Effect of climatic factors on urinary cortisol and peripheral blood leukocytes in lambs grazing on a semi-natural grassland in the Hokuriku District of Japan

被引:1
作者
Asano, Keigo [1 ]
Takamatsu, Erina [1 ]
Numata, Hana [1 ]
Nitta, Momoyo [1 ]
Ishida, Motohiko [1 ]
机构
[1] Ishikawa Prefectural Univ, Dept Bioprod Sci, Fac Bioresouces & Environm Sci, Nonoichi, Ishikawa 9218824, Japan
关键词
chronic stress; immunity; lamb; semi-natural grassland; temperature-humidity index; HEAT-STRESS; PHYSIOLOGICAL TRAITS; NUTRITIVE CONDITIONS; MONONUCLEAR-CELLS; EXPRESSION; PARAMETERS; CATTLE; SHEEP; MILK;
D O I
10.1111/asj.13536
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The effects of climatic factors on stress and immune functions of grazing lambs in summer and autumn in the Hokuriku District of Japan were evaluated by determining urinary cortisol (U-COR) levels and peripheral blood leukocyte populations and comparing those with lambs kept indoors. Two groups of five lambs, consisting of those grazed on a semi-natural grassland (GRL) and those housed indoors in a domestic animal shelter (INL), were maintained at from July to October. The temperature-humidity index at each location was indicative of heat stress during summer; however, the U-COR elevation was not observed in both groups. The elevation was observed in GRL in autumn and was higher than INL in October. Climatic conditions in autumn were characterized by high humidity and a sudden drop in temperature. U-COR was positively correlated with the relative humidity. The GRL was exposed to low-nutrient conditions for a relatively long time. The CD4(+)/CD8(+) T cell ratio in GRL decreased in October. Subsequently, the total leucocyte, including granulocytes, monocytes, and lymphocytes, sharply increased. The responses indicated an immune deficiency caused by immunosuppression because of a low nutrition caused by grazing and high-stress conditions in autumn.
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页数:9
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