1 . Breeding program
(l) First weaned sow and return sow, then select gilts based on the full-fledged breeding program, and gilts and return sows need to be bred three times.
(2) In the initial implementation of artificial insemination, it is best to adopt the “1 + 2†breeding method, ie, the first 1st handover, the 2nd and the 3rd artificial insemination; when the conditions are mature, the “full artificial insemination†breeding method is promoted and should be consisted of 3 Gradually transition to 2 times.
(3) Breeding interval: Normal estrus sows in 1 week: estrus in the morning, 1st in the afternoon, 2nd and 3rd in the afternoon on the next day; estrus in the afternoon, 1st in the morning on the following day. , the second time in the afternoon, and the third time in the afternoon on the third day. Late gestation sows with post- weaning (over 7 days) and relapsed sows and primiparous sows will be given early mating (estrus for the first time) and should be given at least 3 times.
2 . Method of breeding
(l) The boars with the right size should be selected and the male and female pigs should be rushed to the spacious area of ​​the circle to prevent the ground from slipping.
(z) Auxiliary breeding: Immediate assistance once the boar begins to climb. If necessary, use your legs to hold the mated male and female sows and prevent the boars from squeezing the oversized sows and then stop the mating. Standing behind the boar to assist the penis into the vagina: Using sterile gloves, align the boar's penis with the sow's vulva, and be careful not to bend the penis. The mating crew will not be allowed to leave during the entire breeding process. One head will be allocated and one head will be allocated.
(3) observing the mating process, to ensure the quality of mating, ejaculation should be sufficient (the basic performance of ejaculation is the rhythmic contraction of the anal dilator below the tail of the boar rhythm, full strength), 2 times per ejaculation can be, some of the paragonads or liquid Outflow from the vagina. The entire mating process must not be disturbed or rudely treated with male or female pigs. After mating, the sows return to the original circle, fill in the boar species card, and sow record cards.
(4) When mating, the proportion of males and females should be reasonable. Some sows that are paired for the first time are reluctant to accept cross-breeding. Boars with strong sexual desires can facilitate mating.
(5) Refer to the principle of “early with early, less with late, and not more than middleâ€: After sows with higher parity (more than 5 tires) are estrused, the first time they are properly allocated; the number of times is lower (2 After the estrus of a five-month-old sow, the first time it was appropriate for the first time.
(6) During the hot season, breeding should be performed before 8 o'clock in the morning and after 17 o'clock in the afternoon. It is best to fast breed before feeding.
(7) Perform estrus inspection and breeding records: Discover estrus pigs, register ear numbers, column numbers and estrus time in time.
(8) Boars should not be bathed and strenuously exercise immediately after mating, nor should they drink water immediately. If breeding after feeding must be separated by more than half an hour.
3 . Precautions for breeding
(1) The breeding time should be better than 2 h after eating, and the summer hot weather should be performed before 18 o'clock in the morning and before. Rain or blizzard weather should be mated indoors.
(2) The breeding site should be far away from other boars. The ground should be flat but not smooth so as not to hurt the boar.
(3) Keep the environment as quiet as possible during breeding. Do not shout or whip boars or sows.
(4) After mating, gently press the middle part of the sow in the hand to prevent backflow of semen and cause empty or sympathy.
(5) Breeding age: The first time the local pig is 8-9 months old, the weight is 60-70kg, and the introduction or hybrid pig is 9-10 months old, and the weight is lookg. Sows have the highest fertility from 3rd to 8th, and boars generally have a life span of 3-4 years. The best breeding time: The breeding of pigs is not seasonal. It can be used in all seasons of 1 year. The duration of estrus in the sow is 3 to 5 days. Therefore, the estrus should be bred one to 15 days after estrus, and the sow should be re-used every 10 hours. And can increase litter size. The sow's estrus cycle is 15 to 21 days.
(6) Don't bathe, feed cold water, or lie in a cold, damp place immediately after mating, so that the boar does not get cold.
(7) The proportion of male and female pigs is appropriate, and the natural mating ratio is generally 1:20 to 25, and artificial insemination is generally 1:100 to 200.
(8) Frequency of use: young boars 4 to 5 times/week, old boars 3 times/week mating use.
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