Studies on effect of different light source on growth and heat shock protein 70 expression in commercial broiler
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Date
2006-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The experiment was conducted for a period of 6 weeks to evaluate the effects of fluorescent and incandescent light on growth performance, stress response and cost effectiveness. Two hundred commercial broiler chicks were randomly divided into two equal groups. Group I was provided fluorescent light and group II was under incandescent light. Except for first 3 days an 18L:6D regimen with 15 to 20 lux light intensity was maintained throughout the experimental period. Body weight, feed intake were measured and feed conversion ratio, performance index were calculated at weekly intervals up to 6 weeks. Blood samples were collected on 21st and 42nd day of experiment for estimation of cortisol and expression of HSP70. Electrical energy expenditure by the light sources was calculated and profit/loss statement was made after the end of experiment. The results of the experiment indicated that there was significant (P<0.05) improvement in FCR and performance index of broilers under fluorescent light source as compared to incandescent light source from 2nd week onward up to 6th week of age. Significantly (P<0.05) higher body weight was observed under fluorescent light during 5th (1351.20±13.39 g) and 6th (1885.60±15.63 g) week of age. Weekly weight gain was unaffected by fluorescent and incandescent light source but overall weight gain (1840.56±15.76 g) was significantly (P<0.05) higher in fluorescent light. Average daily feed consumption was statistically similar in both experimental groups. In relation to stress response both light source had no appreciable difference in plasma cortisol level and HSP70 expression. As energy expenditure and FCR values were significantly lower in fluorescent light, profit per bird from this group was (Rs. 4.88) more than the bird under incandescent light. It can be concluded from the present investigation that the fluorescent light substantially improves the final weight, FCR and performance index as compared to incandescent light.
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