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|Title:||IMPACT OF HEAT STRESS ON PRODUCTION AND HEALTH OF VANARAJA BIRDS|
|Abstract:||The present investigation was aimed to study the effect of heat stress (THI: 86; 4 Hrs. Daily for 28 to 35 days) on growth and physiological parameters, gut health and immuno-competence of Vanaraja birds and male fertility of their parent line along with subsidiary evaluation of heat-stress ameliorative properties of Oxycure, a mineral and vitamin supplement and Aloe vera leaf powder (0.5 % in feed) in Vanaraja birds. Significant (P≤0.01) negative impact of heat stress was observed on feed intake, weight gain, FCR and carcass traits of Vanaraja birds. Oxycure supplementation has significantly (P≤0.01) improved the feed intake, weight gain, FCR and carcass traits of heat-stressed birds. The mean cloacal temperature and respiration rate have significantly increased on exposure to heat-stress with no apparent impact of Oxycure supplementation. Respiration rates returned to normal within one hour post exposure. The impact of heat stress was evaluated on Vanaraja parent line roosters in terms of semen quality and quantity, without any subsidiary evaluation of feed supplements. There was no significant impact of heat-stress on ejaculate volume and sperm concentration. However, heat-stress has had a significant (P≤0.01) negative impact on seminal attributes such as per cent motility and live sperm; sperm viability and susceptibility of sperm to free-radical damage. Further, the semen from heat stressed roosters yielded lower but non-significant per cent fertility and hatchability. The effect of heat-stress on gut health and immuno-competence of Vanaraja birds was studied along with subsidiary evaluation of heat-stress ameliorative properties of Oxycure and Aloe vera leaf powder (0.5%). The magnitude of humoral immune response decreased significantly after four weeks of heat exposure and there was marginal improvement in the immune response as a result of dietary supplementation of Oxycure. The cell mediated immunity decreased significantly on exposure to heat stress and dietary supplementation of either Oxycure or Aloe vera did not show any significant improvement. Both duodenal and ileal mean villi heights were significantly (P≤0.01) greater in non heat-stressed birds fed Aloe vera supplemented feed. Supplementation of feed with either Aloe vera or Oxycure yielded relatively higher duodenal and ileal villi heights and villi height to crypt depth ratios in heat-stressed subjects. Heat-stress has resulted in increased number of harmful bacteria (E. coli and Salmonella) and decreased number of probiotic bacteria (Lactobacillus) in the intestines and Aloe vera supplementation has relatively improved the gut microflora in heat-stressed birds.|
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|2018 D612 M.Harsha PG VPY.pdf||3.16 MB||Adobe PDF||View/Open|
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