Stoimenov K
Vet Med Nauki. 1976;13(7):48-54.
It has been found that the survival rate of Heterakis worms in chickens aged from one to seven months is directly dependent on the number of Heterakis eggs that have gained access in them only in the case of lower numbers of infective eggs (10 and 50). At comparatively larger numbers of eggs (500 and 2500) the survival rate has been highest at the 3- and 4-month-old chickens, and the morphologic changes in this age group are most pronouncedly expressed. Investigations have shown that the greatest survival rate corresponds to the weakest increase in the leukocyte count and the amount of the gamma-globulins in the 3- and 4-month-old chickens. In the one- and 2-month-old ones the Heterakis infection has caused a strong increase in the leukocyte count, and in those aged 5-7 month-old there has been also an increase in the gamma-globulins. The biochemical indices and the morphologic changes have not in all cases been directly dependent on the age of the infected birds, the number of the infective eggs given, and the number of the Heterakis helminths that have survived. Heterakis injection caused by a greater number of eggs is present by worms of a smaller size. Chickens infected at the age of more than five months have worms among which the female samples are considerably more than the male ones as compared with the respective numbers found in one- to 4-month-old birds.
已发现，仅在感染性虫卵数量较少（10个和50个）的情况下，1至7个月龄鸡体内异刺线虫的存活率直接取决于进入鸡体内的异刺线虫卵数量。在虫卵数量相对较多（500个和2500个）时，3至4月龄鸡的存活率最高，且该年龄组的形态学变化表现最为明显。研究表明，3至4月龄鸡的最高存活率对应着白细胞计数和γ球蛋白量的最弱增加。在1至2月龄鸡中，异刺线虫感染导致白细胞计数大幅增加，而在5至7月龄鸡中，γ球蛋白也有所增加。生化指标和形态学变化并非在所有情况下都直接取决于受感染鸡的年龄、给予的感染性虫卵数量以及存活的异刺线虫数量。由较多虫卵引起的异刺线虫感染表现为较小尺寸的虫体。与1至4月龄鸡中发现的相应数量相比，5个月龄以上感染的鸡体内，雌性虫体数量比雄性虫体数量多得多。
