Selection and breeding of gilts
The gilts chose to focus on physical and non-genetic conditions; they had good health and no genetic disorders; they had high reproductive power and had good external reproductive organs, growth rate, and feed utilization. The selection period of 2 months of age selection: nest selection, is to choose to stay in the big nest of good individuals. Nesting is the selection of well-developed piglets from a number of pigs with high head counts, high feeding rates, and weaning and breeding litters under the same conditions in which both parents are good individuals; 4 months of age selection: mainly to eliminate those growth and development Poor or severely deficient individuals; 6-months-old choice: When the reserve pig reaches 6 months of age, the tissues and organs have already been quite developed, the advantages and disadvantages are more prominent, and strict selection can be made according to various aspects of performance to eliminate adverse individuals; Pre-breeding selection: The reserve pigs were selected before the initial allocation and eliminated the reserve boars with unsatisfactory sexual organs, low sexual desire, low semen quality, and gilts with irregular estrus cycles and estrus symptoms. Grazing rearing is also carried out in stages. Adopt the "four-stage" rearing method, ie, 30-60 kg stage, fully feed and free-feeding; 60-90 kg stage, ensure stable body growth instead of rapid growth, restrict breeding, but restrict breeding must be accompanied by reserve mother The body condition of the pigs was combined; pre-breeding and pre-feeding were carried out one week before the breeding to increase the protein and energy levels of the diets; after mating, during pregnancy, the balanced and full-priced diets were provided and the animals were raised step by step. The nutritional needs of gilts are different from those of sows, and are also different from those of commercial pigs. Diets containing 15% crude protein and 0.7% amino acids are sufficient. Compared with diets for finishing pigs, gilts should have higher levels of calcium and phosphorus in their diets. The calcium and phosphorus levels that achieve optimal growth rates do not necessarily satisfy the need for optimal bone deposition. During the early growth and development stages of gilts, feeding a diet that meets the optimal calcium and phosphorus levels for bone deposition can extend reproductive life. The gilt diet contains at least 0.95% calcium and 0.80% phosphorus. The gilts are 5 months old after birth, and the weight is controlled at 70-80 kg; at the age of 6 months, it is controlled at 90-100 kg; at 7 months, it is controlled at 110-120 kg; at 8 months, it is controlled at 130-140 kg. 50pcs Kn95 Face Mask,Adult Non-Woven Fabrics Cover,Adult Non-Woven Face Mask,3D Dimensional Kn95 Face Mask Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com