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How does the weaning age affect the reproductive performance of the sow herd?

hit count: Updated: 19/11/25 09:22:11 Source: woiego.com [ close ] share:

    Weaning age of affect reproductive performance groups mainly in the following areas, please wherever he goes after reading in conjunction with their actual situation than to look replies, thanks again hope the owner can give this post to join the essence of posts.

    1. Uterine rejuvenation: During lactation, the sow does not estrus. This is because (1) the will inhibit sow ovulation and the secretion of pituitary hormones. (2) breastfeeding will stimulate the prolactin secretion. After weaning or lactation is reduced, the levels of prolactin in the sow's blood gradually decrease, while the levels of luteinizing hormone and estradiol increase, which stimulates the sow's estrus. Suppression of estrus during lactation provides the sow with a period of time to recover the uterus. In order to restore the ideal reproductive effect to sows, it is necessary to restore the sow's work.

    2. Segment and even estrus days: Research shows that the older the weaning age, the shorter the estrus and even estrus days. If the lactation period is shorter than 10 days, the period and even the estrus interval will be greatly extended. Sows between 3-4 weeks of lactation have the shortest estrus interval. The percentage of estrus in sows more than 20 days after lactation 7 days after weaning was higher than that in sows 14-15 days. Compared with pre-experimental sows, primiparous sows are more likely to experience a weaning-to-estrus interval if the lactation period is shorter than 21 days. This phenomenon is related to intake during the lactation period, and the lactation will be advanced to within 17 days, especially for young sows. The best balance can be obtained between the weaning to estrus interval and production throughput.

    There is a negative correlation between the weaning to estrus interval and the duration of the estrus period. Therefore, sows with short lactation periods also have shorter estrus periods. such. Breeding plans should also be adjusted based on changes in age.

    However, by a simple multiple breeding method, two fertilizations are performed at 24 hour intervals, so that the reproductive performance of the sow can be firmly guaranteed.

    For sows, if the daily feeding during lactation can be guaranteed

    Above 5.7 kg, the weaning to estrus interval can be controlled within an acceptable range even if weaned between 10-19 days of age. The lactation period must maximize the sow's daily feed intake. If not, you can adjust your own feed formula to use high protein and high energy feed) in order to maintain the sow's body condition. (I believe everyone knows this better than me, and achieving high feed intake during lactation is both important and difficult.)

    3. Ovulation rate, conception rate, embryo survival rate, and delivery rate: Most studies have shown that the ovulation rate in the next estrus has nothing to do with the number of lactation days. However, the conception rate usually decreases with shorter lactation. Studies have shown that as the lactation period shortens, embryo survival is declining. The reason why sow embryos weaned before 21 days will decline is because of incomplete endometrial recovery. The delivery rate also decreases with decreasing weaning age. Compared to sows who were weaned at 23-25 days of age, sows were significantly lower at 11-19 days. The degree of decline in fertility and delivery rates observed on different varies depending on other management factors.

    4. Number of litters in the next litter: The effects of different lactation days on the number of litters in the litter of weaned sows are quite different from the results observed in various studies.

    In general, weaning sows below 18 days of age usually have a lower litter count. The influencing factors are (1) uterine restoration time, (2) ovulation rate, (3) fertilization rate, and (4) embryo survival rate.

    5. Weaning weight: The weight of the weaning litter in the next litter of a sow with a long lactation period is obviously higher than that of a sow with a short lactation period. Among sows weaned at 15 (43.5), 18 (46.7), 21 (50.8), and 24 (55.8) days, the average litter weight increased significantly with increasing weaning age.

    6. Productive life and body condition of sows: shortening the lactation period increases the number of litters per pig per year, and accordingly increases the metabolic requirements of the sow body. This seems to have led to an increase in sow elimination rates, as sows with shorter lactation periods had an average parity than sows with longer lactation periods. (That is to say, short lactation is also good for sows, with less weight loss)

    7. Varieties: The sow-to-estrus interval and the length of the lactation period are basically the same for each breed of sow. However, some breeds are sensitive to changes in weaning age and some are not. Therefore, producers should evaluate their own herd.

    8. Number of piglets weaned per sow per year: The factors affecting the number of piglets weaned per sow per year include live births, pre-weaning mortality, and number of litters per sow per year. Although shortening the lactation period will result in a reduction in the number of live births, it will increase the survival rate before weaning and increase the number of litters per sow per year. The reason why early weaning piglets have low pre-weaning mortality is that the accident may be due to a shorter exposure to infection risk. The pigchamp data show that as weaning days are shortened from 25 to 13 days, the number of weaned piglets per weaned sow per year increases. However, the data varies greatly from farm to farm, regardless of age. Due to various factors such as management level, production environment, nutrition, and genetics, the production performance of the farm will be affected. Even if weaned at the same age, different farms will get different results.

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