1 breeding program
(1) First weaned sow and returning sow, then select gilts based on the full-fledged breeding program, and gilts and return sows need to be allocated three times.
(2) In the initial stage of artificial insemination, it is best to adopt the “1+2†breeding method, that is, the first and second artificial insemination; when the conditions are mature, the “full artificial insemination†breeding method is promoted, and three gradual transitions are required. To twice.
(3) Breeding interval:
Maternal sows with normal estrous within one week: estrus in the morning, first in the afternoon, second and third in the afternoon on the following day, estrus in the afternoon, first in the morning on the following morning, second in the afternoon, and third in the afternoon The third time in the afternoon. Late gestation sows with post- weaning (seven days or more) and relapsed sows and primiparous sows will be given early mating (estrus for the first time) and should be given at least three times.
2 specific methods
(1) The boars with the right size are selected to drive the male and female pigs to a spacious place in the circle to prevent the ground from slipping.
(2) 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 penis of the boar with the female vulva, and be careful not to bend the penis. The mating crew will not be allowed to leave during the entire breeding process.
(3) observe the mating process, to ensure the quality of mating, ejaculation should be sufficient (ejaculation is the basic performance of the anus under the root of the anus dilator muscle rhythm contraction, strength is sufficient), each ejaculation can be 2 times, some of the sub-gonads 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 size of male and female mothers should be reasonable. Some sows that are paired for the first time do not want to cross, and boars that have strong sexual desires can facilitate mating.
(5) Refer to the principle of "early with early, less with late, not many with the middle" principle: after the estrus of the higher parity (more than 5 children) sows, the first appropriate early allocation; low parity (2 (5-fetal) After the estrus, the sows are suitable for the first time.
(6) During the hot season, breeding should be performed before 8 o'clock in the morning and after 5 o'clock in the afternoon. It is best to fast breed before feeding.
(7) Perform estrus inspection and breeding records: Discover estrus pigs and 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.
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