Thermoregulatory Responses of Bunaji, Wadara and Friesian X Bunaji Cattle fed Dietary Organic Antioxidant under Tropical Environment
The research was conducted at Dairy Research and Development Centre (DRDC) of Abubakar Tafawa Balewa University, Bauchi. The study was carried out to evaluate the effect of organic antioxidant (Selenomethionine (SeMet)) supplementation on thermoregulatory indices of lactating Bunaji, Wadara and Frisian x Bunaji cattle. A total of 24 clinically healthy lactating cows on their first and second parity were used for the research. The experimental cows were allotted to four treatment diets: 0.00, 30.00, 60.00 and 90.00 mg/100kg diet (diet 0, diet 1, diet 2 and diet 3) of SeMet with six animals per treatment in a Completely Randomized Design and the data was subjected to analysis of variance of SPSS software. The treatments were administered once daily (10 to 20 minutes) before milking and lasted for 186 days. Thermoregulatory parameters were measured from 10: 00 to 12:00 pm and recorded on daily basis from experimental animals throughout the period of the studies. Highly significant (P<0.001) difference for breed, parity and diet were observed on RR, RT, PR and ST, respectively. Friesian x Bunaji crosses recorded higher values for thermoregulatory indices compared to Wadara and Bunaji which indicate poor heat regulatory mechanism. In conclusion, SeMet inclusion in the diet of lactating cows, was significantly effective in reducing thermal stress indicators than in control group (RT 38.99 to 37.94 ºC) respectively. It is recommended that, under tropical conditions Supplementation of SeMet should be included in the diet of lactating cows as antioxidants and constituent of glutathione peroxidase at the rate up to 90.00 mg/100 kg diet without any deleterious effect.
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