Sows have a specific physiological phenomenon that is very sensitive to external stimuli, especially during estrus. But the time is not long, the general young sow is 3 to 5 days, the production of sows 2 to 4 days. If you do not master the heat, or miss the best breeding time, it is not only difficult to breed, even if it is accompanied by a few litter size.
Production practices have proven that the following are the key links in sow breeding.
1. Reproductive physiology of sows Generally local sows are about 3 months old, and foreign and hybrid sows have estrus performance from 4 to 5 months of age. However, mating is not suitable at this time, because early mating will affect the growth and development of sows, resulting in hindered maternal growth, fewer litter size and lower survival rate of piglets.
Under normal feeding and management conditions, the initial age of local sows is generally 6 to 8 months old and the body weight is 35 to 50 kilograms. When foreign sows and hybrid sows are 8 to 10 months old and have a body weight of 70 to 90 kilograms, it is most suitable for the first time.
In order to enable the sows to be mated on time, feeding and management should be strengthened and green and juicy feeds should be fed. This type of feed is physiologically alkaline, rich in vitamins, and can promote the development of female reproductive organs. Mating sows should have more than moderate levels of nutrition, so that it is not fat or thin. If the diet contains insufficient nutrients, too many carbohydrates, and insufficient supply of green and juicy feed, it will inevitably cause sows to become over-eating, resulting in reduced ovulation, increased births of weaker babies and stillbirths, lower birth weight, longer delivery time, and even dystocia. Terrible consequences such as teratility and freak.
2. Characteristics of breeding estrus in sows The pig is a multi-fetal animal, and usually ovulates 30 to 40 pieces each time. However, due to the different health conditions of individuals, it is impossible for all eggs to develop normally, and due to various factors such as improper breeding, there are few sows that can produce a few feet of eggs.
In order to increase the number of litters of sows as much as possible, it is important to do the following when breeding: One is to have a good grasp of the estrus period. The sow's estrus performance is particularly evident, and the mood begins to appear mental anxiety, food loss, arches, jumping bars, barking and purulent redness and other symptoms. You should look for estrus time and perform breeding in time. The second is to grasp the peak period of ovulation. Usually the local sow is the peak of ovulation from the evening of the second day of the estrus to the morning of the third day, and the fertility rate and the number of farrowings are higher when the ovulation peaks. Third, timely breeding. It is more appropriate for foreign breeds and hybrid sows to be bred from the day they start estrus to the second day. As pigs are of different ages, they should follow the principle of "early match, late match, and not get old". It is not easy to accurately grasp the ovulation peak of sows in production practice. In order to increase the chance of conception of sows, two breeding methods can be used, ie, sows are bred at 24 hours and 36 hours after estrus. The fourth is artificial aphrodisiac. For individual sows with abnormal estrus, acupuncture can be performed by massaging the breasts, driving away their movements, or taking medications, so that they can be ovulated in time for effective oviposition.
3, the mating method of the mating species In general, the mating of sows need to do a good job of artificial assistance. Because of the difference in body and weight of the male and female pigs, if they are not mated for a long time, the penis and the glans of the boar will be easily damaged, causing physical decline, affecting ejaculation and causing sperm efflux.
For males and females that have a wide range of body types (body weight) and difficulties in breeding, the following methods can be used: The first is the use of a mating stool. Use a 3 to 5 cm thick board to nail two activity stools. When the boar climbs onto the sow's back, the stool is immediately placed under the forefoot of the boar to relieve the sow's weight and support. The second is the use of spacer mating racks. Use a partition to hold the sow and do not allow it to swing back and forth. The third is to use simple mating columns. Use four wood posts as pillars and drill equidistant round holes 3-4 pairs along the middle of the wood column. Hold the sows in them and fix them properly in the trailing holes so that the male and female pigs can be mated smoothly.
4. Pregnancy management of pregnant sows Once the sow is pregnant, feeding and management should be strengthened. Attention should be paid to miscarriage. Under normal circumstances, the initial 15 to 20 days of egg implantation is very unstable, and it is easy to cause miscarriage. Special attention should be paid to protection, emphasizing the quality of feed and supplying protein, vitamins, and mineral-rich feeds. In the late gestation period of sows, due to the rapid growth and development of the fetus, the quality of the feed should be increased and the quantity increased. 2 to 3 days before the onset of labor, in order to prevent postpartum mastitis in sows, feed intake should be appropriately reduced.
Production practices have proven that the following are the key links in sow breeding.
1. Reproductive physiology of sows Generally local sows are about 3 months old, and foreign and hybrid sows have estrus performance from 4 to 5 months of age. However, mating is not suitable at this time, because early mating will affect the growth and development of sows, resulting in hindered maternal growth, fewer litter size and lower survival rate of piglets.
Under normal feeding and management conditions, the initial age of local sows is generally 6 to 8 months old and the body weight is 35 to 50 kilograms. When foreign sows and hybrid sows are 8 to 10 months old and have a body weight of 70 to 90 kilograms, it is most suitable for the first time.
In order to enable the sows to be mated on time, feeding and management should be strengthened and green and juicy feeds should be fed. This type of feed is physiologically alkaline, rich in vitamins, and can promote the development of female reproductive organs. Mating sows should have more than moderate levels of nutrition, so that it is not fat or thin. If the diet contains insufficient nutrients, too many carbohydrates, and insufficient supply of green and juicy feed, it will inevitably cause sows to become over-eating, resulting in reduced ovulation, increased births of weaker babies and stillbirths, lower birth weight, longer delivery time, and even dystocia. Terrible consequences such as teratility and freak.
2. Characteristics of breeding estrus in sows The pig is a multi-fetal animal, and usually ovulates 30 to 40 pieces each time. However, due to the different health conditions of individuals, it is impossible for all eggs to develop normally, and due to various factors such as improper breeding, there are few sows that can produce a few feet of eggs.
In order to increase the number of litters of sows as much as possible, it is important to do the following when breeding: One is to have a good grasp of the estrus period. The sow's estrus performance is particularly evident, and the mood begins to appear mental anxiety, food loss, arches, jumping bars, barking and purulent redness and other symptoms. You should look for estrus time and perform breeding in time. The second is to grasp the peak period of ovulation. Usually the local sow is the peak of ovulation from the evening of the second day of the estrus to the morning of the third day, and the fertility rate and the number of farrowings are higher when the ovulation peaks. Third, timely breeding. It is more appropriate for foreign breeds and hybrid sows to be bred from the day they start estrus to the second day. As pigs are of different ages, they should follow the principle of "early match, late match, and not get old". It is not easy to accurately grasp the ovulation peak of sows in production practice. In order to increase the chance of conception of sows, two breeding methods can be used, ie, sows are bred at 24 hours and 36 hours after estrus. The fourth is artificial aphrodisiac. For individual sows with abnormal estrus, acupuncture can be performed by massaging the breasts, driving away their movements, or taking medications, so that they can be ovulated in time for effective oviposition.
3, the mating method of the mating species In general, the mating of sows need to do a good job of artificial assistance. Because of the difference in body and weight of the male and female pigs, if they are not mated for a long time, the penis and the glans of the boar will be easily damaged, causing physical decline, affecting ejaculation and causing sperm efflux.
For males and females that have a wide range of body types (body weight) and difficulties in breeding, the following methods can be used: The first is the use of a mating stool. Use a 3 to 5 cm thick board to nail two activity stools. When the boar climbs onto the sow's back, the stool is immediately placed under the forefoot of the boar to relieve the sow's weight and support. The second is the use of spacer mating racks. Use a partition to hold the sow and do not allow it to swing back and forth. The third is to use simple mating columns. Use four wood posts as pillars and drill equidistant round holes 3-4 pairs along the middle of the wood column. Hold the sows in them and fix them properly in the trailing holes so that the male and female pigs can be mated smoothly.
4. Pregnancy management of pregnant sows Once the sow is pregnant, feeding and management should be strengthened. Attention should be paid to miscarriage. Under normal circumstances, the initial 15 to 20 days of egg implantation is very unstable, and it is easy to cause miscarriage. Special attention should be paid to protection, emphasizing the quality of feed and supplying protein, vitamins, and mineral-rich feeds. In the late gestation period of sows, due to the rapid growth and development of the fetus, the quality of the feed should be increased and the quantity increased. 2 to 3 days before the onset of labor, in order to prevent postpartum mastitis in sows, feed intake should be appropriately reduced.
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