Viabilidade do controle da mastite contagiosa e da utilizaçao do escore de sujidade de úbere e de lesões de esfincter de tetos no monitoramento do risco de ocorrência da doença

Abstract

This study aimed to assess the feasibility of controlling contagious mastitis, through treatment in milk from cows suffering from mastitis subclinical by S. agalactiae and disposal of animals with subclinical mastitis S. aureus, and assess the feasibility of using scores of dirt, udder and the frequency of injuries from sphincter of teats in monitoring the risk of mastitis. The study was conducted in a dairy property in the city of Joao Monlevade, in the state of Minas Gerais, a commercial flock consists of 114 cows (Holstein[BPH] x Gir) in milk, with average production of 18 kg milk / day. The management of milking the property include all hygienic practices and proper cleaning of the teats of animals and tools used. During lactation, cows positive for S. agalactiae in microbiological examination were treated with three applications in three consecutive milkings, with intramammary antibiotic penicillin-based and novobiocina (Tetra-Delta ®), with an interval of 12 hours. Cows positive for S. aureus were discarded as soon as identified in this microbiological examination. Samples of milk and individual bulk tank were analyzed for CCS and the production of milk of animals was measured before and after treatment. Evaluations were carried out scores of dirt from the udder and the frequency of injuries from sphincter of teats in all dairy cows. For statistical analyses, the program was used statistical SAEG 9.0. All cows treated against S. agalactiae were cured and microbiological reduction of the CCS in 63% and 74% to 14 and 21 days after treatment, respectively, indicating the effectiveness of treatment. The CCS bulk tank reduced from 829,000 to 513,000 cells / ml. The parameters of udder score of dirt and frequency of injuries from sphincter of teats were not viable for monitoring the risk of mastitis