How do you solve the problem of a three-way cross sow not showing obvious estrus after weaning her first litter?
What should be done if a three-way cross sow does not show obvious estrus after weaning her first litter?
Answer
The main causes of mastitis are teat injury and infection in sows, poor milk flow in sows, and postpartum triad syndrome in sows.
Intravenous infusion can be usedtreatment: First bottle: lincomycin 30ml + Vc 20ml + oxytocin 2 vials + normal saline 500ml; second bottle: amoxicillin 6g + Houttuynia cordata 20ml + 5% glucose 500ml. Infuse continuously for 2 days. Note: when infusing a postpartum sow, try to squeeze out all the milk; swelling will only begin to subside about 24 hours after the infusion starts. At the same time, keep the environment clean and hygienic, wash and disinfect the udder with potassium permanganate water, massage the udder, and apply hot compresses, for 3 consecutive days.
Xingyu Farm: What are the breeding standards for two-way and three-way cross sows?
Answer
Pay attention to 2 points: do not restrict feed excessively before puberty, and breeding must meet the standards. The age at first mating of a sow is very critical. For two-way cross sows, the age at first mating is 220-230 days, body weight 130-140kg, and backfat thickness P2 value 14-16mm. For three-way cross sows, the age at first mating is greater than 240 days, body weight 140-150kg, and backfat thickness P2 value 13-15mm. Whether two-way or three-way, mate only at the 2nd or 3rd estrus.
Weilaixing: When is generally the best time to mate a sow in estrus?
Answer
Several factors need to be considered: ① external signs, including the degree of vulvar swelling and redness, mucus, frequent urination, and standing reflex; ② there are differences between first-parity sows and multiparous sows, return-to-estrus sows, and three-way cross sows.
Gilt: the estrus period is relatively long. You can choose to mate 8-12 hours after she begins estrus and shows the standing reflex, then mate again 12 hours later. If the standing reflex continues afterward, mate again 12 hours later; for sows in overdue estrus (over 8.5 months), mate as soon as they come into estrus.
Weaned sows: weaned at the normal time (within 28 days of age), coming into estrus in 3-5 days. You can mate for the first time within 8 hours after the standing reflex appears, and mate again 8-12 hours later; if estrus occurs after 5 days, mate after the standing reflex appears, and mate again 8-12 hours later;
If the nursing period exceeds 28 days, mate as soon as there is a standing reflex after weaning estrus, and mate again 8-12 hours later;
Return-to-estrus sows: if the uterus is normal, mate as soon as return to estrus is detected (3 times);
Three-way cross sows: mate when there are obvious signs of estrus (2-3 times; there is no need to wait for the standing reflex, to avoid missing it).
Lu Shengwen, Hechuan, Sichuan: In reproductive nutrition, is it better to feed fiber nutrition throughout or at fixed points?
Answer
For sows, fiber nutrition is equally important as the other major nutrients and has special significance for sows. It not only reduces constipation, but also increases intestinal volume, increases feed intake during lactation, increases satiety and reduces restlessness, reduces oxidative stress, promotes the development of reproductive organs, and improves piglet vitality. The key point is during the feed restriction period of sows. Adding it throughout is acceptable, but at some stages (such as lactation), if there is too much fiber, the concentration of other nutrients may be lower, so pay attention to the amount added. We recommend supplementing gestating sows with 350~400g of neutral detergent fiber (NDF) per day.
Reproductive nutrition can be added throughout.
Yang Lianqing: How can piglet uniformity be improved, and how can the number of piglets born be increased?
Answer
This is a very good question. To be honest, uniformity is more important than birth weight.
Several aspects need special attention: ① the sow's follicular development period, with attention before and after weaning. First, the sow's weight loss during the entire lactation period must not exceed 10kg; second, supplement and add reproductive nutrition. ② the fertilized egg development period, that is, the first month of pregnancy. First, after mating, feed reduction must not be applied uniformly across the board (those with severe weight loss after weaning do not need feed reduction, and after mating in summer there is no need for feed reduction; gilts may be considered for feed reduction). Second, it is still necessary to supplement and add reproductive nutrition. ③ control of the sow's body condition. From 40 to more than 70 days of pregnancy, the sow's body condition should be controlled at about 3 points of body condition plus or minus about 0.2; in the later stage, use gestating sow feed for late-pregnancy flushing; ④ a reasonable parity structure for sows; and proper mating operations.
Wu Dongli: How should gestating sows be fed to manage body condition, and is weight loss in lactating sows a normal phenomenon?
Answer
Body condition of gestating sows: about 2.5 points after mating, about 3 points in the middle stage, and about 3.5 points in the later stage. Body condition of sows is mainly managed through feeding and the addition of fiber, not only by increasing or decreasing the amount fed, but by making appropriate adjustments to nutrient concentration, so that the sow both eats enough and has moderate nutrition. It is like the principle of human weight loss: not eating nothing, but eating more foods with less energy and less protein, while still eating enough to feel full.
Weight loss during lactation is a normal phenomenon, but it should be controlled within a reasonable range (within 10kg).
Leshan, Sichuan (Li Ping): Dean Zhu, may I ask, for gilts from the gilt stage to the mating period, is it right not to restrict feeding, that is, let them eat freely?
Answer
Gilts are not to be fed without restriction; rather, feed should not be excessively restricted before puberty, and after the first estrus feed needs to be restricted. Mating is generally carried out at the 2nd or 3rd estrus, so after the first estrus, feed should be restricted, and the sow must not be allowed to become too fat. After the first estrus, restrict feed for 2 weeks; in the 3rd week, that is, one week before the second estrus, carry out flushing to promote ovulation.
Wuyoushui: How should the problem of a three-way cross sow not showing obvious estrus after weaning her first litter be handled?
Answer
For sows that do not show obvious estrus, measures to stimulate estrus can be adopted, such as exercise (driving them to move), lighting (16 hours of light and 8 hours of darkness for weaned sows, light intensity 200lx, maintained regularly every day), and intensified boar exposure, among other stimuli. Boar exposure is the most important measure to promote estrus; at the same time, during lactation and the pre-mating preparation period, pay attention to supplementing reproductive nutrition.
VIP Branch - Shandong - Wang Jinlong: Hello Dean Zhu! A multiparous sow is three days past the due date and has not farrowed. How should this be handled?
Answer
It is actually normal for sows to farrow from 114-118 days, but when a sow shows no signs of farrowing by 115 days of pregnancy, cloprostenol (half the recommended dose) can be injected intramuscularly into the inner side of the vulva to induce farrowing (20~24 hours after intramuscular injection of cloprostenol, inject 5IU of oxytocin).
Northeast Changtu 2258: Teacher, when is the best time for sows in gestation stalls to be moved onto the farrowing crate? How can stress be avoided?
Answer
3-5 days before the due date, move them onto the farrowing crate; farms with the conditions can spread burlap or straw on the farrowing crate to create for the sow the feeling of carrying grass to make a nest, and cultivate her maternal behavior. When I visited Germany, I saw that they had a special place on the sow farrowing crate for placing straw, in order to cultivate the sow's maternal behavior and stabilize the sow's emotions before farrowing.
Peng Shuiping, Zhentou, Hunan: Can soybean dregs be used to add fiber? If so, what proportion? Is it better fermented or can it be fed directly?
Answer
Yes, soybean dregs are a relatively good source of fiber;
The moisture content of soybean dregs varies, so the proportion varies; the specifics need to be judged by yourself;
Fermenting is better.
Song Weidong, Shanggao, Jiangxi: Is it good to give an intravenous drip during farrowing? If a drip is to be given, what medicines are good to use?
Answer
During the farrowing process, infusion can increase the sow's farrowing strength. It should be done promptly when the sow's spirits begin to decline, her breathing is relatively slow, and she is relatively weak: generally start the infusion after the sow has delivered 8 piglets; for old sows, infuse when 5-6 piglets have been delivered; for more sensitive first-parity sows, it can be done after 8 piglets have been delivered.
Bottle 1: normal saline 500ml + Zhongzheng Hunganqing 30ml + VC 20ml;
Bottle 2: 10% glucose 500ml + Jiamian 30ml + Shengliyuan 20ml.
Blue Flame: What is going on when a sow has no milk or little milk after farrowing?
Answer
Postpartum agalactia or hypogalactia may be caused by stress in the sow, postpartum inflammation, insufficient feed intake, and insufficient suckling stimulation by piglets, among other causes, and belongs to a syndrome. Failure to suckle all the colostrum is the main cause.
For sows showing milk let-down problems, on the one hand, large piglets can be used to suckle (if the suckling strength of the piglets is insufficient, use several large piglets to nurse, placed on the last few teats; because the teats at the back have relatively less milk, these piglets will push forward, and this can get all the teats sucked once and clear all the teats), or manually massage the udder and apply hot compresses with a 0.1% potassium permanganate hot towel, while clearing the milk ducts, anti-inflammatory, and infusiontreatment: First bottle: lincomycin (2 vials) + vitamin C (3 vials) + oxytocin (1 vial) + glucose sodium chloride 500ml; second bottle: amoxicillin (2 vials) + Houttuynia cordata (2 vials) + VB (2 vials) + glucose sodium chloride 500ml), use for 2 consecutive days.
Song Weidong, Shanggao, Jiangxi:Internal three-way crossandexternal three-way crosswhat is the difference
Answer
External three-way crossis a three-way cross combination of three introduced breeds,internal three-way crossis a three-way cross combination containing one or two excellent local breeds.
Li Congjiang, Yizhang, Hunan: What are good ways to deal with a sow biting piglets after farrowing?
Answer
Sow biting piglets is more common among first-parity sows. Because first-parity sows have no farrowing experience, the pain after farrowing makes them think the piglets are harming them. When the sow's milk is relatively poor, she is even more unwilling to nurse. Suggestions: ① put a muzzle on the sow, ② inject chlorpromazine intramuscularly. ③ drench with beer.
Qi Quan, Jingcha Pig Breeding Farm, Liling, Hunan: For group-housed sows, how long before farrowing is it good to separate them for individual feeding?
Answer
If the gestating sows on the farm have always been raised in a group-housing model, they do not need to be separated for individual feeding. It is only necessary to pay attention to fighting stress in the early stage of pregnancy (30 days). In the late stage of pregnancy (90 days), carry out timely late-pregnancy flushing, increasing the amount fed and the reproductive nutrition needed for rapid fetal growth (Zaiduoduo 1kg/t).
Li Yumin: Can a sow with uterine prolapse still be used for the next parity?
Answer
Culling is recommended. Because once uterine prolapse occurs in a sow, it is basically impossible to recover in a short time, making normal production activities impossible, and thus losing breeding value.