Chinese donkeys originated from Asian wild donkeys. They are distributed in the west of China and Asian regions, India, Arabia and other Asian inland regions. Among them, Tibetan wild asses and Mongolian wild donkeys were captured and domesticated since childhood to form donkeys. At the beginning of the introduction, they mostly concentrated in the Guanzhong area, and gradually spread to the north and east. As one of the draught animals, the donkey was once spread throughout the Central Plains and semi-agricultural areas.
Feeding and management When cooperating with the male donkey, it is necessary to reduce the proportion of fodder, increase the proportion of concentrates, and control the energy feed, so that the concentrates account for 1/3-1/2 of the total amount in the diet. When the mating task is large, animal and mineral feeds such as eggs, milk, fish meal, stone meal, and calcium dihydrogen phosphate must be added. In order to meet the requirements of semen quality at the time of mating, feeding should be strengthened at 1-1.5 months before the start of breeding to improve feed quality.
General large donkeys in the non-matching period, the daily feeding of grass or high-quality hay 5-6 kilograms, 1.5-2 kilograms of fine material; medium-duty donkey 3-4 kilograms of hay on the day, fine material 1-1.5 kilograms. 1 month before entering the breeding period, start reducing grass and feeding, to meet the breeding standard of diet: large donkeygrass 3.5-4 kilograms, fine material 2.3-3.5 kilograms, of which not less than 25% -30% soybean cake or beans, lack of early spring For high quality hay, 1 kg of carrots or 0.5 kg of barley malt should be replenished each day.
To enhance physical fitness, it is necessary to handle well-balanced and balanced relationships between male nutrition, sports and breeding. The task of breeding can reduce the weight of the exercise and increase the protein feed. If the mating task is light, the exercise can be increased or the fine material can be reduced appropriately to prevent the male donkey from becoming fat. Exercise is generally performed with light exercise or riding. It can also be driven on a rotary exercise rack for 1.5-2 hours. Exercise can improve sperm motility, but 1 hour before and after mating (seizure), to avoid strenuous exercise, with 20 minutes after the match. The male donkey can be used for sports at the other time except for feeding time.
Normal breeding (seed collection) should be done once a day, once a week for a week, and occasionally once a day for two times, with an interval of more than 8 hours. The young male donkey's breeding frequency should be less than that of a young male donkey. In short, the number of breedings depends on the result of the semen quality test. Over-breeding will reduce semen quality, affect fecundity, and cause infertility. It will also shorten the service life of the male donkey.
The main functions of sweeteners in food are as follows [2]:
(1) Taste: Sweetness is one of the indicators of many foods. In order to make food and beverages taste palatable, a certain amount of sweetener needs to be added.
(2) For the adjustment and enhancement of flavor, sweetness is generally required in cakes; in beverages, there is a "sugar-acid ratio" for flavor adjustment. Sweeteners allow products to achieve good flavor while retaining fresh flavor.
(3) The formation of flavor, sweetness and the flavor of many foods are complementary to each other, and the flavor of many products is produced by the combination of flavor substances and sweeteners, so many foods are added with sweeteners.
Food additives sweeteners Neotame, Sucralose
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