TY - JOUR
T1 - Influencia de la infección subclínica por agentes de la fiebre por garrapatas en vacas lecheras
AU - Pazinato, Rafael
AU - Machado, Gustavo
AU - Klauck, Vanderlei
AU - Radavelli, Willian M.
AU - Boito, Jhonatan P.
AU - Weis, Paulo H.E.
AU - Miletti, Luiz Claudio
AU - Baldissera, Matheus D.
AU - Sc, M.
AU - Stefani, Lenita M.
AU - Silva, Aleksandro S.Da
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - Infectious agents
KW - Lactose
KW - MeSH)
KW - SCC
KW - Total solids (Source: CAB
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U2 - 10.21897/rmvz.823
DO - 10.21897/rmvz.823
M3 - Article
AN - SCOPUS:85008499430
SN - 0122-0268
VL - 21
SP - 5490
EP - 5499
JO - Revista MVZ Cordoba
JF - Revista MVZ Cordoba
IS - 3
ER -