First, leeches breeding technology
1. The breeding season usually has a gradual decrease in the latitude of the breeding site, but generally it is from the end of February to the end of March, lasting 20 to 25 days. The breeding season is mostly concentrated in late March. 2. Breeding methods According to the characteristics of periodical estrus in female fleas, the breeding mode of leeches can be divided into two types: periodic compounding and reciprocal compounding.
[Cycle recombination] In an estrus cycle, mothers copulate twice (1 + l or 1 + 2) for two consecutive days or every other day is called periodical compounding.
[Isophase compounding] More than two matings are performed in more than two estrus cycles, known as heterophase compounding. The heterogeneity compound is divided into two estrus cycles (1 + 7 - 9) and two cycles with 3 times (l + 7 - 9 + 1 or l + 7 - 9 + 2). .
Experiments have shown that mothers who have been assigned before March 12 (mostly mother-in-law) adopt 1 + 7 + l -2 breeding methods, and mothers who were born after March 12 (mostly early When females adopt a 1 + l or 1 + 2 breeding method, females have better reproduction effects.
Individual mother lice (3 - 5%) no longer receive compounding after they are initially assigned, and thus naturally form a mating.
The water pod breeding period is generally divided into the following three stages:
Initial allocation phase: The initial allocation phase is about one week from the beginning of the initial allocation to the peak of the mating season. The Northeast region is March 5-12. The main task of this stage is to make most of the mothers and muttons reach a mating, focusing on the training of the public breeding school of the year. Only one time per day for public money, once in a row, 3 to 4 times, depending on the situation. The maternal estrous is older than the first born mate, so the first mating stage should pay attention to the mating of the old maternal baboon.
The compounding stage: that is, about one week of the entire breeding season, and the northeastern region is March 12-18. The main task of this stage is to complete two reconstitutions of the estrus mother (including mothers who have been mated for the first time). After March 13th, the mother-in-law who arrived at the first match must continue to be reconstituted. At this stage, male prostitutes can be mated 2 times a day, first with the mother-in-law and then with the mother-in-law.
Check-air-supplying stage: After March 18th, the mother-fighting mothers who have not yet had the initial mating and the mating end date early, the mating time is short, and the male semen quality is poor will be selected in due course. , to be assigned two consecutive times.
3, breeding technology
[Emotional appraisal] Mainly to check the external genitalia, supplemented by the trial situation, and combined with comprehensive performance judgments, mostly in the form of “see, check, and releaseâ€. Look at the performance of the performance: When the public elk is in heat, it is irritated and irritated. It often lingers in cage nets and suffers from poor appetite. It often makes a whining for the spouse. The temperament is usually warmer than usual. Mother estrus, estrus, tend to the opposite sex, mental excitement, loss of appetite, often in the cage net activities, sometimes in the cage or abdominal abdominal cage, urination increased and yellow-green.
Examine the changes of the external genitalia: The estrus male genital testicles are markedly increased in sagging and elastic when touched. Before the female estrus estrus, the urinary hair is bundled and the vulva is covered by urinary hair. When estrus occurs, the vulva has obvious morphological changes. Generally divided into three phases according to the degree of swelling of the vulva, color and mucus changes. Early estrus: Blocking urine slightly apart, the labia starts congested, swollen, slightly eversion, white or pink.
In the middle of the estrus period, when the estrus is escalating, the urinary hairs are clearly separated, and on both sides, the labia is swollen, protruding or valgus, and some are divided into several petals, showing milky or pink, mucous membranes are moist, and the vulva secretes white or yellow mucus. This is the optimum period for mating.
In the late estrus, the labia was swollen, valgus began to subside, the mucous membranes were dry, wrinkled, and pale, and the secreted mucus dried into a craving. Individual estrus mothers have no significant changes in the vulva, known as "hidden estrus." Put on the trial situation: When there is no significant change in the mother's vulva, put it in the cage. The estrus's mother is chased by the public and has no hostile behavior. When the male cockroach climbs, the tail is tilted to one side and the dog is docilely accepted. Mothers with poor heat or heat, resisting public chasing and climbing, attacking male heads, or standing in cage corners, shrieking screams. If you see this situation, you should immediately grab your mother-in-law, return it to the original cage, and try again when the heat is good. [Right-to-approach] Generally, the mother-in-law is placed in a public cockroach. Because the male-family elder is used to its home environment, the time for mating can be reduced. In the event that the public mate is eager to mate and behave violently, the male lice can also be transferred to the female lice cage for mating. If the male scorpion is desperately biting in his cage, the female screams, refusal to match, or public squatting, hitting the female niece with his head or buttocks, and pushing the female squeal to the corner, he should immediately grab the female scorpion and stop the release.
When the otters mate, the male squats on the back of the mother's neck and holds the abdomen of her mother's abdomen. The male lower abdomen clings to the buttocks buttock and the waist arches are at right angles. When the male ejaculates, the eyes are quilted, the hips are forced forward and the hind legs are slightly trembled. The mother-in-law closed her eyes and occasionally whispered.
Fake with public eyes and thief The back of the hindquarters cannot be at right angles or acute angles to the cage net. When walking, the male and female hips were lifted and observed from the cage net upwards. The penis was exposed on the outside of the mother's body. Attention should be paid to the difference. In the course of the release, if the public hustle and bustle embrace the mother-in-law, the mother-in-law is very docile, but when she suddenly screams and struggles to break away, it may be that the male cock is mistakenly anal and should be separated immediately. When such a female cockroach is properly placed, the male cockroach should be replaced or the anus sealed with tape. Mating time: short for 2 - 5 minutes, the elderly for several hours, usually 30 - 50 minutes, the more late to mating, the longer the mating time 6 mating time of 10 minutes and observed that the public ejaculation ejector Both are valid. After the mating is over, the mother must be returned to the original cage in time.
[Training and use of public funds] Kinds of training for public funds: This is the main task of the initial allocation phase. The rate of mating of public males in the early mating stage should reach 80% or more. It is difficult for the male to mate for the first time, but once the mating is successful, it can be successfully mated with other females. Therefore, when training small public funds in the same year, we must choose maternal cervix and gentle temperament to mate with them. We should prevent rough intimidation and public beatings, and be patient.
Use of public breeding: For adult males with strong mating ability, the number of mating should be controlled at the beginning of breeding. Some male cubs have poor initial breeding ability, but they are stronger in the later period and can use it to complete the outstanding breeding or finishing task in the later period. Some male prostitutes will lie down and collateralize, and they must focus on their use, specifically with those who are difficult to match.
The number of matings for the entire breeding period should not exceed 20 times.
[Assessing Supplementary Measures] For females with closed vulva closures, you can use the hand to gently open the pubic hair, and then insert the vulva into the thicker dropper. After the vulva is expanded, select the male deer with strong breeding ability to mate with it. -
For females that do not raise the tail during mating, place the front and rear tips with a thin cord, and then pull the string from the top of the cage. When the male copulates, gently pull the string by hand to adjust the mother. The height of hindquarters makes the mating complete. For mating females who do not stand at the bottom of the abdominal cage and do not stand on the hindquarters, they can use their hands or sticks to hold the mother's abdomen and maternal abdomen.
For females who have a significant change in the vulva but refuse to accept mating, they can take advantage of maternal nephew assisted mating. In the later period of mating, when the female cricket with obvious changes in the genital area licks the male fleas, the male fleas with strong breeding ability can be bred, or the medical rag can be used to mate with the male cricket after covering the mouth and the four claws.
4, semen quality inspection semen quality inspection should be carried out in an indoor room at 18-20 °C, with a glass rod or pipette from the vaginal maternal vagina just absorbed a drop of semen, diluted with 1 drop of normal saline, put on the slide, 200 - 600 times under the microscope.
If after several inspections, it is found that there are a large number of dead spermatozoa, abnormal spermatozoa, or male spermatozoa in the semen to stop use, and the female cockroach mated with it is promptly reconstituted with other male cockroaches. When it is found that the quality of semen is generally not good, promptly identify the reasons and take appropriate remedial measures.
Second, Aberdeen keep live technology
From late April to late May, it is the littering period of mother-in-law, and the keep-alive technology of Aberdeen is an important part in the production of mink.
1ã€Fat check and care
Postpartum check is an important measure to ensure birth and birth, and it should be conducted by listening, seeing, and examining. If Aberdeen seldom barks or occasionally screams, the voice is short and loud, the mother's appetite becomes better, her nipple is ruddy, full, and her mother is strong, which means that she is healthy. In the first inspection, it should be performed in time after the mother's cockroaches expel the black excrement of the oil. The method is to induce the mother cockroach out of the room and close the door. Healthy Aberdeen huddled in a nest and became full-fledged. When you see the nose of the Aberdeen, the dust on the surrounding hairs, the fluff on the abdomen of your mother's abdomen, and the abdomen full, it means that you have eaten milk. If the normal Aberdeen does not eat milk, it is necessary to check whether the mother's beak is deficient or milkless; if the plush around the mother's sucking nipple is not pulled out, it can be manually assisted in pulling; if it is squeezed, the mother's beak does not have milk. In the absence of milk, some or all of them may be placed in foster care. Do not smell on your hands when checking.
In the first 3 days of childbirth - 5 days, we must pay close attention to the situation of the mother and the baby, and find that the mother does not care for the baby or the baby, and when the call is getting weaker and weaker, we must check it so that we can take timely Rescue measures. If the cries are normal and the mother and mother are good, do not check frequently. A litter size 3 can reduce the number of inspections after 5 days, but it is also necessary to pay close attention to the situation of the mother's lactation. In case of insufficient milk or poor quality, it is also necessary to adopt alternative measures at any time. 2, Aberdeen Dai behalf
When the mother has excessive litter size, insufficient breast milk, or poor motherhood, she can find another mother-in-law “mother†who has nurturing ability. On behalf of the foster family, they can place the nursing siblings directly in the “maid†nest, and they can also be placed in the nest at the door of the “mother†room. Note that the birth period and size of the newborn and newborn should be similar, and the nourishing body should not be contaminated with odor: 3, promote the mother's lactation
Mothers with postpartum lactation can induce prolactin by injection of thyrotropin-releasing hormone (LTH). Adding milk or egg feeds to feeds for calving sows or replacing them with soy milk can also be used. The feed during lactation should be adjusted to be slightly thinner. 4, Aberdeen feeding
At the age of 20 days, Aberdeen began to feed on feed, but at this time it had not yet blinked, and the female quail sent feed to the small room. If the mother-in-law does not send feed to the chamber or send it very little, the J can feed into the dichotomous chamber.
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