Sows heat and breeding methods
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Second, estrus symptoms observed from the following two aspects:
1. Behavioral performance Local breeds often have tweets, tumbling, loss of appetite, or stop eating. They like to crawl across other sows or are sowed by the sow, frequently urinating, sluggish, and other external appearances, but the introduced species and their external blood Hybrid gilts show no obvious estrus symptoms.
2. The main symptoms of vulvar changes are redness and elimination of mucus. The estrus began to erythematous and the pus was red and swollen, and the color changed from shallow to dark; during the estrus to its exuberant period, the vulva was removed from the thick, thick white silky mucus.
Third, breeding methods
1. The suitable mating age of gilts for the first-age matching age varies with species type, feeding management level and climatic conditions, but can be judged from the following two aspects: 1 Judging from body weight and age: Precocious local breed 6 months old About 50 to 60 kg of body weight is suitable for breeding. Late-maturing large introduced species such as Changbai, Great White, Duroc and their cultivars, etc., 8 to 10 months after birth, about 100 kg weight when breeding better. If the feeding and management conditions are poor, although the breeding age is reached, but the body weight is small, or the body weight reaches the breeding weight and the age is still small, it is better to postpone the breeding time. 2 According to the number of estrus occurrences, whether it is the Chinese local breeds, or the large introduced varieties and their hybrids, the third estrus breeding after the first estrus is better. This requires the keeper to make detailed observations and make records.
2. Timely breeding This is one of the key measures to increase the number of litters of piglets, and the appropriate breeding time can be determined from the following two aspects: 1 Judging from the symptoms of estrus: judging the estrus should be performed at the touch of two touches and three pressures. Performance, as previously mentioned; two touch the groud to see the status of secretions; three pressure that presses the sow lumbar Department, the sow show stand still, vertical ears lift. At this point the breeding is most likely to be pregnant. 2 Judging from the time of estrus: the ovulation of the sow is 24 hours to 36 hours, with an average of 31 hours. The time for the egg to maintain fertilization within the reproductive tract is 8 to 12 hours, while the survival time for the sperm is 25 to 30 hours. The spermatozoa should reach the site of fertilization 2 to 3 hours before the egg is excreted. Based on this, the appropriate breeding time should be 21 hours after the start of the estrus estrus, that is, breeding on the second day of estrus.
3. Sows ovulation lasts for 10 to 15 hours. Therefore, in order to give full play to the reproductive potential of sows, increase the number of litters, and reduce the anti-foliage rate, it is recommended that two breedings be conducted during the estrus period, with an interval of 8 to 12 hours.
4. Breeding methods and precautions: This manual and artificial insemination. Note: 1 select the venue to be smooth and not slippery; 2 time choices after feeding 2 hours; 3 male and female sows body size can not be too different; 4 mating in winter and rain should be carried out indoors, summer should be carried out when the morning and evening cool; 5 Before the breeding, wash the male and female genitals with 0.1% potassium permanganate solution; 6 Make a record of breeding.