First, the choice of breeding sows
In domestic breeds, Taihu and Neijiang pigs can be selected as domestic pigs, and Dabai and Landrace pigs can be introduced. In individual selection, sows with a birth size of 3 to 7 and high-yield sows with a litter size of 12 or more were in the middle, with well-developed breast, genital, and regressive sows and nipples of more than 7 pairs.
Second, master the initial match age and useful life
It is not appropriate for the sows to have early mating age. Early mating not only affects the sow’s physical development, but also has fewer litter size, poorer piglet physique, and higher yield of sows. In the second or third emotional period, it is generally better that the local breed is 6-7 months old and weighs more than 60 kg, and the introduced species is 8-10 months old and weighs 100-120 kg. Sows in the 3-7 fetus reproductive capacity in the best period, there will be a downward trend, so the sow's useful life of 4-5 years.
Third, a reasonable arrangement of breeding season
As the saying goes: Summer infertility and winter produce. For the first time, the animals will be bred in May-May, and will be born in August-September; the second will be breeding in September-October and the second will be born in January-February; Farrowing; such matings are in spring and autumn.
Fourth, proper exercise, control of public opinion
Insufficient movement of sows directly affects heat. By exercising physical fitness, controlling the sensation in 7-80%, overweight and overweight both affect the number of eggs and are not conducive to the estrus of sows.
V. Short-term excellent feeding, plus green
Two weeks before mating, the sows are given adequate nutrition, especially those related to reproduction, such as methionine, VA, VD, VE, VC, choline, zinc, and manganese. Adding a small amount of green fodder to the feed can supplement nutrition and regulate the sensation of the locust. It also meets the habit of pigs eating omnivorous foods. The stimulation of these nutrients can increase the number of ovulation. Never feed mildew feed.
Six, timely breeding
Timely breeding is the key to raising the number of litters, but grasping a certain degree of difficulty, the sows have wrinkles and swelling of the vulva; vaginal secretions were filiform; pressed back or accept the climb; when the standing response can be matched. Adhere to the principle of "with less late, old with the early, many not with the middle and good with early, earth with late, mixed with the middle" principle.
Seven, pay attention to the matching of male and female pigs
Excellent boars with excellent sows, excellent boars with normal sows. In terms of age, young boars are used for young pigs, young boars are used for elderly sows, and boars for young boars are paired with young sows.
Eight, take compound or artificial insemination
After the first breeding interval of 8 to 12 hours, the same or another boar is used for two breedings. Artificial insemination can also be used. It is mainly to ensure that the sows provide the necessary quantity and quality of sperm to prevent pregnancy. Missing timing.
Nine, the implementation of early weaning
Early weaning can restore the sow’s constitution as soon as possible. Normal sows can be estrus 5-7 days after giving birth, sows lose weight 20% during lactation, and there may be a decrease in ovulation number or no heat. Suitable weaning time is 28-35. Days, scattered households 35-40 days. During lactation, the sows do not lose their feed. After weaning, they produce hormones that cause irritation to the sow due to milk reflux.
X. Drug Health
After sow weaning, feeding ovulation No. 2 or No. 3 for 2 to 3 hours prior to ecstasy or mating, and enhancing sexual desire in sows, are all conducive to increased ovulation.
Eleven, pay attention to early pregnancy feeding management
Sows can't feed high energy and high protein feeds within 20 days of pregnancy to prevent embryos from dying early, and they can't be dewormed, given medicine, vaccinated, or scared to prevent miscarriage.
Twelve, far away from reproductive disorders
Blue ear disease, parvovirus, pseudorabies, Japanese encephalitis, swine fever, Brucella, chlamydia, leptospira, and flu all have an effect on reproductive function. Strengthen prevention and control, eradicate hidden dangers, and maintain the health of the pigs so as to develop reproductive performance.
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