Pig farming is to make money. To maximize production efficiency, we now introduce foreign varieties and adopt factory production management methods. In order to allow pigs to grow more than a few nests, most people now advocate early weaning at the age of 21 days, and some have even proposed 16-18 days of weaning. Are these practices and formulations really scientific? Can it really bring benefits? Let's analyze it:
First of all, let's look at the sow's egg development and ovulation period. The estrus cycle of sows is mostly 18-21 days. The estrus cycle of foreign breeds is on average 2-3 days longer than the local estrus. From estrus to ovulation is mostly 24-48 hours. So now we have to breed foreign varieties from the date of production counted as true estrus ovulation for 23 days, plus a few days before the production due to production-induced physiological disorders, ovarian production to resume production after 3 days. It can be seen that the postpartum sow must reach about 28 days of true ovulation.
Second, the sow is still at the peak of lactation at 18-21 days of age. At this time, the nutrition obtained by the piglet through breast milk is also the main source of its growth, and it is also an important development period of its various organs. At this time weaning stress and camping on piglets are relatively large and not the best time.
Based on the above two points, we can see that the aim of early weaning of piglets is to enable sows to successfully breed in the first post-natal period without affecting production, and secondly, to enable piglets to maximize their growth and health. The organs are best developed to cope with the growth after weaning.
In the actual production process, we sows weaned on the 21st for most of the 8-10 days after a week, and it is clear that the sows’ ovulation period is 28-30 days. In order to make full use of breast milk and sow production, weaning at the age of 26-28 days postpartum is the best time for sows. During this period, the peak lactation period of the sows has passed, and the ovary has just recovered and can return to heat, ovulation, and the uterine horn can return to normal to accept a new pregnancy. Most of the sows weaned at this time were estrus 3-4 days after weaning and the estrus rate of the sows during this time period was also high.
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