The Strategic Control Study of Coccidiosis in Native Chickens

• Main Authors: Liang Chien-Kuo, 梁建國
• Other Authors: 蔡信雄
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/41227702318068808840

碩士 === 國立屏東科技大學 === 獸醫學系 === 92 === This study was to investigate the protection efficacy of different Coccidiosis controlling methods, and also the effect on growth performance in Taiwan red-feather native broilers. At day 4, 504 healthy chicks on floor pen were divided into 6 treatments, each treatment had 2 replicates; 42 chicks on each treatment, male and female were equally mingled on each pen during trials. Treatment A was positive control, which neither anticoccidial drug inclusion in feed nor coccidial challenges were used during the entire trial period. Treatment B was negative control, which anticoccidial drug was included till week 5.2. Treatment C used Chinese herb COCCI-GUARDâ (500 ppm dose). Treatment D contains Cygro (anticoccidial drug, Cyanamid Co.). Treatment E used Maduramicin (anticoccidial drug from Shandong Chilu, China). Treatment F used Coccivacä vaccine(Shering Plough Animal Health). At week 6, all treatments except treatment A were inoculated with sporulated oocytes of E. tenella provided from Cyanamid Co. at 1.4´ 106 per bird through crop administration. Birds from Treatment F were dosed 1 Coccivacä at day 6 orally. During the trial, body weight、feed consumption、and mortality were recorded at week 4, 6, 7, 8, 10. The feces were randomly obtained from litter of each pen at week 3, 6, 7 to count the coccidial oocytes. At week 7, autopsy were performed for 2 male and 3 female birds from each pen to examine the intestinal leision score. The results indicated that different Coccidiosis controlling methods lead to various protection efficacy and growth performance. Comparing with negative control, Cygro significantly showed better protection efficacy, FCR, livability, body weight gain, lower oocyte counts in feces, and leision score (p<0.05). COCCI-GUARDâ didn’t exhibit enough protection capability under coccidial oocytes challenges, but with better resilience on performance afterwards. Maduramicin and Coccivacä, compared with negative control, showed significantly better protection effect in terms of mortality and leision score (p<0.05), while no difference was observed on FCR and weight gain. Maduramicin and Cygro, same chemical composition but different manufacturing origins, had the different anticoccidial effect. Whether both had different carrier or process need to be further studied. In this trial, enormous deaths in Coccivacä treatment showed the failure to sustain the E. tenella challenges, indicating that coccidial vaccine protection efficacy still require further study on the vaccination method, including administration, age, procedure, vaccine kind etc. to solidify actual immunity and protection.