Effects of chronic cold stress on serum metabolic indexes of Mongolian cattle fed in house
The experiment was to study the effects of chronic cold stress on hormones of hypothalamus-pituitary-adrenocortical axis(HPA),hypothalamus-pituitary-thyroid axis(HPT)and sympathetic-adrenal-medulla axis(SAM),serum immunity,and antioxidant indexes in house-fed Mongolian cattle.Twenty-four 28-month-old healthy Mongolian cattle with similar age and parity were divided into cold stress period and cold stress recovery period according to the changes of environmental temperature and wind speed.The cold stress period was seven days,and the cold stress recovery period was seven days.The results showed that the average environmental temperature during the cold stress period was-12.5 ℃,and cattle were in a cold stress state.Cattle in cold stress recovery period were in non-stress state.Compared with the convalescent period of cold stress,the serum corticotropic hormone(ACTH)and cortisol(COR)contentrations of Mongolian cattle in cold stress period increased significantly(P＜0.05),while glucose(GLU)content decreased significantly(P＜0.05).The contentrations of neutrophil elastase(NE),immunoglobulin M(IgM),and immunoglobulin G(IgG)decreased extremely(P＜0.01),the contentrations of cold-induced RNA binding protein(CIRP),interleukin-4(IL-4),and lipopolysaccharide(LPS)decreased significantly(P＜0.05),and the contentrations of interleukin-6(IL-6),interleukin-2(IL-2),and immunoglobulin A(IgA)increased extremely(P＜0.0l).The activity of superoxide dismutase(SOD)and the content of malondialdehyde(MDA)decreased extremely(P＜0.01),while the activity of catalase(CAT)increased significantly(P＜0.05).The results showed that cold stress environment activated HPA axis of Mongolian cattle fed in house and increased heat production capacity of the body to resist the cold environment.Under the stimulation of cold stress,Mongolian cattle showed strong immunity and ability to maintain antioxidant balance.
国家科技期刊平台
NSTL
万方数据
维普
