Wegner T N, Schuh J D, Nelson F E, Stott G H
J Dairy Sci. 1976 May;59(5):949-56. doi: 10.3168/jds.s0022-0302(76)84303-2.
Blood and milk samples from Holstein cows were examined for total blood leucocyte count, differential blood leucocyte count, milk quality test, and somatic cell count in milk while the cows were stressed by corticotropin injection, confinement in a heat-humidity chamber, or environmental-heat stress by exposure during the hot summer months of June through November in southern Arizona. All three stressing conditions resulted in a moderate blood leucocytosis. Modest increases in somatic cell counts of milk were associated with corticotropin injection and environmental-heat stress. Positive correlations were recorded between blood leucocytes and somatic cell counts of milk in mastitis-free cows injected with corticotropin and between percent blood neutrophils and somatic cell counts of milk in environmental-heat stressed cows with no evidence of current mastitis.
在亚利桑那州南部6月至11月的炎热夏季，通过注射促肾上腺皮质激素、将奶牛关在湿热箱中或使其暴露于环境热应激下对荷斯坦奶牛施加压力，同时检测这些奶牛的血液和牛奶样本，以测定全血白细胞计数、血液白细胞分类计数、牛奶质量检测以及牛奶中的体细胞计数。所有这三种应激条件均导致中度的血液白细胞增多。牛奶体细胞计数的适度增加与促肾上腺皮质激素注射及环境热应激有关。在注射促肾上腺皮质激素的无乳腺炎奶牛中，血液白细胞与牛奶体细胞计数之间存在正相关；在无当前乳腺炎迹象的环境热应激奶牛中，血液中性粒细胞百分比与牛奶体细胞计数之间也存在正相关。
