不同产蛋阶段藏鸡与罗曼粉、 海兰褐蛋鸡生殖系统解剖生理特性的比较研究.

In order to investigate the anatomical and physiological basis of the difference in egg production between Tibetan chickens and high laying hens (Romain pink and Hyline brown), the changing patterns of serum Follicle-stimulating hormone (FSH) and estrogen (E2) values, oviduct development anatomy and histology of the three species of chickens were investigated during an egglaying cycle, which provided theoretical bases for further understanding and development of egglaying performance and reproductive performance of Tibetan chickens. Three groups were divided according to breeds, and 80 birds each of Tibetan chickens, Romain pinks and Hyline browns were selected in the pre-laying period, laying period, peak laying period and post-laying period (16, 25, 36 and 68 weeks, respectively), and the levels of serum FSH and E2 hormones of the three kinds of chickens were measured at different periods of time; 20 chickens were randomly selected at each weekly age section, and the development of the oviducts and the histological characteristics were observed. The results showed that: ① inter-group comparison showed that there was a significant difference between the serum FSH levels of Tibetan chickens and Hyline Brown group at the late stage of egg laying (P<0.05), while the difference between them and the FSH levels of Romaine Pink and Hyline Brown at other periods was not significant (P>0.05); intra-group comparison showed that the serum FSH levels of chickens of the three groups were highest in the peak period of egg laying, and the difference with that of the early stage of egg laying was significant; serum E2 levels of the three groups of chickens showed that there was a significant difference in the peak period of egg laying, and the difference was significant; and the difference between them was significant. levels between groups showed that in the four periods of Tibetan chickens serum E2 levels differed significantly (P<0.05) from those of Roman pink and Hyline brown hens, where the differences in serum E2 levels between Roman pink and Hyline brown hens were not significant (P>0.05); within-group comparisons showed that E2 levels were highest in the peak laying period, and the differences with the pre-laying period and the late laying period were significant (P<0.05); ② Tibetan chickens' oviduct lengths, weight were significantly different from those of the other two groups at different egg-laying stages (P<0.05); intra-group comparison showed that the length and weight of oviducts in the peak egg-laying period of the three groups of chickens were significantly higher than those in the pre-laying period and the post-laying period (P< 0.05); ③ the mucosal folds of oviducts of Tibetan chickens were significantly lower than those of the other two groups in the various laying stages in terms of mucosal folds' heights and widths (except for the width of mucosal folds of isthmus at the pre-laying period) (P<0.05). Reproductive hormone levels of Tibetan chickens differed from those of high-yielding Roman Pink and Hyline Brown hens at different egglaying stages, which in turn caused anatomical and histological differences between Tibetan chickens and the other two types of laying hens. The development of reproductive hormones and oviducts is closely related to the egg-laying performance of chickens, therefore, to improve the egg-laying performance and reproductive performance of Tibetan chickens, it is necessary to further find the exogenous and exogenous factors that regulate the secretion of reproductive hormones in Tibetan chickens. [ABSTRACT FROM AUTHOR]