Cause Analysis
Normally the sows will heat soon after weaning, and the average time for the occurrence of estrus is 7 days after weaning, the earliest is 2 days, and the latest is 17 days. The fact that sows postpone or postpone estrus, also known as lack of estrus after weaning, means that sows do not have natural estrus within 20 days after weaning of the piglets, and no signs of estrus or long-term sows have been present for more than 30 days. Then again the phenomenon of estrus. There are many reasons why sows postpone estrus or estrus after weaning. The main factors are:
Young sows have a premature age. The young sows that have just entered the puberty period, although their genitals already have normal reproductive functions, do not mean that they can formally engage in abortions at this time, because juvenile sows will be fertilized when they are prematurely mated, which will not only result in fewer litters, but also piglets. Birth weight, weaning weight and survival rate are low, but also affect the sow's own weight gain. When they are adult, their weight is significantly lower than the same species of the same age sow (usually a difference of 25 kg -40 kg). In sows with a small body weight, the estrus after weaning is significantly delayed, and some are no longer estrus.
The sow was weaned late. Under normal circumstances should be 25 days -28 days weaning, some weaning is too late, sows lost too much weight at weaning, sows experienced a lactation, weight will have varying degrees of decline, the general weight loss ratio is about 25% Around, this does not affect the normal estrus breeding of the sow after weaning. However, if dietary nutrients are lacking, the amount of lactation is large, and there are too many babies, the sows will be abnormally thin when weaning, and the weight loss will be larger. If the weight exceeds 60 kg, the estrus breeding after sow weaning should be significantly delayed.
Temperature and season effects. Sows are multi-cycle estrus livestock and can be escorted for many years. However, in the hot summer season (June-September), 7 days after weaning, the sow’s estrus rate is 20% lower than other seasons, especially for the primiparous sows, which is 25% lower than that of the sows. . Lean meat breeds and their sow hybrids are more sensitive to high temperatures. Summer temperatures above 29.4 °C will interfere with sow estrus behaviour and reduce feed intake and ovulation; in the summer when temperatures above 32 °C are high, large Most sows stop estrus.
Sows are too fat. Some sows have low lactation and low number of piglets during the lactation period. Some sows are fed with high-protein and high-energy diets. They are fed for a long period of time and are not reduced in weight until the time of weaning. The bodies deposit a lot of fat and cause the body to become overweight. Caused the sow follicular development to stop and can not be normal natural estrus breeding.
Improper feeding and management. Some pig farms do not use sow-specific feeds, but use growing pigs to feed their sows so that the sow's reproductive system is not properly supplemented with nutrients and even lacks vitamins and trace elements, which may hinder the development of reproductive systems in sows. . Although feeding costs may be lower, a longer feeding period may cause great harm.
Endocrine abnormalities. The sows' birth canal injury, contamination, or fetal births, or residual placenta, or residual placenta and septa, oligohydramnios in uterine laxity, unsanitary surgery, incomplete disinfection during artificial insemination, and inflammatory secretions in reproductive organs or semen of boars during mating The sow or sow suffers from inflammation of the sow's reproductive system caused by brucellosis or other microbial infections. These diseases can cause the sow to be delayed or not estrus.
The treatment method correctly grasps the initial fitting period of the young sow. Practice has proved that domestic cultivars and their hybrid young sows do not start earlier
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