1, caused the wrong time of breeding. When the rams and the ewes are raised together, they will inevitably mate freely and may lead to ewes' pregnancy and lambing throughout the year. This is not conducive to feeding and management, but also is not conducive to the development of the fetus. The resulting lamb is of poor constitution, low overwintering ability and low survival rate. In contrast, ewes produce better lambs in spring and winter, and winter lambs are better than spring lambs. The lambs produced in winter are generally pregnant in July and August. When the grass is lush, the ewes are lush, the ewes have good lye, the heat is estrus, the ovulation rate is high, the conception rate is high, the fetus is well developed, and the body is big at birth, strong and strong, and the cortex special. it is good. When the lambs are weaned, they are catching up with the weather and are able to eat green grass. The growth and development are fast, the survival rate is high, and the amount of shearing is high. Therefore, the rams should be kept separately from the ewes. From July to August, the rams should be selected to mate with the ewes. This will ensure that the ewes will breed lambs from December to January in the coming winter.
2. Inappropriate mating objects. Sheep are generally sexually mature at 7-8 months of age, but are not suitable for mating. Older sheep and sick sheep are also not suitable for breeding. Only healthy sheep aged 1.5-7 years are suitable for breeding. If the ram and the ewes are raised and bred together, they will become pregnant if they are old, weak, ill, or disabled. This will seriously affect the growth and development of the young ewe and seriously affect the elimination of old, weak, sick, and remnants. .
3, can not make full use of improved rams. Sheep are free to mate and inevitably result in inefficient mating and redundant repeated mating, while a ram generally can only afford the mating task of 15-20 ewes. At the same time, the ram's energy consumption will shorten the useful life and cause waste. Therefore, rams should be kept separately from ewes. During the breeding period, artificial assisted mating should be carried out.
4, resulting in unclear blood between offspring. Freedom of mating of sheep is not always sure which ram is the "father" of the lamb. If it is not convenient to choose a species for breeding, it will inevitably be mated by inbreds and cause hereditary diseases, thus losing the "hybrid advantage".
5, affect the ewes normal intake. The rams and the ewes are mixed together. The rams will chase the ewes so often that the sheep will not be at peace. The ewes cannot concentrate on feeding, thus affecting the growth and development of the ewes.
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