In the past decade, the United States has undergone tremendous changes in sow breeding, weaning pig management and feeding technology. At present, the following practices are prevalent in the US pig industry. 1. Individual weaning means that the heavier piglets in the nest are weaned 2 to 3 days in advance, so that the piglets with smaller body weight have the opportunity to eat more breast milk, thus achieving a larger weaning weight. According to the study, piglets weighing more than 6.5 kg at weaning can reach market weight 7 days earlier than those with weaning weight less than 5 kg. 2. The one-on-one feeding method transfers the weaned piglet directly from the sow house to the finishing house and raises it to reach the market weight. This reduces the traditional link from the sow house to the nursery house and avoids some of the stress reactions that result from this. The main advantages of this method are faster weight gain and lower labor and transportation costs. The disadvantage is that the utilization rate of the pig house is low and it is not possible to do three batches of pigs per house per year as usual. One-for-one feeding methods also require better insulation performance in the finishing house, and the breeder has a higher level of technology. 3. Sows' feeding practices Sows consume large amounts of nutrients in the body during pregnancy and lactation, mainly fats, proteins and minerals. In the first few weeks of lactation, the sow's backfat can be reduced by 30%. In order for the sow to return to estrus, the nutrient reserve must be quickly rebuilt. The sow stage feeding method includes at least 4 types of feed: post-lactation material, pre-match material, post-match material, and post-pregnancy material. Increasing the intake of 1.256 MJ/day of energy feed after weaning increases the number of litters by about one. The added energy must be in the form of starch. Glucose produced from starch stimulates ovulation. Organic trace elements are also conducive to recovery of trace element reserves in sows. 4. Cooperative sow farms This practice consists of a sow farm with 1200 to 1,600 sows on several growing farms. Generally there are 8 shareholders in each sow farm, depending on the piglet's stay in the nursery. Each shareholder will receive all weaned piglets produced by the sow farm within a week. When these pigs leave the nursery, the growing farm receives another batch of all piglets produced in one week from the sow farm. The cooperative sow farm is an important part of the all-in, all-out growing pig farm. And all-in and all-out type is replacing more and more pig farms in an uninterrupted manner. This approach is conducive to improving the management efficiency and implementing more thorough cleaning and disinfection between the two batches of pigs. 5. Weaned Piglet Isolation and Feeding Weaning is carried out at 1 to 2 weeks of age, and the weaned piglets are kept in nursery pigs far from the sow farm in order to reduce the vertical transmission of certain diseases from the sow to the piglet. Isolation and feeding increases the number of litters per sow per year per year per litter, but may reduce the number of litters and litter size in the next litter. 6. Increased market weight The listed weight has increased from 100 kg to 114 kg. Slaughterhouses are willing to weigh more pigs in order to increase processing efficiency. Modern pig breeds can also achieve larger body weight without accumulating excess fat.
Diammonium Phosphate,Npk Compound Fertilizer,Phosphatic Fertilizer
Xuzhou First Chemical Co., Ltd , http://www.chfertilizer.com