First, the palatability aspect of feed
1, dry and wet issues
Now there are three types of feeds for pigs: dry powder, wet mix (water 1:1), and thinner. According to experiments, feed intake by wet mix is ​​the best, and worst feed is worst.
2, smashing granularity
Corn grain size requirements of 0.8 mm - 1.5 mm better, if too coarse, the utilization of feed decreased, causing waste; too fine, long time may cause gastrointestinal ulcers, is not conducive to health, while the fine material palatability also decreased, so that Affects feed intake.
3, crude fiber content levels
If the content of crude fiber in the feed is more than 6%, the feed intake of pigs will decrease.
4, salt
The salt requirement for normal grower pigs is 0.45%. If salt falls from 0.45% to 0.2%, the feed intake of pigs can be reduced by 20% and the weight gain can also be reduced by 38%.
5. Sweeteners
The taste of pigs is very developed. The number of taste buds in the tongue is three times higher than that of humans. Pigs prefer the sweet taste. If the feed contains sweeteners, the feed intake rises.
Second, changes in the smell of feed can also affect the pig’s intake.
The pig's sense of smell is so well developed that it is very sensitive to the changes in feed odors and thus affects the intake of food.
1. Changes in flavoring agents such as the conversion of frankincense, surimi-type, fish-flavored, and sweet-smelling types, or exposure to air for too long, will make the odor less volatile, and will affect their intake.
2. Feed moldy and degenerate If the feed is contaminated by mold, the feed will mold and produce moldy taste. Both the odor and palatability will reduce the pig's feed intake.
3, feed rancidity high ambient temperature or feed storage time, the crude fat in the feed will be oxidized rancidity, there is what we commonly call the Hacha taste, so that feed intake decreased.
4, the different types of oil and fat, such as soybean oil, corn oil, etc. added to the feed, the smell is not the same, if it changes, it will affect the amount of feed intake.
5. The influence of special odors of other raw materials on the feed, such as the content of fishmeal, the quality, and the like.
Third, some feed ingredients directly affect the physiological response of pigs, resulting in a decrease in feed intake.
1. Amino acid deficiency or imbalance in feed amino acids has a greater impact on pig feed intake. Experiments have shown that the feed intake of pigs increases with the increase of lysine levels in the feed, but feed intake tends to decrease after a certain degree.
2. Minerals The lack of zinc and phosphorus in the feed and the excess of calcium, manganese, iodine, and iron can all result in poor appetite.
3, vitamins B1, B2, B12 and the lack of niacin, pantothenic acid will make feed intake of piglets decreased, such as B1 deficiency, will affect the TCA cycle in pigs, so that a large number of propionic acid accumulation in the body, and damage to digestion System, affecting appetite.
4. A large number of antibiotic tests have shown that adding a small amount of antibiotics to pig diets can increase pig feed intake by 7%-15%.
5. Water: Water is the source of life. Water is also a necessary substance for transporting nutrients. In the early period of water shortage, the appetite of pigs significantly decreased, and in particular they did not like to eat dry powder. With the increase of water loss, the appetite of pigs may be completely eliminated.
6, energy content of feed energy content of high feed intake is low, on the contrary low energy intake is high. In addition, some pig diseases such as parasitic diseases, colds, gastroenteritis, etc., changes in pig house temperature, swarming, laps, restocking, and epidemic prevention during the pig raising process will affect the feed intake of pigs. .
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