ICAR-Directorate of Poultry Research, Rajendranagar, India.
J Anim Physiol Anim Nutr (Berl). 2022 Mar;106(2):284-295. doi: 10.1111/jpn.13579. Epub 2021 Jun 10.
Nicobari is an indigenous bird reared for meat and eggs. This study evaluated the effect of heat stress on plasma levels of leptin, growth hormone and their receptors, liver AMP kinase, plasma cholesterol and lipid peroxide (MDA). The laying period coincided with the post summer period. The birds were equally divided into three groups, control group was offered ad libitum feed and treatment groups were supplemented with fermented yeast culture at 700 mg (T1) and 1.4 g/kg (T2) of feed/day. The levels of plasma Leptin and GH hormones were higher (p < 0.05) in the control group when compared to the treatment groups. The expression of the hormone receptors was higher in the brain, and MMP3 gene expression in the magnum was lower in the treatment group. Plasma cholesterol, MDA and AMP kinase were significantly higher (p < 0.05) in the control group. Fermented yeast culture supplementation decreased feed intake and increased egg production parameters, which indicates a greater efficiency of supplementation. Supplementation reduced the severity of necrosis of villi in the jejunum when compared to control. In conclusion, higher ambient temperature during summer had negative effect on production parameters through modulation of physiological parameters which could be ameliorated by supplementation of FYC.
尼科巴鸠是一种用于肉和蛋生产的本土鸟类。本研究评估了热应激对血浆瘦素、生长激素及其受体、肝脏 AMP 激酶、血浆胆固醇和脂质过氧化物（MDA）水平的影响。产卵期与夏季过后的时期相吻合。鸟类被平均分为三组，对照组自由采食，处理组分别用 700mg（T1）和 1.4g/kg（T2）的发酵酵母培养物进行补充。与处理组相比，对照组的血浆瘦素和 GH 激素水平更高（p<0.05）。激素受体在大脑中的表达更高，而处理组的 magnum 中的 MMP3 基因表达更低。血浆胆固醇、MDA 和 AMP 激酶在对照组中显著升高（p<0.05）。发酵酵母培养物的补充减少了采食量，增加了产蛋参数，表明补充的效率更高。与对照组相比，补充物减少了空肠绒毛坏死的严重程度。总之，夏季较高的环境温度通过调节生理参数对生产参数产生负面影响，而 FYC 的补充可以改善这种情况。
