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The aim of this study was to evaluate the behaviour of adenosine deaminase (ADA) activity, as well as its participation in the immunomodulation of pregnant cows. Thus, sixteen cows were divided into two groups (A and B): the group A was composed by cows not pregnant (n = 8), while the group B was composed by pregnant cows (n = 8). Serum levels of interleukin-10 (IL-10), IL-6, tumour necrosis factor alpha (TNF-α), reactive oxygen species (ROS) and C-reactive protein (CRP), as well as ADA and glutathione S-transferase (GST) activities, were measured on five sampling times (3, 5, 7 and 8 months of gestation, and soon after calving). Serum ADA activity was similar throughout the experiment in the cows belonging to the group A, but its activity increased during the experiment in cows from the group B, that is it was lower in the third and fifth months of pregnancy, and higher on months 7, 8 and after calving when compared to the group A. TNF-α and IL-6 serum levels were lower in pregnant cows compared to non-pregnant animals; however, they significantly increased after calving. Serum levels of IL-10 increased after 8 months of gestation, but it reduced after calving when compared to the group A, while CRP increased on month 8 of gestation and after calving compared to the group A. Pregnant cows showed lower serum ROS levels on months 3, 5 and 7 of gestation, and higher levels at the post-partum. Serum GST activity was higher on month 5 of gestation in pregnant cows, but it was lower on months 7, 8 and in the post-partum compared to the group A. Based on these evidence, we concluded that ADA activity and the others mediators or inflammatory modulators have important role in the maintenance of cow's gestation due to their immunomodulatory effects.

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Objective. The aim of this study was to investigate the relation among type and size of the farms related to the management of production and especially the presence and control of parasites. Materials and methods. To accomplish the above, 65 farms were used: 56 of semi-extensive system (cows in pastures), classified as low density farms (n=15, up to 15/cows), medium density farms (n=20; between 16-30/cows) and large density farms (n=21; over 31/cows). It was also included nine farms freestall system (n=9; confinement, over 70 cows) as part of the study population. Results. In the farms visited for the study can be noticed that the farms that had the higher level of technological improvement in managements practice were properties in high level (3) and freestall (4). In most of the farms there were observed the presence of ticks and flies, regardless of density of farms. Feces samples collected from 650 cows (n=10/farm), and analyzed using McMaster showed that 191 cows were positive for parasites. The presence of antibodies in bulk milk tank occurred in 36 (55.38%; CI 95% 42-67) to Neospora caninum of the studied farms. Conclusions. We also conclude that N. caninum is present in cattle herds in Western Santa Catarina, and may be linked to reproductive problems in cows.Key words: Cow, nematodes, neosporosis, production systems (Source: CAB, MeSH). RESUMENObjetivo. El objetivo de este estudio fue investigar la relación entre el tipo y el tamaño de las fincas relacionadas con la gestión de la producción, y especialmente, la presencia y el control de los parásitos. Materiales y métodos. Para lograr lo anterior, se utilizaron 65 granjas: 56 de semi-extensivo sistema (vacas en los pastos), clasificado como granjas de baja densidad (n=15, hasta 15/vacas), las granjas de densidad media (n=20; entre 16-30/vacas) y granjas grandes densidad (n=21; más de 31/vacas). También se incluyeron nueve del sistema de granjas freestall (n=9; confinamiento, más de 70 vacas) como parte de la población de estudio. Resultados. En las granjas visitadas se pudó notar que tenían el mayor nivel de mejora tecnológica en la práctica de gestiones eran propiedades en alto nivel (3) y estabulación libre (4). En la mayoría de las granjas no se observó la presencia de

Objective. This study aimed to evaluate the occurrence of gastrointestinal protozoa in dairy calves and to identify potential risk factors for this type of infection. Materials and methods. For this purpose, 243 fecal samples were collected from calves up to 60 days of age in 43 dairy farms located in the West region of Santa Catarina state, Brazil. Samples were examined by centrifugal-flotation technique. Results. As a result, Giardia was present in 26.75% (65/243) of all samples, Eimeria in 21.81% (53/243), and Cryptosporidium in 20.99% (51/243). Additionally, 46.50% (113/243) of the samples were negative for any protozoa, while 39.10% (95/243) and 14.40% (35/208) showed single and mixed infections, respectively. There was a higher association between Cryptosporidium and Giardia (6.99%) in cases of mixed infections. However, the triple protozoa association had the lowest prevalence in mixed infections (2.06%). Epidemiologically, a questionnaire was applied to determine risk factors for these parasitic infections. Based on the statistical model applied, some risk factors for Cryptosporidium infections were identified, highlighting feeding management, period of time that calves stayed with their mothers (cows), and contact with dogs; the risk of contracting Giardia increased according to the milk source, while the floor type bedding, and age were appointed as risks factors for Eimeria. Conclusions. Therefore, it is possible to confirm that Giardia, Cryptosporidium and Eimeria may infect dairy calves, and the knowledge of some risk factors associated to their infection in calves.Keywords: Cryptosporidium spp., dairy cattle, Eimeria spp, Giardia spp., parasitic diseases (Source: CAB, MeSH). RESUMENObjetivo. El objetivo evaluar la ocurrencia de protozoos gastrointestinales en terneros lecheros y de identificar posibles factores de riesgo para infección. Materiales y métodos. Se recogieron 243 muestras de heces de terneros de hasta 60 días de edad en 43 granjas lecheras ubicadas en la región del oeste del estado de Santa Catarina, Brasil. Las muestras fueron examinadas por la técnica de centrifugación-flotación. Resultados. Como resultado, Giardia estaba presente en 26.75% (65/243) de todas las muestras, Eimeria en 21.81% (53/243), y Cryptosporidium en 20.99% (51/243). DOI: doi.org/10.21897/rmvz.1027 5911 Además, 46.50% (113/243) de las muestras fueron negativas para cualquier protozoos, mientras que 39.10% (95/243) y 14.40% (35/208) mostraron infecciones simples y mixtas, respectivamente. Hubo una mayor asociación entre Cryptosporidium y Giardia (6.99%) en los casos de infecciones mixtas. Sin embargo, la asociación de triple protozoos tenía la menor prevalencia de infecciones mixtas (2.06%). Epidemiológicamente, se aplicó un cuestionario para determinar los factores de riesgo para estas infecciones parasitarias. Se han identificado algunos factores de riesgo de infecciones por Cryptosporidium, destacando manejo de la alimentación, periodo de tiempo que los terneros permanecieron con sus madres (vacas), y el...