期刊
ANIMAL SCIENCE JOURNAL
卷 90, 期 8, 页码 1033-1041出版社
WILEY
DOI: 10.1111/asj.13248
关键词
complete blood cell count; grazing; leukocyte differentiation; lymphocyte subset analysis; oxidative stress
资金
- United Graduate School of Agricultural Science, Gifu University Funding Source: Medline
This study aimed to reveal the effects of direct exposure to cold weather under grazing in winter (GW) on the health of Japanese Black beef cattle, as assessed using physiological, immunological, and behavioral parameters. Ten Japanese Black beef cattle (328 +/- 45 kg, 7.6 +/- 3.4 years of age) were used in this experiment. In winter, five of the 10 cattle grazed for 2 months in a 1.8 ha pasture (GW), and the remaining cattle were fed under confined conditions with tethering (control [CT]). The two groups were fed similar feed during the experiment, except for the grazing forage. Blood samples were collected approximately every 2 weeks. The numbers of neutrophils and monocytes and antioxidant enzyme activity were higher in the GW group than in the CT group (p < 0.05). The proportions of CD4-single-positive cells were lower in GW cattle than in CT cattle (p = 0.06). This study showed that direct exposure of beef cattle to cold weather under GW enhanced the levels of circulating neutrophils and monocytes and contributed to the kinetic homeostasis of lymphocytes but also activated antioxidant enzymes due to an increase in oxidative stress.
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