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Impacts of antibiotic reduction strategies on zootechnical performances, health control, and Eimeria spp. excretion compared with conventional antibiotic programs in commercial broiler chicken flocks.
Poultry Science ( IF 4.4 ) Pub Date : 2020-06-24 , DOI: 10.1016/j.psj.2020.05.037
Eric Parent 1 , Marie Archambault 2 , Robert J Moore 3 , Martine Boulianne 1
Affiliation  

Increasing efforts have been made in recent years to reduce antimicrobial use in animal production. The objective of this prospective study was to evaluate, in commercial broiler chicken farms, 2 antibiotic reduction strategies that eliminated the use of antibiotics important for human medicine, in comparison with the conventional use of antibiotics. On 7 broiler chicken farms, a house was allocated to the antibiotic reduction treatments for 6 consecutive flocks, whereas a similar house on the same premises was assigned to the conventional use of antibiotics (CONV) for 6 consecutive flocks. The antibiotic reduction strategies consisted of continuous in-feed use of ionophores (TX1) and continuous in-feed use of ionophores with butyric acid (TX2). In the 84 flocks, zootechnical performance was recorded, lesion scoring at 21 and 28 D of age was performed, and fecal samples were recovered during grow out for Eimeria spp. oocysts counts. There was no statistical difference between TX1, TX2, and CONV for weights at slaughter, feed conversion ratios, average daily gains, age at slaughter, total mortalities, and condemnations. The probability of identifying oocysts in the fecal samples significantly increased with the age of the flock, but there was no significant treatment effect between 7 and 16 D of age. At 19 D of age, the probability of a sample containing oocysts was higher in TX1 than in CONV, but TX2 was not statistically different from TX1 and CONV. Predicted oocysts per gram in CONV flocks were significantly lower between 22 and 34 D of age than in TX1 and TX2 flocks, whereas there were no significant differences between TX1 and TX2 for all ages. Lesion scoring of the gastrointestinal system showed no differences for coccidiosis scores between TX1, TX2, and CONV. No lesions of necrotic enteritis were observed. In conclusion, it was possible to adequately control intestinal diseases and maintain zootechnical performances by relying exclusively on ionophores, when compared with broiler chicken flocks using standard shuttle programs with antibiotic growth promoters.

中文翻译:

减少抗生素策略对动物技术性能,健康控制和艾美球虫的影响。排泄量与商业肉鸡群中常规抗生素方案相比。

近年来,人们在减少动物生产中使用抗菌药物方面做出了更大的努力。这项前瞻性研究的目的是在商业肉鸡场中评估两种减少抗生素的策略,这些策略与常规使用的抗生素相比,消除了对人类医学重要的抗生素的使用。在7个肉鸡场中,将一间房屋分配给连续6个鸡群进行抗生素减量处理,而将位于同一场所的一间类似房屋分配给6个连续鸡群的常规抗生素使用。减少抗生素的策略包括连续进料使用离子载体(TX1)和连续进料使用离子载体与丁酸(TX2)。在这84个鸡群中,记录了动物技术表现,在21和28 D年龄进行病灶评分,并在长出艾美球虫的过程中回收粪便样品。卵囊很重要。屠宰时的体重,饲料转化率,平均日增重,屠宰时的年龄,总死亡率和定罪量在TX1,TX2和CONV之间没有统计学差异。随年龄增长,在粪便样品中鉴定出卵囊的可能性显着增加,但在7至16 D岁之间没有明显的治疗效果。在19岁时,TX1中包含卵囊的样本的概率高于CONV,但TX2与TX1和CONV在统计学上没有差异。在22至34 D年龄之间,CONV鸡群的预测每克卵囊显着低于TX1和TX2鸡群,而各个年龄段的TX1和TX2之间都没有显着差异。胃肠系统的病变评分在TX1,TX2和CONV之间没有球虫病评分的差异。没有观察到坏死性肠炎的病变。总之,与使用带有抗生素生长促进剂的标准穿梭程序的肉鸡相比,仅依靠离子载体可以充分控制肠道疾病并保持动物技术性能。
更新日期:2020-06-24
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