1. With regard to improving animal health
1.1. Management of piglets
In addition to selecting excellent hybrid piglets, piglets can be managed in a full-in, all-out manner: pigs of similar weight are simultaneously transferred to a cleaned and sterilized pig house, and all pigs in the same pig house are listed at the same time, in a new batch of pigs. Before entering, all the pig pens in the pig house were emptied, cleaned and fumigated. Before the next batch of pigs enter the house, the whole pig house should be completely cleaned thoroughly. All-in-one feeding management can break the chain of disease between the pigs; the virulence of any disease will not increase; The occurrence of lung injury, reduce the severity of injury; improve the average daily weight gain of the herd; reduce the number of days required for market weight; improve the feed conversion rate; compared with the simple cleaning of a single pigsty, when the entire pigsty is vacated, the cleaning will More efficient; buying piglets for the entire pig house is more efficient than buying pigs for a single pigsty. In the choice of feed, according to the physiological characteristics of piglets, easy to digest and high-nutrient feed should be selected. At the same time, special health care products for piglets can be added to the feed of piglets. The specific method of use: Add “护仔康1†to the feed after weaning. % feeding for 15 days, then add 2% of "Waizi Kang 2" or 1% of "Waizi Kang 1" and 1% of "Waizi Kang 2" to 70 kg in the feed, which can effectively prevent Weaning stress and nutritional stress, improve feed conversion rate, and improve the growth potential and disease resistance of piglets.
1.2. Improve the health of sows.
The health of the sow directly affects the growth of the piglet.
2. About the weaning age
2.2. Another view is that it is necessary to extend the age of weaning. Most of the farmers in Europe use the weaning ages of 24 to 28 days. According to the results of relevant tests and studies, for livestock without antibiotics in the feed, the greater the weaning age, the better the effect. When it is strong, the feed intake will increase. On the other hand, as the age increases, the immune system of the piglets will also improve.
Early weaning techniques for piglets appear on the basis of more reasonable diet preparation, which has a great effect on the use of sows, but early weaning is also likely to cause piglet diarrhea, early weaning stress syndrome in piglets (PWSD) The main clinical manifestations are: weaning piglets feed intake decreased by 15%-20%, growth stagnation (commonly known as milk mites), feeding cycle extended by more than 5 days; diarrhea, diarrhea rate of 30-100%, an average of 50%, serious The mortality rate is 15%; concurrent with edema disease; disease resistance declines. The stress and syndrome of early weaned piglets is a major problem in pig production worldwide. It is commonly known as “weaning offâ€. Clinically, the loss caused by weaning stress of piglets is 150 yuan/well, which causes the Chinese pig industry every year. The economic loss is more than 6 billion yuan.
3. About nutrient digestibility
3.1. Effects of anti-nutritional factors
The feed often contains some anti-nutritional factors, mainly protein inhibitors, carbohydrate inhibitors, mineral element bioavailability inhibitors, antagonistic vitamin action factors, and stimulating animal immune system action factors. They interfere with the digestion, absorption and utilization of nutrients in the feed, affecting the digestibility of nutrients. For example: (1) Bean cake containing trypsin inhibitor, hemagglutinin, can reduce trypsin, chymotrypsin activity, increase trypsin secretion, intestinal wall damage, increase endogenous protein secretion damage, affect growth and death. (2) Peanut cake contains aflatoxin and antitrypsin factor, which reduces the nutritional value of feed and affects growth, leading to chronic poisoning of livestock and poultry. (3) Cottonseed cake contains free gossypol and cyclopropene fatty acid, which affects the effectiveness of lysine and mineral elements. (4) Rapeseed cake contains oxazolidine sulphide and isothiocyanate, which affects iodine utilization, palatability and growth rate, causing goiter and damage, and ester tannin irritating mucous membranes, resulting in diarrhea.
3.2. Utilization of synthetic amino acids
The nitrogen utilization rate in livestock and poultry diets is usually only 30%-50%. To increase the nitrogen utilization rate, the balance of dietary amino acids must be increased. When the essential amino acids in the diet account for 45%-55% of the total nitrogen content, The nitrogen utilization rate is the highest. According to statistics, the amount of nitrogen in the diet calculated by the ideal model is reduced by 10% to 12.5%. The addition of synthetic amino acids to the diet reduced the protein levels of growing and finishing pigs from 21% to 14%, from 19% to 13%, resulting in a 40% reduction in urinary nitrogen excretion (P< 0.01), the odorous substance in the excrement is also significantly reduced. Therefore, the use of synthetic amino acids in livestock and poultry diets can increase the nitrogen use efficiency of the diet and reduce the excretion of fecal and urine nitrogen, thereby saving feed protein and reducing nitrogen pollution.
3.3. Nutrition of the digestive tract
The nutrients that are not absorbed at the end of the ileum of the digestive tract become the growing base of bacteria that grow in the large intestine. The huge bacterial carrier not only consumes the nutrition of the animal, but also hides a large number of pathogens such as Escherichia coli, Salmonella and Clostridium, in addition, the unabsorbed nutrients eventually put a heavy burden on the environment through the feces excreted by the animals.
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