ABSTRACT

The objective of the present study was to evaluate the effects of extensive grazingin a sown pasture with forestland on the health of beef cows by measuring multiple indicators. Ten Japanese Black beef cows were used in this experiment. Five of the ten cows were grazed for two months on a 1.8 ha field. The remaining cows were fed under confinement conditions. Behavioral assessments showed that grazing increased sternum lying with rumination of the cows. The grazing cows did not show any abnormal behaviors. There was a tendency for the numbers of red blood cells and lymphocytes to be lower in grazing cows than in confined cows, whereas the number of neutrophils in grazing cows was significantly higher than that in confined cows. In addition, grazing cows had a higher total antioxidant capacity and glutathione peroxidase activity than confined cows. These results suggest that extensive grazing in a sown pasture with forestland increases natural behaviors, decreases circulating red blood cells and lymphocytes and enhances neutrophil circulation, antioxidant enzyme activity, and antioxidant capacity.

摘要

本研究的目的是通过测量多个指标来评估在有林地的播种牧场粗放放牧对肉牛健康的影响。在该实验中使用了十头日本黑肉牛。10 头奶牛中有 5 头在 1.8 公顷的土地上放牧了两个月。其余的奶牛在月子里喂养。行为评估表明，放牧增加了奶牛的反刍胸骨。放牧的奶牛没有表现出任何异常行为。放牧奶牛的红细胞和淋巴细胞数量有低于禁养奶牛的趋势，而放牧奶牛的中性粒细胞数量明显高于禁养奶牛。此外，与禁养奶牛相比，放牧奶牛具有更高的总抗氧化能力和谷胱甘肽过氧化物酶活性。