1 Morphology of the coypu character The appearance of the coypu is similar to the otters, the body is round and short and thick, the head is large, the upper lip has long brown long hair, two pairs of yellowish brown incisors protrude outside the lip, the eyes are small round and the coat is brownish yellow There is a freely-closed meat flap in the nasal cavity. The limbs are short and the hind limbs have a hernia. The tail is conical, with dark gray horny scales.
Adult females have body weights of 5.5 to 6.0 kg, weights of up to 10 to 13 kg, body lengths of 50 to 65 cm, and tail lengths of 30 to 40 cm. Males are 10% to 20% heavier than females. Male rats do not have scrotum and testicles are hidden in the abdominal cavity. Male and female individuals are not easily identified on the appearance.
2 Coypu habits The coypu is a semi-aquatic, herbivorous rodent. They live in streams, lakes, rivers and swamps where they do not freeze all year long and live in the wild. They are good at swimming. Living in a cave that is 3 to 5 m long and 1 to 2 m deep, or nested in water and grass, the cave has no branch holes, and the nest is like a grave. There are many vegetation around the holes and nests as cover.
The coypu has a weak vision, is sensitive to light and likes nocturnal activities. Sensitive to hearing, it can perceive the subtle sounds around the environment, especially when there are natural enemies. Every year, the hair is changed once and there is no obvious hair change every year. The hair change is obvious from March to May and from August to September.
The coypu is more clumsy on land, is comfortable in water activities, and is good at diving and swimming. Its life span can be 8 to 9 years. The natural enemies are mainly carnivores and raptors.
3 Breeding of the Coypu
3.1 Breeding characteristics of the coypu The reproduction of the coypu has no obvious seasonality, that is, it can reproduce all year round. The first occurrence of estrus occurred at the age of 5 months of age when the rats were 1.8-2.2 kg body weight. The females only had estrus at this time. Only when the age was 10-12 months, the female rats could ovulate. Female mice can be estrus for multiple times a year and can produce 5 times in 2 years. Regarding the sex cycle of beavers, scholars have different opinions. Kraetge (1937) thought that the young rats have a sexual cycle of 24 to 27 days, and old rats have 27 to 29 days; Skowron-Cendrzak (1956) believes that the young rats have a 17d sex cycle. The aged mice were 19 days; Wilson (1962) believed that the coydian's sexual cycle was 5-18 days. Female mice can be estrus within 3 days after giving birth and can be allocated to blood. Ninety-two percent of the female rats that had blood on the first day post partum were able to receive compounding on the second day, but females that had blood mating on the second day generally did not receive compounding.
3.2 Ocellaria estrus identification The estrus identification of artificially reared females requires a combination of genital observation and behavioral observations. When the female is estrus, the vulva is flushed, swollen and moist, and mucus emerges from the vagina. Irritation, loss of appetite, frequent urination, strong urine odor, squatting outside the nest. Unestrused females have a closed vulva and a calm temperament. The estrus male rats are similar to female mice but have a certain degree of mate preference.
3.3 The paired species of coypu are stimulatory ovulatory animals. They can be mated in water and on land. They can mate 2 or 3 times in one estrus and the males who mate will end up screaming slightly. When placing a pair, the female mouse should be placed in the male cage from the corner of the cage so that the male can see the female into the cage and avoid biting the frame caused by the disturbance. According to the season, the time is flexible, spring and winter choose 9 to 11 hours and 14 to 16 hours, summer and autumn choose 8 to 10 hours and 16 to 19 hours, and there are three kinds of breeding methods.
3.3.1 Single-male single female mating regularly According to the mating plan, the estrus female rat is placed in the male cage and mated. After mating, the female rat is put back into the original cage, compounded the next day, and compounded 2 or 3 times. When females who had not been assigned to 5 to 6 days were allowed, they could be re-placed and reconstituted after 20 days. In this way, females have high fertility rates and the pedigree of the pups is clear.
3.3.2 Mono-male and female-male mating A male mouse and 5 to 6 female mice are co-cultured in a cage for a long period of time and allowed to mate freely. Females are checked twice a month regularly to confirm that pregnant females are kept alone. The baby was suckled and sucked until the weaned mice were weaned and returned to the original cage.
3.3.3 Polymial polygamy breeding Three to four male mice and 25 to 40 female mice were co-cultured in a cage. The mating methods and examinations were the same as in 3.3.2.
3.3.2 and 3.3.3 can effectively use the construction area of â€‹â€‹cages on the farm and reduce the number of male rats. However, the pedigree of the offspring is not clear and it is difficult to establish a clear pedigree.
3.4 The coypu pregnancies Compared with other rodents, the coypu gestation period is longer, that is 1332.5d, pregnant female mice are not allowed to close but also refused to match, to determine whether the female pregnancy can use the mold method. After 40-50 days of mating, grasp the tail of the female mouse with your left hand and place the forepaws on suitable height objects. The right hand should gently touch along the sides of the abdominal cavity. If you feel soft and elastic spherical objects, then the embryo is Note that the feces ball and the embryo, dung ball hard inelastic), when the pregnancy up to 80 ~ 90d, the appearance of visible changes in abdominal circumference.
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