Effect of SOYXYL as a Dietary Protected Protein Supplement on the Reproductive Performance of Simmental Bulls

The study aimedto evaluate the effect of SOYXYLasone ofdietaryprotectedprotein supplementproductin the rationson the reproduction performance of Simmental bulls. Twelve 5-year-old Simmental bulls were allotted to 4 treatment groups with 3 replications each, i.e. T0= control ration (elephant grass + 5 kg/head/day commercial concentrate), T1= control ration + 150 g protected protein supplement SOYXYL (3% concentrate), T2 = control ration + 300 g SOYXYL (6% concentrate) and T3= control ration + 450 g SOYXYL (9% of concentrate). The experiment lasted for 90 days.At the end of the experiment, semen and blood was collected and body weight gain was measured. The measured variables weresperm motility, sperm concentration, blood protein, blood urea and the concentrationof testosterone. The results showed that SOYXYL supplementation particularly at 3 and 6% increased(p<0.05)total plasma protein of bulls. SOYXYL supplementation at 3% from concentrateincreased(p<0.05)plasma urea concentration. Meanwhile, 6% and 9%SOYXYL increased(p< 0.05)the average daily gain of bulls as compared to controlgroup. The bulls' sperm concentration increased (p<0.05)after 3% SOYXYLsupplementationbutdecreased (p<0.05) after6%and 9%treatment. The concentration of testosterone was higher(p<0.05)in the bulls receiving3%and 6% SOYXYL in the rations. Dietary supplementation of SOYXYL increased(p<0.05) the sperm motility of Simmental bulls. In conclusion, dietary supplementation of SOYXYL at the level of 3% ration increased plasma protein, testosterone and sperm concentrations as well as sperm motility. However, 6% and 9% SOYXYL decreased the concentrations of sperm and testosterone.