| Popis: |
The new mineral additive “Aleksanat-Zoo” contains mineral elements (Ca, Mg, Fe, Zn, I, Si, Cu) in micellar form, which significantly improves their assimilability. The aim of our work was to study the indices of homeostasis and indicators of sperm production of Holstein stud bulls. Studies were carried out with two groups of bulls of 6 heads each. The animals of the experimental group received 300 ml of supplement daily for 90 days. We recorded an increase in experimental bulls’ serum of Ca content from 1.78 ± 0.08 mM to 2.15 ± 0.14 mM (by 20.78%) and a decrease in magnesium level to reference values from 1.46 ± 0.07 to 0.98 ± 0.03 mM (by 32.87%). The hormonal status of animals had changed: the level of free triiodothyronine increased (from 13.47 ± 2.31 pM to 18.34 ± 3.14 pM) and free thyroxine (from 19.35 ± 0.58 mM 20, 53 ± 0.92 mM) by 36.15% and 6.10%, respectively. The sum of these hormones in the serum of bulls receiving the supplement increased by 18.3% (32.87 ± 4.32 vs. 38.84 ± 4.95 pM). Testosterone level increased from 13.98 ± 2.89 nM to 30.49 ± 7.50 nM (more than 2 times) and the estradiol level from 0.43 ± 0.06 nM to 0.51 ± 0.06 nM (by 18.6%). Estradiol-testosterone ratio decreased from 0.03 ± 0.06 nM to 0.01 ± 0.02 nM. The volume of bulls’ ejaculate from the experimental group increased from 4.06 ± 0.20 to 5.52 ± 0.17 ml (by 35.96%). The concentration of spermatozoa in ejaculate increased from 0.99 ± 0.70 to 1.44 ± 0.52 billion/ml (by 45.4%). We obtained 46.7% more doses of frozen semen from bulls than we received from them prior to the experiment (1050.50 ± 132.04 vs. 1541.01 ± 117.07 pcs). In conclusion, the use of the new mineral additive “Aleksanat-Zoo” has a positive effect on homeostasis and sperm quality of stud bulls. *p < 0.01 |
