Polyculture is not conducive to grasping the best breeding time
Rams and ewes mixed and bred, will inevitably be free to mate, may lead to ewes pregnancy and lambing throughout the year, is not conducive to feeding and management, but also not conducive to fetal development, the output of the lamb is often poor physique, survival The rate is low.
In comparison, ewes produce better lambs in spring and winter, and winter lambs are better than lambs in spring. Lamb winter ewes are usually pregnant from July to August, when the grass is lush, the ewes have good lyrics, ovulation, high conception rate, good fetus development; the lambs are catching up with the warming of the sheep when weaning. Eat green grass, fast growth, strong wintering ability, high survival rate, high shearing volume. Therefore, it is usually best to separate the rams from the ewes, and to mate with the ewes in July and August. This will ensure that the ewes will breed lambs between December and January. If the ewes produce lambs in the spring, the ewes and lambs can eat grass when the weather gets warmer, so the ewes have enough milk, the lambs grow fast, and there is no need to purchase large amounts of feed, and the cost is low.
Polyculture is not conducive to grasping the best breeding object
Sheep usually mature from 7 months to 8 months of age, but this time is not suitable for mating. In addition, old sheep and sick sheep are not suitable for breeding. Only 1 to 7-year-old healthy sheep are suitable for breeding. If the ram and the ewes are polycultured together and freely mated, then the old and sick, sick sheep and young sheep will become pregnant. This will not only seriously affect the treatment of old, weak, sick and dead ewes, but also the survival of the lambs they produce. The rate is low. Even if it survives, it grows slowly.
Polyculture can not make full use of improved rams
A ram can only mate 15 to 20 ewes. If male and female rams are freely mated, they will inevitably be inefficiently mated. Excessive repeated mating will cause the rams to consume too much energy, shorten the useful life, and cause waste.
Polyculture can easily lead to unclear offspring of blood
Freedom of mating is often not sure which lamb is the father of the lamb, resulting in near mating of offspring, loss of hybrid superiority, and genetic disease.
Polyculture affects normal feeding
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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