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Diversos problemas sanitarios sao relevantes na criacao de ovinos. Existe uma carencia de estudos que abordem o diagnostico da mastite ovina, especialmente das racas de aptidao para a producao de carne. E ste trabalho objetivou determinar a ocorrencia dos agentes etiologicos da mastite subclinica em ovelhas das racas Santa Ines e Morada Nova no momento da secagem e sua susceptibilidade em desenvolver a doenca quando submetidas as mesmas condicoes de manejo. Analisou-se 250 mamas de 130 ovelhas da raca Santa Ines e 143 mamas de 77 ovelhas da raca Morada Nova. Amostras de leite foram coletadas no momento da secagem e submetidas ao California Mastitis Test , a contagem de celulas somaticas e analises microbiologicas. As ocorrencias da mastite subclinica ovina nas racas Santa Ines e Morada Nova foram analisadas utilizando o teste de qui-quadrado. Os valores significativos de qui-quadrado proximos aos valores tabelados foram ajustados de acordo com a correcao de continuidade de Yates . As ocorrencias de animais com mastite subclinica infecciosa foram de 33,1% e de 35,1% nas ovelhas Santa Ines e Morada Nova, respectivamente, nao diferindo significativamente. Das mamas avaliadas das ovelhas Santa Ines, 20,4% apresentaram mastite subclinica com os seguintes agentes etiologicos e respectivas ocorrencias: Staphylococcus coagulase-negativos (ECN) (46%), Coliformes (22%), Streptococcus spp. (12%), Corynebacterium spp. (6%), Micrococcus spp. (6%), Staphylococcus aureus (2%), Staphylococcus coagulase-positivos (2%) e infeccao mista de ECN e Streptococcus spp. (4%). Das mamas avaliadas das ovelhas Morada Nova, 21% apresentaram mastite subclinica com os seguintes agentes etiologicos e respectivas ocorrencias: ECN (56,7%), Coliformes (13,3%), Corynebacterium spp. (10,0%), Staphylococcus aureus (10,0%), Micrococcus spp. (6,7%) e Streptococcus spp. (3,3%). Os ECN podem ser considerados os mais importantes agentes etiologicos da mastite subclinica ovina. Ovelhas das racas Santa Ines e Morada Nova apresentam as mesmas chances de desenvolver mastites subclinicas quando submetidas ao mesmo sistema de manejo. SUMMARY There are several relevant health problems in sheep rearing while few studies address the diagnosis of ovine mastitis, especially in breeds suitable for meat production. This study aimed to determine the occurrence of the etiologic agents of subclinical mastitis in ewes of Santa Ines and Morada Nova breeds at the time of drying and their susceptibility to develop the disease when subjected to the same management conditions. We analyzed 250 breasts of 130 Santa Ines ewes and 143 breasts of 77 Morada Nova ewes. Milk samples were collected at the time of drying and submitted to the California Mastitis Test, somatic cell count and microbiological analyses. The occurrence of subclinical mastitis in ewes of Santa Ines and Morada Nova breeds was statistically analyzed using the chi-square test. Chi-square significant values, ​​close to the tabulated values, ​​were adjusted according to Yates continuity correction. The occurrences of animals with infectious subclinical mastitis were 33.1% and 35.1% in Santa Ines and Morada Nova breeds, respectively, and did not differ significantly. From the breasts of Santa Ines ewes evaluated, 20.4% had subclinical mastitis with the following etiologic agents and their occurrences: coagulase-negative Staphylococcus (CNS) (46%), coliforms (22%), Streptococcus spp. (12%), Corynebacterium spp. (6%), Micrococcus spp. (6%), Staphylococcus aureus (2%), coagulase-positive Staphylococcus (2%) and mixed infection of CNS and Streptococcus spp. (4%). Furthermore, from the evaluated breasts of Morada Nova sheep, 21% had subclinical mastitis with the following etiologic agents and their occurrences: CNS (56.7%), coliforms (13.3%), Corynebacterium spp. (10.0%), Staphylococcus aureus (10.0%), Micrococcus spp. (6.7%) and Streptococcus spp. (3.3%). CNS can be considered the most important etiological agent of subclinical mastitis in sheep. Both breeds, Santa Ines and Morada Nova, have the same chances of developing subclinical mastitis when subjected to the same management system.

ars veterinária

OCORRÊNCIA DOS AGENTES ETIOLÓGICOS CAUSADORES DE MASTITE SUBCLÍNICA EM OVELHAS DAS RAÇAS MORADA NOVA E SANTA INÊS / OCCURRENCE OF ETIOLOGICAL AGENTS CAUSING SUBCLINICAL MASTITIS IN MORADA NOVA AND SANTA INÊS EWES