Feeding and Management techniques of breeding ewes in breeding Hu Sheep

The sexual maturity of Hu sheep is from 4 to 6 months old, but the body maturity is from 8 to 10 months old, the first mating of Hu sheep is from 6 to 8 months old, and the utilization period of ewes is 3 Mel 6 years. The estrus cycle of Hu sheep was 15 murine 19 days, with an average of 17 days, and the estrous duration was 26 murine 36 h, mostly 30 h. The time of ovulation is 26 hours after the beginning of estrus, the time of maintaining fertilization ability after ovulation is 15 words 24 hours, and the time for sperm to maintain fertilization ability is 30 words 48 hours. The first estrus of ewes after delivery was at 25ml 46 days, and the earliest estrus was about the 12th day. The general principle of the feeding and management of ewes is the restriction of feeding during pregnancy and the open feeding during lactation.

Ewe feeding and management should be strictly divided into four stages:

The main results are as follows: 1) the operation rules of feeding and management of ewes from weaning to adult ewes: the purpose of feeding and management at this stage is to restore ewes' physical strength, quickly regain fat, and promote ewes to estrus early, ovulate more, and mate early.

① carries out short-term optimal feeding to ewes one month before mating, maintaining the amount of feed in the later stage of lactation, providing high-quality hay and concentrate, and adding additional nutrition to those with poor body fat.

② carries out double mating and repeated mating to increase the conception rate and litter size.

③ should pay attention to breeding hygiene. Before mating, scrubbing and disinfecting the genitals of rams and ewes should be carried out according to the operating rules. The asphyxiating apparatus and vas deferens should be disinfected under high pressure.

④ strengthens artificial observation and ram test, discovers ewe estrus in time, and mating in time. Especially the first estrus after childbirth, to correctly grasp, this is the second child in a year, is very critical.

⑤ made a good selection plan and made a good record of mating.

2) the operation rules of feeding and management of ewes from maturation to 90 days of pregnancy: the purpose of feeding and management at this stage is to promote the smooth implantation of fertilized eggs in the uterus and increase the conception rate and live litter size.

After 30 days of mating, ① ewes should immediately lower the feeding standard to promote the early production of progesterone, make the fertilized eggs implanted smoothly in the uterus, increase the conception rate and increase the litter size.

The first month of pregnancy in ② ewes is a critical period for fetal preservation. It is necessary to ensure a peaceful life of ewes and prevent embryo absorption and abortion.

③ can be fed properly from 31 to 90 days of pregnancy, but at this stage, fetal growth is limited, ewes are mainly hay, and 0.2-0.4kg concentrate can be fed properly.

④ in 90 days of pregnancy, once a somatic worm.

3) the operation rules of feeding and management of ewes from 91 days of pregnancy to delivery: the purpose of feeding and management at this stage is to reserve physical energy and body fat for ewes to lose fat during lactation so as to improve their lactation ability. Provide nutrition for fetal growth, increase fetal birth weight and improve lamb survival rate.

Ewes in the third trimester of ① have a particularly good appetite, so it is necessary to prevent overfeeding and cause anorexia after delivery. It should be fed properly, but not open to feeding.

Ewes in the third trimester of ② should be in good physical condition and should be fed three times a day, and concentrate should be gradually increased. According to the fat condition of ewes, the diet standard is concentrate 0.45kg, carrot 0.5kg and hay.

③ should supplement bone meal 10g/d and salt 10g/d to prevent fetal osteomalacia and ewe postpartum paralysis.

④ does breast health care, regularly cleans breasts and nipples, and keeps breasts clean and hygienic.

⑤ reduces coalescence and expelling exercise to prevent abortion. If there are symptoms of threatened abortion, progesterone should be injected immediately to protect the fetus.

⑥ adequate supply of drinking water to prevent ewe constipation, such as ewe feces dry knot, 0.3% sodium sulfate should be added to the concentrate.

4) operating rules for delivery management:

The gestation period of ① Hu sheep was 146murl 161 days, with an average of 152days. Ewes should enter the lambing pen in the lambing room 7 days before the due date, and have a special person on duty to prepare for delivery. Three days after delivery, ewes and lambs are raised in a two-square-meter pen.

② should wash the breasts, squeeze out the breast plugs, wipe the hindquarters, and disinfect the breasts and hindquarters before delivery.

③ advocates fasting delivery, giving ewe bran salt soup and adding a little brown sugar before and after delivery.

The ④ midwife should carry out technical training to know the fetal direction, fetal posture and fetal position of the lamb during delivery, know the techniques of midwifery, and know the rescue of fake dead lambs.

The contraction 15min of ⑤ ewes occurs about once during delivery, about 20 seconds each time. The delivery time of the fetus is generally no more than 2mi 3 hours. The placenta should be delivered within 3 hours after the birth of the fetus. If there is any abnormality, it should be reported to the technician in time. If the placenta is retained, dicatron 10ml should be injected immediately and oxytetracycline or ciprofloxacin 1 Mel 1.5g should be padded into the uterus to prevent endometritis. Lochia should be washed for 5 times and uterine inflammation must be eliminated during the lactation period.

⑥ should be treated and treated in time to prevent mastitis and lack of milk in ewes.

⑦ does a good job of weighing, marking and recording.

5) the operation rules of feeding and management of lactating ewes: the purpose of feeding and management at this stage is to promote more feeding of ewes, improve their lactation ability, prevent ewes from losing too much fat and enhance their ability to reproduce again.

① ewes should be fed gradually 5 days after delivery, the diet should be supplemented with concentrate 0.45kg, and high quality hay 3-3.5kg, carrot 1.5kg, bone meal 10g, salt 10g, hay should be fed freely. To increase the feed intake of ewes and maintain their exuberant appetite is the key to feeding and management during lactation.

② also needs extra 0.2-0.3kg for ewes that give birth to twins and three lambs.

By observing ewes' appetite, losing fat and lamb growth, ③ can understand the lactation status of ewes, determine the feeding standard and ensure the safety of ewes.

④ often checks the rumen condition and breast care of ewes to prevent rumen disease and mastitis.

Excessive fat loss of ⑤ ewes is often a comprehensive factor of disease and nutrition, so it is necessary to strengthen nutritional supply and early weaning so as not to affect reproduction.

⑥ should be reduced one week before weaning and the diet can be reduced to 0.3-0.4kg to prevent the occurrence of mastitis.