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Belém, Brazil

Ferreira R.N.,Animal Health and Science Program | Ribeiro H.F.L.,ISPA UFRA | Vale W.G.,Federal University of Para | Rolim Filho S.T.,ISPA UFRA | Barbosa E.M.,Animal Health and Science Program
Revista Veterinaria | Year: 2010

Blood samples from 188 bulls, raised in wetland and floodplain areas, without control reproductive status and health, aged 2 to 15 years, of Murrah and Mediterranean breeds and its crossbred types were evaluated for the presence of antibodies to HBV-1, by testing neutralization. Also it were obtained in 51 semen samples, and analyzed by RT-PCR. All farms had positive animals, and in 155 (82,4%) of the animals blood samples tested among 188 males were serologically positive. Among the Mediterranean and Murrah breeds and their crossbred types showed a statistical significant difference in prevalence (p <0.05). There was influence of body condition scorer (BCS) in the prevalence of bulls serologically positive, and the good BCS animals showed a higher prevalence of the disease when compared to the animals with regular BCS. The prevalence according to age showed a significant difference (p <0.0001) among two years old animals and more than two years old bulls, with a progressively increasing rates of infection with advancing age. The prevalence in the Amapá State was significantly higher than in the Pará State. Through the analysis of the neutralizing antibodies distribution, it was observed a large frequency of high titers. In spite of the high titers observed most animals with titration 128, occurring in the Amapá State. Furthermore, all the 51 semen samples were negative in the test of RT-PCR. Source

Nunes K.B.,Federal University of Para | Ribeiro H.F.L.,ISPA UFRA | Rolim Filho S.T.,ISPA UFRA | Barbosa E.M.,Federal University of Para | Vale W.G.,Federal University of Para
Revista Veterinaria | Year: 2010

It was used 106 adult buffaloes, raised in extensive management, body condition score (BCS) between 2.0 and 4.0, (1- 5 scale), with a corpus luteum (CL) in one of the ovaries throughout a protocol denominated as "CL-synch". In each animal it was administered 2.0 ml of D-cloprostenol, intra muscle (IM) on day 0 (D0). Seventy two hours later, the animals with presence of uterine tone and mucus discharge through the vulva, were inseminated and at the time of insemination all animals received 1.0 ml (100g) of GnRH via IM.The pregnancy diagnose was performed after 60 days after FTAI. To evaluate the data obtained it was used the chi-square. To evaluate the variables of BSC, presence or absence of uterine tone it was used Fisher's exact test. The CL-Synch provided a rate of 38.68% pregnancy. There was a significant variable: the and body condition on pregnancy rate (p<0,05). Though the low fertility rate, it can be concluded that CL-synch is promising protocol due it benefits to concentrated the restraint management of the buffalo herd and low costs. Source

Barbas C.C.,Federal University of Para | Simoes A.R.,Federal University of Para | Nunes K.B.,Federal University of Para | Inoe S.,ISPA UFRA | And 2 more authors.
Revista Veterinaria | Year: 2010

Milk and meat production from Buffaloes, which are distributed around several Brazilian States, constitute a good economic alternative to milk and meat production from other sources. Buffaloes were introduced in Brazil at the beginning of the last century and then found a good environment to multiply and their adaptation contributed to the increase of their resistance to infectious diseases, parasitic problems, hardiness, prolificacy, longevity, early maturity and quality of their meat and milk. This aroused the interest of entrepreneurs who recognized one of the most viable alternatives for these animal products. This study aimed to estimate genetic parameters for milk yield of Murrah buffaloes, which were born from 1975 to 2001. Variance components and genetic parameters were obtained using the Bayesian inference by Gibbs sampling. Heritability and repeatability estimates were 0.39 and 0.46, respectively. The high value for the coefficient of heritability for milk production, shows that the selection process in Murrah buffaloes can lead to high genetic gains, but the genetic tendency demonstrates the lack of selection. Adoption of the breeding program directed accurate criteria for the production of milk is needed in the population of Murrah buffaloes in Brazil. Source

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