The smell of feed The pig's smell is very well developed, and it is very sensitive to changes in feed odor, which affects the feed intake. Changes in the flavoring agent: such as the conversion between frankincense, fish-shaped, fish-flavored, and sweet-smelling, or exposure to air for a long time, lightening of odor evaporation, will affect their feed intake. Feed moldy and degenerate: If the feed is contaminated with mold, the feed will produce a musty smell due to mildew, and the feed intake of pigs will be reduced both from smell and palatability. Feed rancidity: When the ambient temperature is high or the feed is stored for a long time, the crude fat in the feed will be oxidized and rancid and the feed intake of the finishing pigs will be reduced. Oil type: Soybean oil or corn oil is added to the feed. The smell is different. If the added species changes, it will also affect the feed intake of the pig. The special odors of other raw materials, such as the content of fishmeal and the quality, will also affect the feed intake of pigs in varying degrees. Effects of certain feed ingredients Amino acids: Insufficient or unbalanced amino acids in feeds have a significant effect 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. Minerals: The lack of zinc and phosphorus in feed and the excess of calcium, manganese, iodine, and iron can all lead to loss of appetite in pigs. The lack of vitamins: vitamin B1, vitamin B2, vitamin B12, and niacin and pantothenic acid all reduce the feed intake of the pigs. Moisture: Water is the source of life and it is also an essential substance for transporting nutrients. In the early period of water shortage, the appetite of pigs decreased significantly, 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. Energy: The energy content of the feed is high and the feed intake of pigs is low, whereas the feed intake is high.
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Feed factors that affect pig feed intake
Palatability of the feed: Dry powders, wet mixes (water to feed ratio of 1:1), and thinners are now used for feeding pigs. According to experiments, pigs are fed with wet mixes, and the feed intake of finishing pigs is the largest. Feeding with the thinner feed intake is minimal. Grinding particle size: corn crushed particle size is preferably 0.8 to 1.5 mm. If it is too thick, the utilization rate of feed will be reduced, resulting in waste; if it is too fine, long-term feeding may cause digestive tract ulcers in pigs, which is not conducive to health, and at the same time the feed palatability of fine feeds will also decline, which will affect pig feed intake. Crude fiber content: When the crude fiber content in the feed is more than 6%, the pig's feed intake will decrease. Salt: The demand for salt for normal growing 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%. Sweeteners: Pigs prefer to eat sweet. If feed contains sweeteners, feed intake will increase.