O'Kelly J C
Vet Parasitol. 1984 Aug;15(2):151-7. doi: 10.1016/0304-4017(84)90030-x.
Resistance to the tick B. microplus was compared in Bos taurus steers fed hay (low fat (LF) diet) with those fed hay supplemented with whole cotton seeds (high fat (CS) diet) which made them hyperlipidaemic. The mean number of adult female ticks maturing from the same artificial doses of larvae was about 2.7 times higher on animals fed the CS diet than on animals fed the LF diet. In both dietary groups the effect of ticks: depressed packed-cell volume, plasma cholesterol and phospholipid levels, serum albumin levels, serum alkaline phosphatase (EC 3.1.3.1) and amylase (EC 3.2.1.1) activities, and monocyte count; increased the serum level of gamma-globulin and eosinophil count. Animals on the LF diet responded to tick infestation with an increase in the number of circulating lymphocytes and a decrease in the neutrophil count. In contrast, the lower tick resistance in hyperlipidaemic animals on the CS diet was associated with a decrease in the number of lymphocytes.
在以干草为食（低脂（LF）日粮）的肉牛与以添加全棉籽的干草为食（高脂（CS）日粮，这使它们出现高血脂）的肉牛中，对微小牛蜱的抗性进行了比较。从相同人工剂量幼虫发育成熟的成年雌蜱平均数量，在采食CS日粮的动物身上比采食LF日粮的动物高出约2.7倍。在两个日粮组中，蜱的影响包括：降低红细胞压积、血浆胆固醇和磷脂水平、血清白蛋白水平、血清碱性磷酸酶（EC 3.1.3.1）和淀粉酶（EC 3.2.1.1）活性以及单核细胞计数；增加γ-球蛋白血清水平和嗜酸性粒细胞计数。采食LF日粮的动物对蜱侵袭的反应是循环淋巴细胞数量增加，中性粒细胞计数减少。相比之下，采食CS日粮的高血脂动物较低的蜱抗性与淋巴细胞数量减少有关。
