How to improve the reproduction rate of ewes? How to manage early pregnancy?

Reproduction refers to the physiological process of producing offspring carried out by organisms in order to continue the race, that is, the process of producing new individuals. Then how to improve the ewe reproduction rate? How to manage in the early stage of pregnancy?

How to improve the ewe reproduction rate?

Improving the reproduction rate of ewes is the key to the income of the farm. In order to improve the reproduction rate of ewes, we can start from the following aspects.

1. Multi-lamb rams and ewes are selected for breeding, double lambs or multi-lambs are hereditary, and the previous generation of rams and ewes are preferably selected from the reserve flock of more than one twin lambs. These rams and ewes with good genetic basis are reserved for breeding, which can give full play to their genetic potential and increase the probability of multiple lambs in ewes.

two。 Adequate nutrition makes breeding sheep have healthy physical condition and moderate fat, rams maintain strong libido, a large number of sperm in semen, strong motility and high fertilization ability, and strengthening ewe nutrition is an effective measure to improve the reproduction rate of ewes. When the ewe is strong, the fetus develops well, the postpartum milk is sufficient, the birth weight of the lamb is large, and the survival rate is high. Therefore, the fatter the ewe is, the heavier the lamb is, and the higher the litter rate is.

3. The practice of twice mating and double mating or twice insemination during estrus can increase the rate of quasi-pregnancy and increase the probability of giving birth to twin lambs. The use of twice mating method can keep the sperm with fertilization ability in the reproductive tract of ewes and increase the chance of fertilization. Commonly used method: ewes confirmed estrus, insemination in 12 and 24 hours after each insemination, generally two insemination interval 10-12 hours.

4. To increase the proportion of young and middle-aged ewes in the flock, the fecundity of young ewes and old and weak ewes is not as good as that of adult ewes. In the ewe's life, the ewe has the highest reproduction rate at the age of 3 to 4 years, and the breeding period is generally 8 years. Therefore, in order to improve the overall level of the flock, adjust the flock structure reasonably and supplement the young ewes in a planned way, we should appropriately increase the proportion of ewes aged 3 to 4 years old in the flock, and find and eliminate the old, weak or low fecundity ewes in time.

5. Timely early weaning of lambs and shortening of lactation time of ewes can promote ewes to have early estrus and achieve one-year productivity. Early weaning lambs need to artificially train their feeding ability and feed some fresh grass, vegetable leaves or soft and digestible hay and leaves at the age of 10 ~ 15 days. in order to stimulate the early formation of digestive function of lambs and the transition to independent feeding of lambs.

How to manage ewes in the early stage of pregnancy?

1. Generally speaking, in the practice of sheep production, the pregnancy process of ewes is generally divided into three stages. From the beginning of conception to about one and a half months (45 days), it is called early pregnancy; from one and a half months to three months (90 days), it is called the second trimester of pregnancy; and from three months of pregnancy to delivery (140 days), it is called late pregnancy. Ewes have different requirements for feeding management and forage at different stages of pregnancy. Only by meeting the feeding and management methods and forage standards of pregnant ewes at different stages can the healthy development of the fetus and the physical fitness of ewes be ensured.

two。 Ewes, whether through artificial insemination or natural mating, should start from six aspects in feeding and management once pregnancy is confirmed. First, ewes in the early stage of pregnancy should be managed in groups with other sheep in order to meet the needs of different sheep. Second, we should pay attention to adjust the drinking time, generally adjust the drinking time of ewes in the early stage of pregnancy to after noon. Third, it is best to provide tap water and well water to sheep, and try to avoid drinking river water and snow water to sheep, especially water with ice. Fourth, when going out to graze and drive sheep, it is necessary to reasonably control the speed of movement to prevent rapid driving and strenuous running. Fifth, it is necessary to artificially interfere with the entry and exit of ewes in the early stage of pregnancy to prevent squeezing and trampling. Sixth, sheep with grazing conditions should adjust the grazing time in time, preferably after the sun rises and the temperature rises.

3. In the aspect of forage, it is managed from two aspects. First, it is necessary to timely increase the feed with high protein content (peas, beans, oil, etc.) to meet the healthy development of the fetus. Second, it is necessary to timely increase high-quality hay (legume forage), temporarily do not feed or less silage, especially pay attention to forbidding the feeding of frozen and spoiled silage. At the same time, in the use of veterinary drugs, we should try to avoid the use of diarrhea drugs and temporarily avoid the use of sheep body response more sensitive biological products.