Effect of various forms of zinc application on gonad development in breeding cocks
1998
Suchy, P. | Strakova, E. | Illek, J. | Simon, M. (Veterinarni a Farmaceuticka Univ., Brno (Czech Republic))
The effect of continual peroral application of zinc in various forms on gonad development in breeding cocks was studied in the period of their sexual maturation. All cocks received the same complete feed mixture but the control group (K) received 30.4 mg Zn per kg of feed, which corresponded to a natural Zn content in feed. Zn content was supplemented to the value 100 mg/kg feed in experimental groups: P1 - ZnSO4, P2 - ZnO, P3 - MINVITAL Zn, P4 - BIOPLEX Zn. An experimental period was from 10th to 25th weeks of cock age. The results showed different effects of various forms of zinc on gonad development in breeding cocks during their sexual maturation. The various forms of zinc did not significantly influence live weight of breeding cocks in the experimental period, when average live weight increased from 1,049 g to 2,573 g in K group, from 1,081 g to 2,732 g in P1, from 1,110 g to 2,652 g in P2, from 1,054 g to 2,595 g in P3 and from 1,030 g to 2,716 g in P4. The effect of the various forms of zinc was evident mainly from the 20th week of age, when the average weight of gonads was substantially (except P1) and highly significantly different in experimental groups if compared to the control.
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