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Brucellosis, leptospirosis, bovine viral diarrhea (BVD) and bovine infectious rhinotracheitis (IBR) are abortive diseases that compromise productive efficiency in cattle. In different municipalities of Oaxaca, Mexico, reproductive problems suggestive of these diseases have been observed. This study determined the frequency of DVB, IBR, brucellosis and leptospirosis in dual-purpose cattle herds in different regions of Oaxaca Mexico. A total of 2,691 blood samples were collected from 127 bovine herds to diagnose brucellosis serologically using the rose bengal and Rivanol tests; microscopic agglutination test (MAT) with a battery of six Leptospira serovars; ELISA by blocking and indirect for BVD and IBR respectively. The apparent overall frequency of herd was brucellosis: 2.3%, leptospirosis: 86.6%, IBR: 65.4% and BVD: 56.7%. The real frequency for brucellosis, leptospirosis, IBR and BVD was -9.1% (CI95 = -10.1, -7.9%), 64.3% (CI95 = 62.5, 66.1%), 40.1% (IC95 = 38.2, 41.9%) and 33.2 % (IC95 = 31.4, 35.0%) respectively. In the Costa region, the highest percentage of animals with antibodies against Leptospira, IBR and BVD was observed. The present study showed serologically the presence of antibodies against brucellosis, IBR, DVB and six serovars of Leptospira in bovine herds double purpose of the state of Oaxaca, Mexico. [ABSTRACT FROM AUTHOR]

The profitability of dairy farms is closely linked to reproductive performance. Identifying risk factors that compromise this performance is vital to implementing strategies to improve productivity. An analysis was done of the effects on reproductive performance of artificial insemination (AI) use, herd size and high seroprevalence of reproductive infectious diseases. Data on reproductive events were collected from 52 farms (10-100 cows; 959 lactations) over 18 mo (births 2011-2012). Neosporosis, bovine infectious rhinotracheitis (IBR) and bovine viral diarrhea (BVD) seroprevalences were documented at each farm. Multiple logistic regression analyses were applied to determine the degree of association (odds ratio, OR) between potential risk factors and reproductive variables. Herds of 33 or more cows (OR= 1.5) and high neosporosis seroprevalence (OR= 2.3) were risk factors for assisted calving. High IBR and BVD seroprevalences (OR= 1.3 and 1.9, respectively) were risk factors for days to first service over 70 d in milk (DFS>70). Artificial insemination was a common risk factor for DFS>70 (OR= 2.4) and days open over 110 days in milk (OR= 1.3). Herds of 33 or more cows was a risk factor for nonpregnant cows at first service (OR= 1.7). Artificial insemination, herds of 33 or more cows and high neosporosis, IBR and BVD seroprevalences are factors associated with reproductive performance in small-scale dairy farms in various geographical regions in Mexico. [ABSTRACT FROM AUTHOR]

In this study, a serologic research was performed to estimate seropositivity of infectious agents related to abortus in dairy Holstein cows from Tizayuca, Hgo., Mexico. Two hundred sixty one blood samples were obtained from coccygeal vein and centrifuged at 2500 rpm for 5 min. Sera was removed and stored at -20°C until its analysis by ELISA method for antibodies to Neospora caninum, IBR, PI3, RVSB virus, and by card test for Brucella abortus. The results obtained show the high percentage of all five agents, Neospora caninum (48,65%), PI3 (44,44%), RVSB (35. 43%), IBR (35,18%) and Brucella abortus (32,18%) which indicates that an appropiate control programme as much as differential diagnosis in aborted foetuses or placenta should be considered. [ABSTRACT FROM AUTHOR]