Influence of subclinical infection by agents of tick fever in milking dairy cows
Journal Title: Revista MVZ Cordoba - Year 2016, Vol 21, Issue 3
Abstract
Objective. The objective of this study was to evaluate the effect of subclinical infection by agents of tick fever in dairy cattle on milk parameters, such as production, composition, and quality. Materials and methods. The study was conducted in a private farm with 75 free-stall-housed dairy cows, from which 37 were evaluated. Monthly, individual milk samples were collected for compositional (fat, lactose, protein, and total solids) and quality (somatic cell counts (SCC)) analyses. In addition, blood samples were collected in order to identify cows that were tick fever-negative and positive by PCR for one or more of the following etiological agents: Babesia bovis, Babesia bigemina and Anaplasma marginale. Results. The results showed increased SCC in positive animals for at least one of the agents when compared to non-infected cows (p<0.05). Milk production was significantly lower in A. marginale positive animals (p<0.05). An increase of about 40% in milk solids content was found in B. bovis positive cows. Also, an increment of approximately 23% in lactose was found on cows positives for B. bigemina. Conclusions. We may conclude that the presence of at least one of these parasites in dairy cattle affects composition or quality of their milk.
Authors and Affiliations
Rafael Pazinato, M. Sc| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Science, Chapeco, SC, Brazil., Gustavo Machado, PhD| Universidade Federal do Rio Grande do Sul (UFRGS), Faculty of Veterinary Medicine, Laboratory of Veterinary Epidemiology, Porto Alegre, RS, Brazil., Vanderlei Klauck, M. Sc| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Science, Chapeco, SC, Brazil., Willian M. Radavelli, M. Sc| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Science, Chapeco, SC, Brazil., Jhonatan P. Boito, M. Sc| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Science, Chapeco, SC, Brazil., Paulo H.E. Weis, PhD| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Production, Lages, SC, Brazil., Luiz Claudio Miletti, PhD| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Production, Lages, SC, Brazil., Matheus D. Baldissera, M. Sc| Universidade Federal de Santa Maria (UFSM), Department of Microbiology and Parasitology, Santa Maria, RS, Brazil., Lenita M. Stefani, PhD| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Science, Chapeco, SC, Brazil., Aleksandro S. Da Silva, PhD *| Universidade do Estado de Santa Catarina (UDESC), Department of Animal Science, Chapeco, SC, Brazil.Correspondence: aleksandro_ss@yahoo.com.br
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