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RISS 인기검색어
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- 저자 : 이용빈 ( Chang Keun Kim (검색결과 1 건)
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산란중 Testosterone Propionate 처리가 계배자와 병아리의 발육 , 생식기 및 갑상선발달에 미치는 영향
김창근,이용빈 ( Chang Keun Kim,Yong Bin Lee ) 한국축산학회 1978 한국축산학회지 Vol.20 No.1
These experiments were conducted to study the effects of testosterone propionate (TP) treatment during incubation on the embryonic (Experiment 1) and postnatal (Experiment 2) development of body, genital organs and thyroid gland in chicken. In the experiment L, RIR embryos treated with TP at the 2nd or 10th day of incubation were observed at 10, 14 and 18-day stage. In the experiment 2, RIR(♂) × Columbian Plymouth Rock(♀) chicks hatched from TP-treated eggs at the 10th day of incubation were observed at monthly intervals from 1 to 5 months of age. The results obtained in the experiment 1 and 2 are summarized as follows: Experiment 1. 1. The weight of embryo after TP treatment was found to be distinctly different between the control and TP-treated group at the 2nd day treatment than at the 10th day treatment of incubation ana the reduction of embryo weight was greater at the higher levels of TP. Especially, this reduction of male embryo weight was somewhat larger than that of female throughout all stages of incubation and the weight of 18-day embryo was significantly smaller in all TP-treated groups than in the control group. The length of using and leg of male and female embryo was considerably shorter at the latter half period of incubation in the TP-treated groups and the development of these parts were more retarded at the 2nd day treatment of TP. 2. The embryonic mortality from the day of TP treatment to 18-day stage was exceptionally higher in the 2nd day treatment than in the 10th day treatment, the percentage of which was 52.3∼60.5% for the 2nd day treatment with 1∼2㎎ TP and 30.7∼40.2% the 10th day treatment with 3∼4㎎ TP. More than 60% of dead embryos appeared to be dead within a few days after TP treatment. 3. The reduction of testis size of embryo related to TP treatment was more remarkable at 14-day stage than at 18-day stage and in the testis size at 18-day stage, no significant difference was observed between the control and TP-treated group, except for the higher levels of TP. When the embryos were treated with the high levels of TP the volumetric proportion of seminiferous tubules in 14 and 18-day embryo testes was. smaller than those of control group, while the diameter of tubules in the TP-treated groups was only smaller at 18-day embryo. 4. The size of left ovary in the TP-treated embryo was smaller in the 2nd day treatment than in the 10th day treatment. The ovary size at 14 and 18-day stage was smaller in all TP-treated groups than in the control group and the ovary size of 18-day embryo treated at the 2nd day of incubation was not especially increased compared with that of 14-day embryo. In the 2nd day treatment the cortex thickness cf left ovary of 14 and 18-day embryo was thinner in the higher levels than in the lower levels and was inactive in the division of germ cells and in the development of secondary sex cords in the cortex. 5. The length of left oviduct in the 14 and 18-day embryo was shorter only in the groups treated with higher levels of TP. However, the reduction of length of right oviduct was similar to those of control throughout the stages of embryo, although the length of oviduct was more reduced in 2㎎ TP-treated group at the 2nd day treatment. The regression of right oviduct was not affected by TP treatment. 6. The thyroid weight of 18-day embryo was not different between sexes and the reduction of thyroid w eight was greater at high levels of TP treatment. The follicle size of embryo thyroid was smaller in the TP-treated groups than in the control group at the 2nd and 10th day treatment and the epithelial cell height of embryo thyroid was not found to be distinctly affected by the time or level of TP treatment. The size of bursa of Fabricius in 18-day embryo was significantly smaller in all TP-treated groups than in the control group. The regression of bursa was larger in the 2nd day treatment and in male embryo and showed difference among TP treated groups in both sexes.
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