Williams R E, Hair J A, McNew R W
J Parasitol. 1978 Apr;64(2):336-42.
Studies conducted in 1975 and 1976 were made of lightweight Herefored steers, pastured on native grass pasture and infested with Gulf Coast ticks, Amblyomma maculatum Koch. The effects of tick infestations on the blood composition and weights of steers over an 8-week period were measured each year and compared to tick-free animals maintained similarly. By the end of the 8-week study infested animals averaged 8.21 kg less than control animals in 1975 and 12.42 kg less in 1976. Of the blood parameters measured significant decreases in Hb, and a lymphopenia, neutrophilia, and basophilia occurred in infested animals in 1975. In 1975 and 1976 after infestations began significant increases occurred in total serum protein, serum globulin, and plasma fibrinogen, and decreases occurred in the albumin/globulin ration of infested animals. Of the serum globulin fractions, only gamma globulin increased in infested animals in 1975 and alpha globulin in 1976. Also, during both years, decreases occurred over time in the number of ticks attaching.
1975年和1976年对在天然草地牧场放牧且感染了海湾沿岸蜱（美洲钝缘蜱，Koch）的轻型赫里福德阉牛进行了研究。每年测量蜱虫感染对阉牛血液成分和体重在8周时间内的影响，并与同样饲养的无蜱动物进行比较。到8周研究结束时，1975年受感染动物的平均体重比对照动物轻8.21千克，1976年轻12.42千克。在1975年测量的血液参数中，受感染动物的血红蛋白显著下降，出现淋巴细胞减少、中性粒细胞增多和嗜碱性粒细胞增多。1975年和1976年，蜱虫感染开始后，受感染动物的血清总蛋白、血清球蛋白和血浆纤维蛋白原显著增加，白蛋白/球蛋白比值下降。在血清球蛋白组分中，1975年受感染动物只有γ球蛋白增加，1976年α球蛋白增加。此外，在这两年中，附着的蜱虫数量随时间减少。
