Because a rodent is a rodent, it has a longer gestation period than other animals. The fetus develops slowly in the first half of the period. It is difficult to judge whether it is pregnant from the outside, but after the pregnancy, we can judge from the following aspects.

1 Performance from the mother beast. The maternal animal cycle stops, there is no estrus performance, and it is not willing to be close to the beast, no longer accepting mating. When the pregnancy is 80-90 days, the abdomen is obviously rounded, the nipple becomes bigger, the movement is slow, the movement is reduced, from the appearance of the body. Easy to identify.

2 tires. At 40-50 days after pregnancy, the length of the embryo can reach 1.5-2 cm. In this period, pregnancy can be diagnosed by treading. The operator grasps the tail of the mother animal with his left hand, puts the front paw of the mother on the table or other non-high objects, and touches the right hand from the chest backwards under the abdomen. If you can touch the soft and elastic small spherical embryo, It can be determined as a pregnancy. When you touch it, you should be light and you should not use too much force. In particular, you should not catch the tail suddenly to avoid abortion. Except for special circumstances, it is not recommended to touch the tires.

3Measure the size of the nipple. Some people have introduced pregnancy to determine the pregnancy by measuring the change of nipples in the gestation period, but because the differences between the individual raccoon are large, and the range of nipple changes is not very obvious, especially the measurement error in the early stage is also very large, practical value in practice. Not big.

From the above several discriminating methods, it is not very safe, and it is very accurate to diagnose the early method of whether the coypu is pregnant. In practice production, we oppose the use of touch to judge pregnancy, which is easy to cause miscarriage, and it does not make sense. The best way to judge a predator's pregnancy is to estrus again. The sexual cycle of the nutria is about 24-30 days. If the coypu has no estrus after about 40 days of breeding, it is judged to be pregnant and fed according to the feeding standard during pregnancy. In the first 40 days of pregnancy, the coypu has a slow development of the fetus, and the original nutrient supply can meet the developmental needs of the fetus. Therefore, it is not necessary to judge pregnancy prematurely.

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