Comparative Study of Hormonal Stimulation of HCG, PG extract and Ovaprim on Thermal Accumulation Period and Egg Production in Grass Carp Ctenopharyngodon idella
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Abstract
Three types of hormonal stimulation using HCG, PG extract, and Ovaprim were tested to induce egg production and accelerate the Thermal Accumulation Period (TAP). The results showed a direct relationship between the type of hormone used and TAP. Fish receiving PG extract had the shortest TAP, which was significantly different from those receiving HCG and Ovaprim treatments. TAP values ranged between 258.97, 344.67, and 322.78 °C-hour in fish injected with PG extract, HCG, and Ovaprim, respectively.
The results also showed noticeable variation in egg production among fish receiving different hormonal treatments, with clear superiority observed in fish injected with PG extract compared to those receiving HCG and Ovaprim. The lowest weight of extracted eggs (7.3 g/kg) was recorded in fish injected with HCG, whereas the highest egg yield (139.7 g/kg) was obtained in fish treated with PG hormonal extract.
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