Influence of dietary thyroxine in deccan mahseer (Tor khudree Sykes) juveniles: Effect on growth performance and feed utilization

The present study was conducted to investigate the effects of dietary thyroxine levels on growth performance and feed utilization of deccan mahseer juveniles. Under the experiment 5 replicate groups were fed 4 diets with increasing levels of thyroxine (0, 0.05, 0.075 and 0.10 mg/kg of diet) for 180...

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Bibliographic Details
Published in:Indian journal of animal sciences 2010-10, Vol.80 (10)
Main Authors: Basade, Yasmeen, Kohli, M.P.S
Format: Article
Language:English
Subjects:
http://www.fao.org/aos/agrovoc#c_40222
http://www.fao.org/aos/agrovoc#c_5274
http://www.fao.org/aos/agrovoc#c_7755
NUTRIENTES
NUTRIENTS
SUBSTANCE NUTRITIVE
THYROXINE
TIROXINA
TOR KHUDREE
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Summary:The present study was conducted to investigate the effects of dietary thyroxine levels on growth performance and feed utilization of deccan mahseer juveniles. Under the experiment 5 replicate groups were fed 4 diets with increasing levels of thyroxine (0, 0.05, 0.075 and 0.10 mg/kg of diet) for 180 days. The weight gain (%), specific growth rate (SGR), feed conversion efficiency (FCE), protein efficiency ratio (PER), nutrient and gross energy efficiency, apparent digestibility coefficient (ADC) of protein and lipid were significantly higher in fish fed with lower level of thyroxine (0.05 mg/kg of diet) and significantly decreased in response to the increasing levels of dietary thyroxine (from 0.075 to 0.10 mg/kg of diet). The survivability of fish too at higher dose was significantly lower. In fish fed on low dietary thyroxine level digestive enzyme activity, viscero-somatic index (VSI), hepato-somatic index (HSI) and reno-somatic index (RSI) values were high and cranio-somatic index (CSI) value was low. Whole body protein, lipid and gross energy content and muscle RNA/DNA ratio followed a similar pattern as growth parameters in relation to dietary thyroxine levels. Suggesting that thyroxine at a lower dosage accelerated growth performance and feed utilization in deccan mahseer juveniles.
ISSN:0367-8318