Hydra breeding technology

(1) Estrus and mating

In the natural world, the otters do not have a fixed breeding season, and they have copulation throughout the year. Many hunters believe that juvenile otters are mostly in heat in spring and summer. Two children can be born each year, usually one child and two children. Uncommon one-child or three-child.

In captivity, it can only be reproduced when it is over one year old. Estrus time varies by place of origin. In the north, estrus occur from February to April each year; Yunnan otter can have estrus 2 times a year, and in 3-5 months and early September-September, estrus lasts 15-30 days. The estrus mother otter lost appetite, was uneasy, shouted loudly, chased each other, and bite each other. Female vesicles are swollen in the vaginal opening and the testicles protrude prominently.

Mating is often done in water, early in the morning or late in the evening. Before mating, the male and female otters chase and play in the water, and emit a "click" sound and intermittent sharp whistle. Then the mother otters flatten the water on the head, the hindquarters sink slightly, and the male otters quickly climb onto the back of the mother's otters. Live in the head and complete the mating in the swim. Mating time is 5-10 minutes. Up to no more than 30 minutes. When the climate is between -12°C and -6°C, mating can also be done on land.

(b) Pregnancy and calving

After the mother leeches become pregnant, they are no longer fertilized. 54-58 days of pregnancy. The range of change is 52-71 days. Fertilized eggs have a free period. After 30 days of pregnancy, food intake increased, exercise decreased, and the abdomen slightly expanded. Before birth, lying in a small room does not come out, and scribbled to make a nest, the temperament becomes ferocious. In the latter part of pregnancy, the female otter should be provided with a litter box, and soft hay should be placed in the box so that it can be used for nesting.

The time for calf spawning varies from region to region. In northern China, there are mostly litters in spring and summer. In most parts of the former Soviet Union, there are 4-5 litters, Volga basin is littered from June to July, and some regions have late autumn crops and produce only one child each year. In low latitudes, there are no fixed seasons for waterfowl. Each baby has 1-5 litters, but more often than two.

(III) Growth and Development of Tsaizi

Newborn mink has a body weight of about 54 grams, a body length of 14.5 centimeters, and the entire body is covered with milky or light gray lanugo. Eyes closed, three days later, silver gray, seven days later became smoke gray. 28-31 days old blink. Weaning around 50 days of age. After weaning, the juvenile otters can scoop up their nests with mother water and slowly crawl. At the age of 2 months, the mother otters often bring the juvenile pelicans to the water's edge to lure them into the water, or dip the juvenile water into shallow water and force them to swim. In some cases, young swimmers swim back in the water, while young swimmers practice neck exercises with their necks. After a week, you can swim and fish by yourself. After three months, they can live independently and separate.

Tsai bracts grow rapidly. On the 4th day, it weighed 97 grams and was 16.5 centimeters long and 6.7 centimeters in length. 30-day-old body weight of 800-840 grams. At 116 days of age, males weighed 2.25 kilograms and female otter weighed 2.0 kilograms.

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