1. Influence of variety According to data, the average number of ovulation in Chinese pig breeds was 17.21 at the beginning of production and 21.58 at production. For example, there were 25.68 Chinese Jiaxing black pigs, 28.0 Erhualian and 15 Neijiang pigs. . The number of pigs born in foreign pigs was 13.5, and 21.4 pigs were produced. For example, the average White pigs were 16.7, Duroc 11.5, and Landrace 15.22. The number of ovulation was different.
2, hybridization can increase the number of ovulation can increase the number of sows ovulation, has been verified by many tests, is a relatively easy to implement method. In the organization of production, most of the local breed sows that have a higher number of litters are female parents, and the male pigs that have introduced pig breeds are male parents. After selection, the sow hybrid females continue to be female parents, and then introduce one more import pig. The male boar is the second male parent, and all the offspring are fattened. As a result of this, full use of the heterozygous generation has the characteristics of better ovulation, which can increase production efficiency. The “Sanyo†hybrid implemented in the market is to use this feature to formulate a production model.
3. The number of ovulations of different parity sows differs from that of primiparous and sows. The number of ovulations also changes with the increase of parity in the sows. Generally speaking, the number of litters will gradually increase during the period of 2-6 months, and after 6 months, especially after 8 months, The number of ovulation shows a decreasing trend. This law of change provides a basis for us to reasonably adjust the parity of sows. That is, the age of the sow group should not be too small or too large, and it should be ensured that the proportion of sows with a majority of 3-5 births is a good proportion.
4. The number of ovulations in pigs is affected by temperature. According to Mr. Xu Shiqing's measurement, the number of ovulation in Jiaxing black pigs is 6.5 °C in winter, and the number of ovulation is 23.3, while the ovulation number is 34.4 in summer temperature at 21-24 °C. That is, a suitable high temperature can promote multiple ovulation of sows. However, too high a temperature can affect the ability of the sow to ovulate normally. In the production, it is necessary to adjust the temperature in the house with the change of climate. It is important to promote the normal estrus of sows and ovulation.
5, Nutritional supply data on sows ovulation data reported that the level of nutrition has little effect on the number of ovulation in pigs. Such as high nutrient levels, the number of ovulation was 13.9 and the low nutrient level was 13.6. However, there are also reports that when gilts are in heat, short-term superior feeding can increase the number of ovulation by 1-2 pieces, which has a certain use value in production.
6, the application of sex hormones can affect the number of ovulation Practice shows that sows after sexual maturity, or after weaning appropriate selection of female hormones, such as pregnant horse serum, estradiol, etc., can adjust the endocrine changes in sows, promote sows Timely heat, and the possibility of abnormal ovulation, makes it possible to increase the number of sows born.
7, gilts aphrodisiac supplementation can increase the number of ovulation gilts appear estrus signs began to increase the daily dietary supply, increase the amount of 40-50% of the original amount, you can make sows increase the number of ovulation more than 2 . This method does not apply to adult sows.
8. The number of ovulation of sows after weaning to short-term pre-breeding (feeding) can be increased by one.
2, hybridization can increase the number of ovulation can increase the number of sows ovulation, has been verified by many tests, is a relatively easy to implement method. In the organization of production, most of the local breed sows that have a higher number of litters are female parents, and the male pigs that have introduced pig breeds are male parents. After selection, the sow hybrid females continue to be female parents, and then introduce one more import pig. The male boar is the second male parent, and all the offspring are fattened. As a result of this, full use of the heterozygous generation has the characteristics of better ovulation, which can increase production efficiency. The “Sanyo†hybrid implemented in the market is to use this feature to formulate a production model.
3. The number of ovulations of different parity sows differs from that of primiparous and sows. The number of ovulations also changes with the increase of parity in the sows. Generally speaking, the number of litters will gradually increase during the period of 2-6 months, and after 6 months, especially after 8 months, The number of ovulation shows a decreasing trend. This law of change provides a basis for us to reasonably adjust the parity of sows. That is, the age of the sow group should not be too small or too large, and it should be ensured that the proportion of sows with a majority of 3-5 births is a good proportion.
4. The number of ovulations in pigs is affected by temperature. According to Mr. Xu Shiqing's measurement, the number of ovulation in Jiaxing black pigs is 6.5 °C in winter, and the number of ovulation is 23.3, while the ovulation number is 34.4 in summer temperature at 21-24 °C. That is, a suitable high temperature can promote multiple ovulation of sows. However, too high a temperature can affect the ability of the sow to ovulate normally. In the production, it is necessary to adjust the temperature in the house with the change of climate. It is important to promote the normal estrus of sows and ovulation.
5, Nutritional supply data on sows ovulation data reported that the level of nutrition has little effect on the number of ovulation in pigs. Such as high nutrient levels, the number of ovulation was 13.9 and the low nutrient level was 13.6. However, there are also reports that when gilts are in heat, short-term superior feeding can increase the number of ovulation by 1-2 pieces, which has a certain use value in production.
6, the application of sex hormones can affect the number of ovulation Practice shows that sows after sexual maturity, or after weaning appropriate selection of female hormones, such as pregnant horse serum, estradiol, etc., can adjust the endocrine changes in sows, promote sows Timely heat, and the possibility of abnormal ovulation, makes it possible to increase the number of sows born.
7, gilts aphrodisiac supplementation can increase the number of ovulation gilts appear estrus signs began to increase the daily dietary supply, increase the amount of 40-50% of the original amount, you can make sows increase the number of ovulation more than 2 . This method does not apply to adult sows.
8. The number of ovulation of sows after weaning to short-term pre-breeding (feeding) can be increased by one.
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