The effect of feeding calcium salts of vegetable oils on the blood antioxidant indices and level of metabolism related hormones in fattening lambs under heat stress
Subject Areas : ZoologyAhmad Seyedainnia 1 , Ali Asghar Sadeghi 2 * , farahnaz Motamedi 3 , Mohammad Chamani 4 , Parvin Shawrang 5
1 - PhD student, Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 - Associate professor, Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 - Associate professor, Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, Karaj, Iran
4 - Full professor, Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran
5 - Associate professor, Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, Karaj, Iran
Keywords: liver enzymes, fattening lamb, protected fat, glutathione peroxidase, malondialdehyde,
Abstract :
Aim: One of the suitable method to ameliorate the negative effect of heat stress is to use energy sources that improve the antioxidant capacity of the body. The effects of calcium salts of oils on growth parameters and reproductive performance have been studied, but limited information is available about the effects of these energy sources on antioxidant indices and blood hormone concentrations. Therefore, the aim of this study was to evaluate the effects of calcium salts of palm oil, corn oil and linseed oil on antioxidant indices and the level of metabolism related hormones in the blood of fattening lambs under heat stress. Materials and Methods: Eighteen fattening lambs were divided into three experimental groups and six replicates in a completely random design. Three experimental diets containing 4% calcium salt of oils including palm oil, corn oil and linseed oil were prepared and fed to fattening lambs for 40 days. On the last day of the experiment, blood samples were collected from the jugular vein. The concentration of malondialdehyde, total antioxidant capacity, activity of aspartate aminotransferase and alanine aminotransferase enzymes and the level of metabolism related hormones were measured. Results: The level of malondialdehyde in the plasma of lambs fed with calcium salt of linseed oil was lower and its antioxidant capacity was higher than the other groups (P0.05). The highest blood glucose concentration was observed in the group receiving calcium salt of corn oil (P<0.05). Cortisol concentration in blood plasma of lambs receiving calcium salt of corn oil was higher than lambs receiving linseed oil (P<0.05). The lambs receiving the calcium salt of corn oil had higher concentrations of triiodothyronine and tetraiodothyronine than the other two groups. Conclusion: The application of calcium salts of linseed oil in ruminants feeding is preferable to calcium salts of corn oil, as it improves the antioxidant indices and improves the liver health. The use of calcium salt of palm oil is also preferable to corn oil, and although palm oil did not improve the activity of antioxidant enzymes, it did not have negative effects on the liver and metabolic hormones.