Be wary of sows' seasonal infertility!
Wild boar estrus period is between November and January; pregnancy 114 days, that is, three weeks three weeks and three days, piglets will be born in March to May, when the spring is warm, all things are revived, which is beneficial to Piglets survive and grow. There is also enough food to support the sow's lactation. From May to October, it is a tedious period. This seasonal tediousness prevents the piglets from being born during the cold winter months. This is the evolutionary instinct of the animals themselves.
Modern breed pigs can estrus, breed, and breed through domestication, environmental changes, and artificial intervention, but they also have the nature of wild boars. With the raising of the breeding level, the degree of intensification is getting higher and higher, and production requirements are also increasing. With this increase, the term "seasonal infertility" has also become known to the culture community.
The decline in the estrus rate and the mating rate of the sow population in a certain season reduces the overall reproduction rate to “seasonal infertilityâ€. In August, September and October of each year, the negative effects of seasonal infertility of sows become particularly significant, as they are only manifested in late summer and autumn, so this “seasonal infertility†More often known as "Fall Infertility."
At this time, the number of sows in the esteem period is increasing, the conception rate is reduced, the rate of delivery is reduced, the miscarriage rate is increased, and the number of sows that are pregnant but not giving birth increases, that is, the number of sows’ “pseudo-pregnancy†increases until October. After the fertility will return to normal levels, the performance of the obvious seasonal, and the pig in the wild state is very similar, has a great impact on the pig's production; the situation of the various pig farms because of the pig species, different regions And there are different results.
Symptoms vary with sow's age, gilts have a delayed puberty, estrus does not reach the age, or the rate of mating is low after estrus and the return rate increases; sows are weaned to estrus Prolonged, decreased delivery rate, short estrus period, increased number of infertile pigs, increased recombination rate, increased abortion, increased mummy and stillbirth.
To improve the production level of the farm every year, we must find a solution; of course, the sows on the farm are now producing all year round, and they have lost their ability to adjust their reproduction as a function of the season. Some genetic strains are seasonal. It is quite sensitive. Seasonal infertility can be reduced by careful screening of breeding pigs without seasonal infertility; it is also possible to adjust production schedules to avoid “seasonal infertility†months and reduce the impact on sows.
Improve sow feeding management
During the whole lactation period, from the perspective of feeding materials, the seasonal effects were reduced, including the use of wet mixes, feeding at night, and raising amino acid concentrations to improve feed nutrition. Add Chinese herbal medicines such as Radix Astragali and Codonopsis pilosula to the feed to increase the estrus and litter size of sows.
Some farms add soda, vitamin C, gypsum and other medicines to the sow's feed because of summer heat, or add traditional Chinese medicines such as Folium and buffalo horns to the sow feed. These are mostly cold medicines. , Long time feeding, resulting in sow body cold, causing sows infertility.
Ensure that sows are comfortable in the environment, have enough exercise, reduce the use of positioning bars, and use ring feeding to ensure that the sow is physically and mentally comfortable, which is conducive to maintaining a high yield.
Boar semen quality also has seasonal changes
In the autumn and winter months, boars have the largest amount of semen. The frequency of sperm retrieval is 4 days, which can minimize the rate of sperm deformity. After semen collection and before use, it is necessary to check the quality of semen.
Treatment measures
In response to “seasonal infertilityâ€, injection of PG-600 will have a certain effect, and cloprostenol, pregnant horse serum, and human chorionic gonadotropin may also be used in combination. PG-600 was injected into the gilts or estrus-inducing gilts after 10 weaning to promote their estrus. The above methods all achieved good results, but also showed different effects due to different pig farms.
Accurate and accurate production records are then used to analyze and predict reproductive performance. Feeders use records as a tool to optimize production. At the same time, strict elimination of the problematic sows reduces or avoids “seasonal infertilityâ€.
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