National Mastitis Council Annual Meeting Proceedings (2012) pp. 149-150. Complete abstract:www.m2-magazine.org > 010-28.02.2012