獣医科学と技術

The study aimed at assessing parasite control practices in use and to determine existence of gastro intestinal nematodes resistance for Albendazole, Tetraclozash and Ivermectin, in naturally infected sheep under field conditions. In Lemu Bilbilo district, sheep of both sexes randomly select from small holder farmers from different Pa’s were used for the study. Before the actual experiment, screening was done to identify sheep naturally infected with Gastro intestinal nematodes and Eggs per Gram (EPG) greater than 200 were eligible for inclusion in the field experiment following guidelines by Coles, et al. Accordingly a total of 48 animals grouped into four treatment groups Albendazole, Tetraclozash, Ivermectin and control (left untreated). Albendazole, Tetramisole and Ivermectin were found 90.53%, 98.1% and 96.59% respectively.

The percentage reduction of faecal egg count (95% confidence intervals) for Albendazole, Tetraclozash and Ivermectin were, 95.83%, (95.1-84.4) 98.1% (99- 90.99) and 96.59% (97.01-91.3) respectively. Resistance is suspected on albendazole based on the findings, it was concluded that development of anthelmintic resistance could be prevented by avoid frequent and unnecessary treatments anthelmintics, opting instead for strategic deworming.

A cross sectional study was conducted in apparently healthy unvaccinated backyard and small scale chicken from November 2019 to May 2020 at Jimma town, Ethiopia to estimate sero-prevalence of Infectious Bursal Disease (IBD) and its risk factors. Infectious bursal disease is highly contagious disease challenging the poultry industry world-wide. It is among the obstacle in the chicken production in Ethiopia. A total of 384 chickens were selected from purposively selected 100 poultry farms to estimate the sero-prevalence of IBD and to identify its risk factors. Data analysis was performed using stata software. Out of 384 serum samples tested, 206 were positive for indirect ELISA and overall prevalence of the disease was found to be 53.6% and flock-level prevalence with at least one seropositive chicken in the flock. The result of logistic regression analysis showed that age and isolation practice were significant risk factors for occurrence of IBD. Results of questionnaire survey revealed that majority of the respondents lack sufficient knowledge about IBD. Prevalence of IBD has statistically significant difference among owner age, educational level and experiences of rearing chicken. Hence, proper vaccination program and awareness creation of farmers on benefits of practicing isolating sick chickens should be implemented.

The study was performed in small holder dairy cows in and around Nekemte town from October, 2011 to May, 2012 to determine major postpartum reproductive health problems in the area through retrospective data analyses, questionnaire survey and clinical follow-up study. A total of 2295 recorded reproductive cases were examined in the retrospective study of which, reproductive health problems accounted over all prevalence of 11.2% (N=256). Of the 256 affected dairy cows, retained fetal membrane accounted for 4.84%, where as abortion, dystocia, prolapse (uterine or vaginal) and metritis accounted for 2.48%, 1.83%, 0.9% and 0.8%, respectively.

Of a total of 385 cows included in the questionnaire survey (N=355) and clinical follow-up (N=30), 102 (25.1%) were found with major reproductive health problems. The major reproductive health problems obtained were retained fetal membrane, followed by dystocia, repeat breeding, abortion and metritis with prevalence rates of 10.9%, 7.5%, 3.1%, 1.82%, and 1.04%, respectively.

The prevalence rates of major reproductive health problems were significantly different with respect to breed, (p=0.013), age (p=0.000), body condition (p=0.028), management (p=0.000) and parity number (p=0.0183) of dairy cows. Risk factors analysis revealed that prevalence of the major reproductive health was higher in adult cows (OR=3.6; 95%CI=1.72, 7.55), primi para cows (OR=4.3; 95%CI=2.17, 8.5), cows kept intensively (OR=3.2; 95%CI=1.93, 5.4), cows with poor body condition (OR=0.65; 95%CI=0.390, 1.066) and those exotic breeds (OR=1.9; 95% CI=1.13, 3.14) than those corresponding animals. In Conclusion, retained fetal membrane, dystocia, repeat breeding, abortion and metritis were found to be the major reproductive health problems in and around Nekemte town, west of Ethiopia.