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首页> 外文期刊>International Journal of Livestock Production >Effect of long-term heat stress on key enzyme activities and T3 levels in commercial layer hens
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Effect of long-term heat stress on key enzyme activities and T3 levels in commercial layer hens

机译:长期热应激对商品蛋鸡关键酶活性和T3水平的影响

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High environmental temperatures are the most important inhibiting factors to poultry production in hot regions. The objective was to test adaptive responses of different chicken genotypes to long-term high temperature and identify suitable indicators of physiological parameters. Forty eight female chickens from each genotype of Lohmann Brown (LB), Lohmann White (LW), New Hampshire (NH), White Leghorn selected for improved feed efficiency (WL-FE) and dwarf White Leghorn (WL-dw) were randomly assigned either to the control group (18 to 20°C) or to the experimental group (30 to 32°C). Blood samples were collected from randomly selected 12 birds of each genotype at three age points. Levels ofglutamic-pyruvic transaminase (GPT), glutamic-oxaloacetic transaminase (GOT), creatine kinase (CK), lactate dehydrogenase (LDH) and 3,5,3'-triiodothyronine (T3) were determined in plasma. The results indicated that compared to controls, the GPT activity in heat stressed chickens significantly increased by 29.2% in all genotypes. The CK activity in heat stressed chickens was only significantly higher at 22 weeks old. Activities of GOT and LDH were variable in all heat stressed chickens. The T3?concentration significantly reduced by 41% in all heat stressed chickens and the WL-dw had the lowest value. We concluded that T3?could be considered as reliable indicator of long-term heat stress. Moreover, LW and WL-dw genotypes demonstrated better heat tolerant.
机译:高环境温度是炎热地区家禽生产的最重要抑制因素。目的是测试不同基因型鸡对长期高温的适应性反应,并确定合适的生理指标。随机分配了来自Lohmann Brown(LB),Lohmann White(LW),New Hampshire(NH),为提高饲料效率(WL-FE)而选择的白来亨鸡和矮白来亨鸡(WL-dw)每种基因型的48只母鸡对照组(18至20°C)或实验组(30至32°C)。在三个年龄点从每种基因型的随机选择的12只鸟中收集血液样本。测定血浆中谷氨酸-丙酮酸转氨酶(GPT),谷氨酸-草酰乙酸转氨酶(GOT),肌酸激酶(CK),乳酸脱氢酶(LDH)和3,5,3'-三碘甲甲状腺素(T3)的水平。结果表明,与对照组相比,热应激鸡的GPT活性在所有基因型中均显着提高了29.2%。热应激鸡的CK活性仅在22周龄时显着较高。在所有热应激鸡中,GOT和LDH的活性是可变的。在所有热应激鸡中,T3?浓度显着降低了41%,而WL-dw值最低。我们得出的结论是,T3?可被视为长期热应力的可靠指标。此外,LW和WL-dw基因型表现出更好的耐热性。

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