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Incidence of Peri-Calving Clinical Mastitis in Maiden Heifers Treated with an Internal Teat Sealant at Varying Pre-Calving Intervals
Newton H.
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Objectives:
Many farmers do not graze their maiden heifers at the dairy farm. It is not therefore always practical to administer an internal teat sealant to those heifers until they are transported back to the dairy farm, which is usually less than four weeks before calving. The objective of this study was to administer an internal teat sealant to maiden heifers closer to the point of calving than the recommended label instructions of four weeks and to examine its effect on the incidence of clinical mastitis and when it occurs relative to calving and time sealed.
Methods:
741 heifers from four seasonally calving herds in the Waitaki District, representative of typical South Island dairy farms, were enrolled. Heifers were treated on return to the dairy farm and were within four weeks of the planned start of calving. Either the left hand quarters or the right hand quarters within each heifer were randomly assigned to receive either a teat sealant (Teatseal®, Zoetis) or no treatment apart from teat spraying as the heifer left the shed. Heifers were treated in the milking shed. Heifers on three farms were given 0.5ml of xylazine (Phoenix xylazine® 2% injection) intramuscularly to facilitate treatment. Teats selected to be sealed were cleaned with alcohol impregnated teat wipes and the ends were scrubbed vigorously until the "button" covering the teat orifice was removed. Teat sealant was then inserted into the two selected teats. All teats were then teat sprayed with the standard teat spray used on the farm. All people in the shed wore disposable gloves. Heifers were then managed as per normal management practices on the four individual farms. All heifers had a pasture based diet after seal insertion. The farmers were not provided with a definition of what constituted mastitis and the diagnosis and treatment of mastitis were carried out as per normal practice on the four farms. The outcome examined was the incidence of mastitis peri-calving (recorded between the commencement of calving around 1st August and the 31st October) with respect to the time the quarter was sealed. […]
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About
Affiliation of the authors at the time of publication
Veterinary Centre - Oamaru, Oamaru, New Zealand
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