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수컷 자바리 Epinephelus bruneus에 있어서 hCG 투여에 따른 혈중 성호르몬 및 정자 활성도 변화
김효원(Hyo-Won KIM),김정현(Jung-Hyun KIM),박진우(Jin Woo PARK),정민환(Min Hwan JEONG),지승철(Seung-Chul JI),김재훈(Jae-Hoon KIM),서병부(Byoung Boo SEO),김대중(Dae-Jung KIM) 한국수산해양교육학회 2021 水産海洋敎育硏究 Vol.33 No.4
This study compared the milt volume, spermatocrit, and sex steroid hormone levels in the blood, and sperm motility and velocity in male longtooth grouper (Epinephelus bruneus), with the application of human chorionic gonadotropin (hCG). The experimental group was injected with 500 IU hCG/kg body weight, whereas the control group was injected with saline solution (0.9% NaCl). The results indicated the former showed significantly higher levels of milt volume and spermatocrit than the latter, whereas sperm motility and velocity showed no significant differences between the two groups. Regarding the analysis of sex steroid hormone levels in the blood, the plasma testosterone (T) and 11-ketotestosteorne (11-KT) levels of the group with hCG was significantly higher than those of the control two and seven days after the injection respectively. Therefore, hCG administration increased the plasma sex steroid hormone levels (T and 11-KT) and sperm volume of male longtooth grouper, whereas it had no effect on the sperm quality (i.e., motility and velocity). In follow-up research, the fertilization and hatching rates based on the sperm analysis will be compared and investigated to provide basic data for breeding in this species.
hCG 농도 및 투여 간격에 따른 양식산 수컷 뱀장어(Anguilla japonica)의 성성숙유도 효과
김효원(Hyo-Won KIM),김정현(Jung-Hyun KIM),김대근(Dae-Guen KIM),정민환(Min-Hwan JUNG),지승철(Seung-Cheol JI),양상근(Sang-Geun YANG),안철민(Chul-Min AHN),명정인(Jeong-In MYOUNG),김대중(Dae-Jung KIM) 한국수산해양교육학회 2018 水産海洋敎育硏究 Vol.30 No.5
The sexual maturation of the male eel can be induced by injection with human chorionic gonadotropin (hCG). However, sexual maturation via hCG injection results in the irregular production of low quality sperm. Low quality sperm have issues with low fertilization and development rates, even when fertilizing good quality eggs. For the stable production of fertilized eel eggs, the development of an effective technology for the induction of sexual maturation in male eels is needed. The current study used varying hCG concentrations (1 IU/g body weight (BW) or 5 IU/g BW), and injection intervals (once a week or twice a week) for the artificial induction of sexual maturation, in order to observe the treatment effects on the quantity and quality of male eel sperm. In addition, the milt from eels obtained after induction of sexual maturation was collected to compare and analyze the production periods, production volumes, motility, and velocity of the sperm. There was no significant difference in sperm motility or velocity with varying hCG concentrations or injection intervals. However, the treatment group with once weekly injections of 1 IU/g BW hCG began sperm production at 7 weeks, while the treatment group with once weekly injections of 5 IU/g BW hCG began sperm production at 6 weeks. The treatment groups that were injected twice per week with either 1 IU/g BW or 5 IU/g BW hCG began sperm production earlier than the other groups, at 5 weeks. The treatment group with weekly injections of 5 IU/g BW hCG had a sperm production volume of 55.3 ml, higher than those of other treatment groups.