2. The balance of minerals, trace elements and vitamins.
3. The effect of the length of time and uniformity of feed allocation on the feed composition and the hazards to the breeding and management of breeding bulls (usually 10 days or so with a single material is reasonable).
4. Differences in feeding of individuals and breeds:
1 Adjust feed intake based on individual growth rate.
2 Based on sexual desire, semen quality, adjust energy, trace elements and vitamin supply.
5. The harm to the health of breeding bulls by iron wire and impurities in feeding grain.
6. Effects of changes in seasons and feed composition on fertility of bulls. The average estrus rate of semen produced in spring and summer was 74.2%, which was significantly lower than that of semen recovered from autumn and winter 76.2% (p).
7. The correspondence between the growth rate of bulls and their rations. The body condition of the bull requires moderate licking and cannot be too thin or too fat. It is usually weighed once a month in mid-month.
8. Comparison of semen quality and feed composition.
9. Breeding frequency domain breeding management coordination. The bred bull generally collects sperm once a week or once a week, and the adult bull collects 2-3 times a week.
10. Effect of semen collection technology on feeding and management. The breeder must take into account the semen changes caused by sperm extraction when looking for the reasons for changes in semen, otherwise they will analyze the errors.
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