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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of 17 Alpha-Methyltestosterone on Growth, Survival and Sex Reversal of Thai Walking Catfish, Clarias macrocephalus ) ผู้เขียน: ดร.อุทัยรัตน์ ณ นคร, ศาสตราจารย์ ,  Rex A. Dunham, ประทักษ์ ตาบทิพย์วรรณ สื่อสิ่งพิมพ์:pdf AbstractFry of Clarias macrocephalus were fed at first feeding with water fleas (Moina sp.) immersed for 20 minutes in 200 ppm or 400 ppm MT for 15 days. The groups fed water flea (200 ppm MT) were fed a diet containing 30 mg MT and the groups fed water flea (400 ppm MT) were fed 60 mg MT, for the additional 15 or 45 days. Results indicated that administration of MT did not affect growth (P>0.05) at 33 days but retarded growth at 63 days of all treated groups. Growth of treated groups was increasingly suppressed with increased dose and duration of treatment. Administration of MT lowered survival rate at 33 days (P<0.05). Survival from day 33-63 was unaffected by the hormone application. Ovotestes were found in the groups treated with 30 and 60 mg MT for 60 days. In general, sex reversal to maleness was not accomplished, and with increasing dose and duration there appeared to be paradoxical feminization. Alternatively, MT may have prevented gonads of genetic males from differentiation or caused the formation of ovotestes in genetic females. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Sex Reversal in Tawes Puntius gonionotus by Oral Administration of Methyltestosterone) ผู้เขียน:ดร.อุทัยรัตน์ ณ นคร, ศาสตราจารย์, Jamjun Sangsri สื่อสิ่งพิมพ์:pdf AbstractAn androgen, 17 alpha methyltestosterone (MT-Sigma), was orally administered to 7 14 days old tawes, Puntius gonionotus at the dodages of 0, 30, 60 and 120 mg/kg diet with treatment durations of 30 or 60 days. Growth reduction was observed during the first month in the groups treated with either 60 or 120 mg MT/kg diet. Hormone treatments did not affect the survival at 5 months. The administration of MT for 30 days enhanced sex reversal to male in some treated fish. Hormone treatment for 60 days resulted in high level of sterility regardless of dose or timing. The treatments initiated at 14 days post-hatch were more effective than those started at 7 days after hatching. The gonads of sex reversed fish showed typical anatomy of ovary but contained various stages of spermatogenic cells including spermatozoa. The sterile area in which no recognizable germ cells were detected, was observed in the sex-reversed gonads. |
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ที่มา:มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:ศึกษาการเปลี่ยนแปลงเนื้อเยื่อรังไข่และอัณฑะปลาหางนกยูงแปลงเพศด้วยสารสกัดใบมังคุด |
ผลงานตีพิมพ์ในวารสารวิชาการPubertal effects of 17 alpha-methyltestosterone on GH-IGF-related genes of the hypothalamic-pituitary-liver-gonadal axis and other biological parameters in male, female and sex-reversed Nile tilapiaผู้แต่ง:Phumyu, N, Boonanuntanasarn, S, Jangprai, A, Yoshizaki, G, Dr.Uthairat Na-Nakorn, Professor, วารสาร:  
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ที่มา:สถาบันวิจัยและพัฒนา มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:ศึกษาการเปลี่ยนแปลงเนื้อเยื่อรังไข่และอัณฑะปลาหางนกยูงแปลงเพศด้วยสารสกัดใบมังคุด |
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