Malila Yuwares, Jandamuk Anuwat, Uopasai Thanawan, Buasook Thongsa, Srimarut Yanee, Sanpinit Pornnicha, Phasuk Yupin, Kunhareang Sajee
National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, Tambon Khlong Nung 12120, Thailand.
Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
Animals (Basel). 2021 Dec 11;11(12):3532. doi: 10.3390/ani11123532.
The present study aimed at assessing the impact of cyclic thermal stress on production performance and meat quality of commercial broilers (BRs), Thai native chickens (NT) and the hybrids between BR and NT (H75; crossbreed 25% NT). At the age of 3, 5 and 9 weeks for BR, H75 and NT, respectively, each strain was equally divided ( = 50) into control and treatment groups. The controls were raised at a constant 26 ± 1 °C, while the treatments were subjected to thermal stress (35 ± 1 °C, 6 h daily) for 3 weeks. The results indicated that final weight and average daily gain of BR and NT treated groups were significantly lower than those of their control counterparts. Reduced body weight gain of BR and H75, as well as feed intake of H75, was observed in the treatment groups ( < 0.05). The stressed BR breasts showed decreased moisture, fat and carbohydrate, accompanied by increased protein, ash, L -value, b-value and shear force ( < 0.05). No significant effects ( ≥ 0.05) of the thermal stress on meat quality indices were found for H75 and NT breast samples. Pectoral myopathies were observed in BR and H75 chickens, but the numbers of cases were decreased in the thermally treated groups.
本研究旨在评估周期性热应激对商品肉鸡（BR）、泰国本地鸡（NT）以及BR和NT的杂交种（H75；25% NT杂交种）的生产性能和肉质的影响。分别在BR、H75和NT 3周龄、5周龄和9周龄时，将每个品系均分为对照组和处理组（每组n = 50）。对照组在26±1℃的恒定温度下饲养，而处理组则在热应激条件下（35±1℃，每天6小时）饲养3周。结果表明，BR和NT处理组的终体重和平均日增重显著低于其对照组。在处理组中观察到BR和H75的体重增加减少，以及H75的采食量减少（P < 0.05）。应激处理的BR鸡胸肉的水分、脂肪和碳水化合物含量降低，同时蛋白质、灰分、L值、b值和剪切力增加（P < 0.05）。对于H75和NT鸡胸肉样本，未发现热应激对肉质指标有显著影响（P≥0.05）。在BR和H75鸡中观察到胸肌病，但热处理组的病例数有所减少。
