Mohiti-Asli M, Ghanaatparast-Rashti M
Department of Animal Science, Faculty of Agriculture Science, University of Guilan, 41635-1314 Rasht, Iran.
Department of Animal Science, Faculty of Agriculture Science, University of Guilan, 41635-1314 Rasht, Iran.
Prev Vet Med. 2015 Jun 15;120(2):195-202. doi: 10.1016/j.prevetmed.2015.03.014. Epub 2015 Mar 31.
An experiment was conducted to determine the effects of oregano essential oil on growth performance and coccidiosis prevention in mild challenged broilers. A total of 250 1-d-old chicks were used in a completely randomized design with 5 treatments and 5 replicates with 10 birds in each replication. Experimental treatments included: (1) negative control (NC; unchallenged), (2) positive control (PC; challenged with sporulated oocysts of Eimeria), (3) PC fed 200 ppm Diclazuril in diet, (4) PC fed 300 ppm oregano oil in diet, and (5) PC fed 500 ppm oregano oil in diet. At 22 d of age, all the experimental groups except for NC were challenged with 50-fold dose of Livacox T as a trivalent live attenuated coccidiosis vaccine. On d 28, two birds were slaughtered and intestinal coccidiosis lesions were scored 0-4. Moreover, dropping was scored in the scale of 0-3, and oocysts per gram feces (OPG) were measured. Oregano oil at either supplementation rate increased body weight gain (P=0.039) and improved feed conversion ratio (P=0.010) from d 22 to 28, when compared with PC group. Using 500 ppm oregano oil in challenged broilers diet increased European efficiency factor than PC group (P=0.020). Moreover, challenged broilers fed 500 ppm oregano oil or Diclazuril in diets displayed lower coccidiosis lesions scores in upper (P=0.003) and middle (P=0.018) regions of intestine than PC group, with the effect being similar to unchallenged birds. In general, challenged birds fed 500 ppm oregano oil or Diclazuril in diets had lower OPG (P=0.001), dropping scores (P=0.001), litter scores (P=0.001), and pH of litter (P=0.001) than PC group. It could be concluded that supplementation of oregano oil at the dose of 500 ppm in diet may have beneficial effect on prevention of coccidiosis in broilers.
进行了一项实验，以确定牛至精油对轻度感染球虫病的肉鸡生长性能和球虫病预防效果的影响。总共250只1日龄雏鸡采用完全随机设计，分为5个处理组，每组5个重复，每个重复10只鸡。实验处理包括：(1)阴性对照组(NC；未感染)，(2)阳性对照组(PC；用艾美耳球虫孢子化卵囊感染)，(3)在日粮中添加200 ppm地克珠利的PC组，(4)在日粮中添加300 ppm牛至精油的PC组，以及(5)在日粮中添加500 ppm牛至精油的PC组。在22日龄时，除NC组外，所有实验组均用50倍剂量的Livacox T作为三价活的减毒球虫病疫苗进行感染。在第28天，宰杀两只鸡，并对肠道球虫病病变进行0至4分的评分。此外，对粪便进行0至3分的评分，并测量每克粪便中的卵囊数(OPG)。与PC组相比，添加任何一种剂量牛至精油均能增加22至28日龄肉鸡的体重增加(P = 0.039)，并改善饲料转化率(P = 0.010)。在感染球虫病的肉鸡日粮中添加500 ppm牛至精油，其欧洲效率因子高于PC组(P = 0.020)。此外，在日粮中添加500 ppm牛至精油或地克珠利的感染球虫病肉鸡，其肠道上段(P = 0.003)和中段(P = 0.018)的球虫病病变评分低于PC组，效果与未感染鸡相似。总体而言，在日粮中添加500 ppm牛至精油或地克珠利的感染球虫病肉鸡，其OPG(P = 0.001)、粪便评分(P = 0.001)、垫料评分(P = 0.001)和垫料pH值(P = 0.001)均低于PC组。可以得出结论，在日粮中添加500 ppm的牛至精油可能对预防肉鸡球虫病有有益作用。
