Aluwong Tagang, Sumanu Victory O, Ayo Joseph O, Ocheja Benjamin O, Zakari Friday O, Minka Ndazo S
Department of Veterinary Physiology, Faculty of Veterinary Medicine Ahmadu Bello University, Zaria, Nigeria
Department of Veterinary Physiology, Faculty of Veterinary Medicine Ahmadu Bello University, Zaria, Nigeria.
Physiol Rep. 2017 Jun;5(12). doi: 10.14814/phy2.13314.
The aim of the experiment was to evaluate effects of zinc gluconate (ZnGlu) and probiotic administration on the daily rhythm of cloacal temperature () in broiler chickens of different age groups during the hot-dry season. One-day-old broiler chicks ( = 60) were divided into groups I-IV of 15 chicks per group, and treated for 35 days: Group I (control) was given deionized water; Group II, ZnGlu (50 mg/kg); Group III, probiotic (4.125 × 10cfu/100 mL), and Group IV, ZnGlu (50 mg/kg) + probiotic (4.125 × 10cfu/100 mL). Air dry-bulb temperature (), relative humidity (RH), and temperature-humidity index (THI) inside the pen, and of each broiler chick were obtained bihourly over a 24-h period; on days 21, 28, and 35 of the study. Values of t (32.10 ± 0.49°C), RH (49.94 ± 1.91%), and THI (38.85 ± 0.42) obtained were outside the thermoneutral zone for broiler chickens, and suggested that the birds were subjected to heat stress. Application of the periodic model showed disruption of daily rhythm of in broilers on day 21, which was synchronized by probiotic administration. The administration of probiotics or ZnGlu + probiotics to a greater extent decreased the mesor and amplitude, delayed the acrophases of in broilers, especially at day 35, as compared to the controls. Overall, the values in broiler chickens administered with probiotic alone (41.25 ± 0.05°C) and ZnGlu + probiotic (41.52 ± 0.05°C) were lower ( < 0.001) than that of the controls (41.94 ± 0.06°C). In conclusion, probiotic alone synchronized of the birds at day 21, and, in addition, decreased response most, followed by its coadministration with ZnGlu, the antioxidants may be beneficial in modulating daily rhythmicity of t and alleviating adverse effects of heat stress on broiler chickens during the hot-dry season.
本实验旨在评估在炎热干燥季节，葡萄糖酸锌（ZnGlu）和益生菌给药对不同年龄组肉鸡泄殖腔温度（）日节律的影响。将1日龄的肉鸡雏鸡（ = 60）分为I-IV组，每组15只雏鸡，并进行35天的处理：I组（对照组）给予去离子水；II组，葡萄糖酸锌（50 mg/kg）；III组，益生菌（4.125×10cfu/100 mL），IV组，葡萄糖酸锌（50 mg/kg）+益生菌（4.125×10cfu/100 mL）。在24小时内每两小时获取一次鸡舍内的空气干球温度（）、相对湿度（RH）和温湿度指数（THI），以及每只肉鸡雏鸡的。在研究的第21、28和35天进行测量。所获得的t值（32.10±0.49°C）、RH值（49.94±1.91%）和THI值（38.85±0.42）超出了肉鸡的热中性区，表明这些鸡受到了热应激。应用周期模型显示，在第21天肉鸡的日节律被打乱，而益生菌给药使其同步。与对照组相比，单独给予益生菌或葡萄糖酸锌+益生菌在更大程度上降低了中值和振幅，延迟了肉鸡的温度高峰相位，尤其是在第35天。总体而言，单独给予益生菌（41.25±0.05°C）和葡萄糖酸锌+益生菌（41.52±0.05°C）的肉鸡的温度值低于对照组（41.94±0.06°C）（<0.001）。总之，单独使用益生菌在第21天使鸡的温度同步，此外，单独使用益生菌对温度反应的降低最为明显，其次是与葡萄糖酸锌联合使用，在炎热干燥季节，抗氧化剂可能有助于调节温度的日节律并减轻热应激对肉鸡的不利影响。
