Study on breeding technique of frogs (Rana tigerina)
2001
Thongyun Thongkhlongsai(Rajamangala Institute of Technology. Kalasin Campus, Kalasin (Thailand). Faculty of Fisheries) | Withaya Kingko(Rajamangala Institute of Technology. Kalasin Campus, Kalasin (Thailand). Faculty of Fisheries)
This experiment eas conducted to investigate the Proper method in improving breeding ability of frogs. Twelve pairs of mature (11 month of age, 120 and 200 g. Bodyweight for male and female, respectinely) frogs were used. The experimental treatments were, natural breeding, water spraying, water spraying+pituitary extract injection, Suprefact (Synthetic homone) injection+water Spraying. Four 2*2*1.2 m concrete Ponds with floating morning glory and 5 cm. Water lever were employed. The results showed that breeding ability of the frogs varied depending on seasons. In rainy season (22 deg C), breeding behavior of the frogs in all treatments were not different. During the summer (38 deg C), While the natural breeding did not occur, The pituitary extract injection+water spraying and the suprefact injection+water spraying desire of the frogs, i.e. 66.66 percent frogs. Were mated when they were in the former and latter condition, respectively. In the other hand, breeding behavior of all frogs were not observed during the winter (14 deg C). In rainy season, the earliest ovulation occurred with the frogs injected with Suprefact (5 h after the injection). The number of baby frogs measured at 7 days of age were: 3,862 2,499 1,899 1,845 for the water spraying, natural breeding, Superfact injection and Pituitary extract injection groups, respectively. During the summer, the earliest ovulation occurred with the frogs injected with Suprefact (6 h 38 min after the injection). The number of baby frogs measured at 7 days of age were 1,012 616 430 for the water spraying, Suprefact injection and pituitary extract injection groups, respectively.
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