We all know that there is a shelf life for feed. Generally, the shelf life of feed is 6 months. Different products have different shelf life in different seasons. Therefore, we should observe the shelf life of feed before using feed. If the expired feed is used, it will lead to livestock poisoning and even death; at the same time, the growth of mold in pig feed will consume the nutrition and energy in the feed, reduce and destroy the vitamin, protein and amino acid in the feed, and a very small amount of mold can also damage the flavor of feed, produce putrid odor, and have adverse consequences on animal health. So what's the danger of using expired feeds?
The main hazards of expired feed are as follows:
(1) High levels of harmful microorganisms and mycotoxins can affect animal health
Mold is the common problem in expired feed, mainly caused by Aspergillus flavus, Aspergillus ochraceus, Fusarium graminearum and Penicillium. During the growth and reproduction of mold, a large number of toxins are produced, including aflatoxin, ochratoxin, forma toxin and vomit toxin. After eating, the production performance of animals will decline, which will cause harm to animals in many aspects, even lead to serious death. For example, aflatoxin is a highly toxic substance, which has a strong destructive effect on animal liver. The symptoms of mildewing vary with the degree of mildewed feed, the number of edible animals and the length of time consumed. Mild people suffer from gastroenteritis, diarrhea, and miscarriage of pregnant female animals. Severe people have neurological symptoms and even death.
(2) Expired feed will cause the loss of nutritional value and flavor deterioration
Moldy feed will not only lead to a large number of metabolic toxins produced by mold, but also consume and decompose nutrients in feed in the process of reproduction, resulting in the decline of feed quality. Under the condition of high temperature and humidity, it can stimulate the activities of lipase, amylase, protease and other hydrolases. Under the synergistic action of mold and feed enzyme, the decomposition rate of nutrients in feed can be accelerated and the nutritional value can be seriously reduced. For example, some molds can significantly reduce the content of vitamin B, vitamin E or some amino acids in infected grains. Expired moldy feed can also worsen sensory properties, such as pungent odor, sour taste, color difference, viscous dirt, etc., which seriously affects palatability.
In addition, if there is oil in the feed, the expired feed will easily stink due to season, temperature and other reasons. Feeding these feeds will cause stress to livestock and poultry, and putrid or expired feed contains some small molecular substances such as organic acids and free acids, which can stimulate the nervous system of livestock and poultry, and cause excitations, thus causing adverse reactions of jumping or not sleeping.
There are many hazards of expired feed, so farmers must attach great importance to it and never claim to use expired feed. In the feeding process, feed should be reasonably purchased and properly preserved according to the number and feed intake of the breeding animals, so as to avoid mildew in the feeding process and waste feed after expiration.