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. The birth weight, weaning weight, and survival rate are low, but also affect the sow's own weight gain. When they are adult, their body weight is significantly lower than that of the same breed of sows (usually a difference of 25 kg to 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. The pig e net users recommended normal conditions should be 25 days to 28 days weaning, some pigs weaned too late, weaning weight loss when the sow is too much, the sow experienced a lactation, weight will have varying degrees of decline, the general weightless The proportion is about 25%, which does not affect the normal estrus breeding of sows 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.
Treatment method
Correctly grasp the appropriate timing of the initial allocation of young sows. It has been proved that domestic breeding breeds and their hybrid young sows have an early fitting period of no earlier than 8 months and a weight of no less than 100 kg. Experienced pig farms have passed three estrus periods. Generally, one estrus cycle is from 18 days to 21 days. Therefore, about 2 months after the initial stage of the estrus, the young gilts were put into breeding after the 4th estrus. .
Oleica was added to the whole lactation feed 20 days before delivery. That is, the sow should allow her to have a maximum body condition reserve during lactation, so that the weight loss during sow weaning will not be excessive. Short-feeding nursing sows with poor body condition adopt consistently enhanced feeding methods, that is, the sow feeds 4 kg to 5 kg per day (feeds 8 piglets), and feeds 5 kg to 6 kg per day (10 The first ~ 12 piglets), choose high-quality nursing sow feed, feeding 3 to 4 times a day.
Grasp the weaning time and cool down during the summer. The weaning time should be controlled within 28 days. When the temperature rises above 33°C, spray water can be used to reduce the temperature and take certain ventilation measures. A special drip cooling device can be designed for lactating sows. After weaning, 1 kg of Yabo + 200g of Zhongwei Lengxing Starch and 500 g/kg of Li Huning can be added to the feed, which can be continuously fed for 7 days to 10 days. Promote normal estrus in sows
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