Avain Arazay, Azad Md Abul Kalam, García Yaneisy, García Yanelys, Martínez Yordan
Sustainable Tropical Agriculture Master Program, Zamorano University, Valle de Yeguare, San Antonio de Oriente P.O. Box 93, Francisco Morazán, Honduras.
CAS Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Processes, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
Vet Sci. 2024 Dec 22;11(12):675. doi: 10.3390/vetsci11120675.
A total of 640 one-day-old Cobb 500 MV × Cobb 500 FF mixed broilers were randomly assigned to one of four experimental treatments with four replicates per treatment and 40 birds per replicate for 32 days. The treatments consisted of a basal diet (control group), basal diet + 0.02% zinc bacitracin (AGP group), basal diet + 0.2% powder (GLP; 0.2% GLP group), and basal diet + 0.3% GLP (0.3% GLP group). The results showed that dietary 0.2% GLP supplementation increased body weight compared to the control and 0.3% GLP groups, and decreased feed conversion ratio (FCR) compared to the control group, during 19-32 days ( < 0.05). The feed intake was lower ( < 0.05) in both dietary GLP supplementation groups and the AGP group during 1-8 and 1-32 days compared to the control group. Additionally, the FCR was lower in the dietary GLP supplementation group (0.2%) and the AGP group ( < 0.05) compared to the control group. Moreover, the caeca of broiler chickens in the AGP and 0.2% GLP groups had a higher abundance of lactic acid bacteria (LAB). Supplementation of feed additives (AGP and GLP) increased the relative weight of the thymus, with no effect on the bursa of Fabricius and spleen. However, AGP supplementation decreased the serum IgM concentration, while supplementing a higher dose of GLP (0.3%) increased the ash content in the tibia. The findings indicate that 0.2% GLP is the recommended supplementation dose as a natural growth promoter to replace AGP in apparently normal chickens.
总共640只1日龄的科宝500 MV×科宝500 FF混合肉鸡被随机分配到四种实验处理中的一种，每种处理有四个重复，每个重复40只鸡，实验为期32天。处理包括基础日粮（对照组）、基础日粮+0.02%杆菌肽锌（抗生素组）、基础日粮+0.2%GLP粉剂（0.2%GLP组）和基础日粮+0.3%GLP（0.3%GLP组）。结果表明，在19至32天期间，日粮添加0.2%GLP与对照组和0.3%GLP组相比，体重增加，与对照组相比，饲料转化率（FCR）降低（P<0.05）。在1至8天和1至32天期间，日粮添加GLP组和抗生素组的采食量均低于对照组（P<0.05）。此外，日粮添加GLP组（0.2%）和抗生素组的FCR低于对照组（P<0.05）。而且，抗生素组和0.2%GLP组肉鸡的盲肠中乳酸菌数量较多。添加饲料添加剂（抗生素和GLP）增加了胸腺的相对重量，对法氏囊和脾脏没有影响。然而，添加抗生素降低了血清IgM浓度，而添加高剂量GLP（0.3%）增加了胫骨中的灰分含量。研究结果表明，0.2%GLP是作为天然生长促进剂替代明显正常鸡群中抗生素的推荐添加剂量。
