To improve the efficiency of sow breeding, sow sows more prolific, production Zhuangzi, reduce the cost of weaned piglets, promote the healthy growth of the mother, which is the most effective scientific management techniques.
First, adjust the structure of gestational age In general, 3-6 fetal sows reproductive performance in the best period, in order to ensure the sow's group fecundity, the gestational stage sows should be maintained at about 60%, first child, 2 fetal sows are 30%-35% and 7 or more are 5%-10%.
Second, the selection of gilts gilts selected stay 1 month before mating, the method is to combine the family reproductive performance, choose to stay well developed, many teats and no abnormalities, nipples and large and normal vagina, while requiring hind legs open, most Fortunately, the septum between the two rows of nipples is larger, and the sows with three pairs of teats in front of the umbilicus are reserved. After selection, the rearing is appropriately restricted, sows are not over-fat or over-slim (up to grade 2.5-3 of the US 5-grade scale, vertebrae and ribs are not visible, but the vertebrae can not be touched, and the ribs cannot be touched). Feeding began in 2 weeks and reached 2.0-2.5 kg. Feed nutrient level reached about 16% of crude protein, minerals, vitamins, adequate requirements.
Third, select the right time to weaning In order to prevent the occurrence of mastitis, sows 3 days before weaning should be gradually reduced to 2 kg. However, in order to promote the estrus of the sow and increase the number of ovulation after weaning, high-quality feed (crude protein ≥16%, metabolic energy ≥3.1 megacal/kg, lysine ≥0.8%) should be used, and the amount of feed can be given to each Day 2.3 to 2.6 kg.
Fourth, do a good job during pregnancy, breeding sows are generally implemented two times, from the second day of second breeding to 3 weeks after mating, should provide low energy and low protein feed (generally crude protein ≤ 14%, metabolic energy 3.0-3.1 Megacalories/kg.) The daily feed volume is between 1.5 and 2.0 kg. Otherwise, it will affect the secretion of progesterone due to excessive feed intake, increase embryonic death and reduce litter size.
From the fourth week to the 80th day of pregnancy, the low-energy and low-protein feeds should be continued, but the daily feed amount should be 0.3-0.5 kg higher than the pre-pregnancy period, reaching 1.8-2.3 kg per day. This stage must ensure that the sows have proper lyricism. It is generally best to control to the United States five grades 2.5 to 3. If it is not easy to grasp, do “Ningshen not fat†because overfeeding during pregnancy will lead to anorexia during breastfeeding, no secretion (less secretion), or too much weight loss, affecting the fecundity of the second trimester.
Fifth, the management of late pregnancy from 80 days of pregnancy to the litter size, in order to ensure the rapid growth of the fetus, to increase the birth weight and health of piglets, sows at this stage should be fed high-energy high-protein feed, daily feed generally 2.3 to 2.8 kg . Sows were repelled in vitro and in vivo during the first 2 weeks of prenatal treatment and were sterilized by the body surface in the prenatal week and transferred to the farrowing house (bed).
Sixth, breast-feeding during lactation should be fed high-energy high protein feed, generally more than 16% crude protein, digestive energy greater than 3.1 megacalories/kg. The first 3 days after farrowing, the amount of feed was 1.8-2.3 kg, and 0.5 kg was added daily from the 4th day until free intake.
Seven, pay attention to other factors
1. Timely mating through pheromone, nasal contact with the nose of the pig barrier, pressure reflex test and observation of estrus symptoms of other sows, estrus identification should be performed twice a day, sows receiving boars will be considered as estrus. In general, estrus is used twice for breeding. For sows that find estrus in the morning, they are bred for the first time in the afternoon and the second time in the morning on the second day. For gilts that find estrus in the afternoon, they are bred for the first time on the morning of the second day and the first in the afternoon. Secondary breeding.
2. The use of hormones to regulate the use of reproductive hormones in sows can, in some cases, lead to better results. However, the use of hormones must be based on feeding and management to maintain the normal, medium and thin body condition of sows, and to prevent disease infections. On this basis, sows that are still unable to mate with normal estrus can be adjusted with hormones.
First, adjust the structure of gestational age In general, 3-6 fetal sows reproductive performance in the best period, in order to ensure the sow's group fecundity, the gestational stage sows should be maintained at about 60%, first child, 2 fetal sows are 30%-35% and 7 or more are 5%-10%.
Second, the selection of gilts gilts selected stay 1 month before mating, the method is to combine the family reproductive performance, choose to stay well developed, many teats and no abnormalities, nipples and large and normal vagina, while requiring hind legs open, most Fortunately, the septum between the two rows of nipples is larger, and the sows with three pairs of teats in front of the umbilicus are reserved. After selection, the rearing is appropriately restricted, sows are not over-fat or over-slim (up to grade 2.5-3 of the US 5-grade scale, vertebrae and ribs are not visible, but the vertebrae can not be touched, and the ribs cannot be touched). Feeding began in 2 weeks and reached 2.0-2.5 kg. Feed nutrient level reached about 16% of crude protein, minerals, vitamins, adequate requirements.
Third, select the right time to weaning In order to prevent the occurrence of mastitis, sows 3 days before weaning should be gradually reduced to 2 kg. However, in order to promote the estrus of the sow and increase the number of ovulation after weaning, high-quality feed (crude protein ≥16%, metabolic energy ≥3.1 megacal/kg, lysine ≥0.8%) should be used, and the amount of feed can be given to each Day 2.3 to 2.6 kg.
Fourth, do a good job during pregnancy, breeding sows are generally implemented two times, from the second day of second breeding to 3 weeks after mating, should provide low energy and low protein feed (generally crude protein ≤ 14%, metabolic energy 3.0-3.1 Megacalories/kg.) The daily feed volume is between 1.5 and 2.0 kg. Otherwise, it will affect the secretion of progesterone due to excessive feed intake, increase embryonic death and reduce litter size.
From the fourth week to the 80th day of pregnancy, the low-energy and low-protein feeds should be continued, but the daily feed amount should be 0.3-0.5 kg higher than the pre-pregnancy period, reaching 1.8-2.3 kg per day. This stage must ensure that the sows have proper lyricism. It is generally best to control to the United States five grades 2.5 to 3. If it is not easy to grasp, do “Ningshen not fat†because overfeeding during pregnancy will lead to anorexia during breastfeeding, no secretion (less secretion), or too much weight loss, affecting the fecundity of the second trimester.
Fifth, the management of late pregnancy from 80 days of pregnancy to the litter size, in order to ensure the rapid growth of the fetus, to increase the birth weight and health of piglets, sows at this stage should be fed high-energy high-protein feed, daily feed generally 2.3 to 2.8 kg . Sows were repelled in vitro and in vivo during the first 2 weeks of prenatal treatment and were sterilized by the body surface in the prenatal week and transferred to the farrowing house (bed).
Sixth, breast-feeding during lactation should be fed high-energy high protein feed, generally more than 16% crude protein, digestive energy greater than 3.1 megacalories/kg. The first 3 days after farrowing, the amount of feed was 1.8-2.3 kg, and 0.5 kg was added daily from the 4th day until free intake.
Seven, pay attention to other factors
1. Timely mating through pheromone, nasal contact with the nose of the pig barrier, pressure reflex test and observation of estrus symptoms of other sows, estrus identification should be performed twice a day, sows receiving boars will be considered as estrus. In general, estrus is used twice for breeding. For sows that find estrus in the morning, they are bred for the first time in the afternoon and the second time in the morning on the second day. For gilts that find estrus in the afternoon, they are bred for the first time on the morning of the second day and the first in the afternoon. Secondary breeding.
2. The use of hormones to regulate the use of reproductive hormones in sows can, in some cases, lead to better results. However, the use of hormones must be based on feeding and management to maintain the normal, medium and thin body condition of sows, and to prevent disease infections. On this basis, sows that are still unable to mate with normal estrus can be adjusted with hormones.
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