Recently, some breeding farm owners consulted with the author. Why did the last time the waterfowl mate end in the breeding season, that is, before and after the spring equinox?
According to the author's experience in waterfowl feeding and management for many years, and after conducting scientific experiments with relevant domestic experts, the author concludes: In the case of cultivating a breeding farm in various parts of the country and excluding the influence of other factors outside the world, it will be on March 10-20. The females who end up breeding are less likely to be pregnant, have more babies, and have a higher survival rate.
After the various nutrients required for the breeding period of leeches have been physiologically met, they will normally heat and mate. But there is also a key factor is the change of the lighting cycle, this important factor is often easy to ignore, so the key period of the breeding of leeches is not good enough to grasp, increase the number of empty mother cubs, mother calf birth, reduced survival rate Case.
Why does light change affect the breeding of leeches, and how can breeding farm owners learn the breeding time of leeches accordingly?
Mink is a fur animal that breeds every spring. When sunlight reaches 11.5 to 12 hours in spring, there will be a prosperous estrus period, followed by a breeding season. This time is usually on March 10-20. If maternal estrous mates in advance, the blastocyst formed after pregnancy will delay implantation. When the sunshine reaches 12 hours or more, the corpus luteum develops rapidly and the blastocyst begins to implant. This is the long-term formation of leeches in the spring equinox. The genetic characteristics are such that Dianzhuang can be born in a warm, food-rich season. Therefore, leeches end breeding every year before and after the spring equinox. In early mating females, due to delayed implantation, the chance of blastocyst death increases, which may increase the empty-return rate, or reduce the number of litters and the survival rate of pupae. To this end, it is necessary to grasp the physiological characteristics of the otters so that the last mate of the otters can be arranged as far as possible during the breeding season.
Experience has shown that the breeding time of leeches generally begins on March 1 and ends on March 20 when the spring equinoxes end. The breeding method used is periodical compounding and compounding every other day. Based on the actual allocation, the compounded females should be able to receive the last mating within the mating season to meet the breeding physiology habits of the otters. In the low-latitude areas of Hebei and Shandong, 11 hours of light came earlier and the otters could mate earlier. However, at this time, the germ cells of leeches were not fully mature and could easily misjudge farmers.
The symptoms of leeches entering the breeding period are the hyperplasia or congestion of the mucous membranes in the mother's fistula, the increase of glandular secretions, swelling of the genital area and accompanied by mucus secretions. Farmers should pay attention to observing the estrus performance of the mother quail, summarizing the breeding end date of the leeches, and the effect of littering. According to the situation in the field, the timing of the best compounding of leeches should be mastered. In addition, farmers need to scientifically grasp the three stages of initial allocation, compounding, and air-supply recapture. Individual leeches have late estrus due to illness or other factors, and they must also take corresponding measures to achieve a match.
Periodical compounding and continuous overnight operation:
1. Periodical compounding. That is, mating is performed three times in two sexual cycles, because the mother-fever sex cycle is mostly 7 to 10 days, and the duration of estrus is 1 to 3 days. After the first match, it should be played once every six days, ie, the seventh day, followed by the eighth. Once in the day or once on the ninth day of every other day, or after the initial allocation, the breeding will be completed after five consecutive days, that is, the sixth and seventh days of continuous reconstitution.
2. Repeat for consecutive days. Some mothers and sisters have only begun to heat during the prosperous period of estrus. They have to adopt a method of continuous compounding, that is, two breedings in a sexual cycle, just in time for the end of estrus.
After the blastocyst implantation, the farmers must seriously feed and manage according to the nutritional standards of the leeches. After 301 days of growth and development, the breeding period will reach the litter. The management of the gestation period will directly affect the calving of the female quail. Breastfeeding and Aberdeen survival rate and growth and development.
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