【摘要】 湖羊胎儿肝、肺、肾、心脏相对早熟,妊娠前期增重大,发育快,肠、胃、胸腺、胰腺、睾丸增重集中在后期;100日龄特别是130日龄以后,是胎儿绝对增重的高峰期,体尺的增长集中在130日龄以前,双羔和三羔胎儿生长发育上的差异自100日龄开始明显,符合一般规律。60～70日龄胎儿头部毛纤维首先穿出皮肤,130日龄体躯被毛出现1～2个弯曲,140日龄变成完整的“S”形弯曲,形成清晰的波浪花纹。为缩短羔皮被毛长度、生产优质羔皮,可于妊娠135～140日龄实行人工引产;为保证妊娠母羊、胎儿及产后哺乳的营养需要,应从妊娠两个月左右开始加强饲养,但饲养水平与羔皮品质的关系尚需探讨。更多还原

【Abstract】 The liver, lung,kidney and heart are relatively early mature. In the early stages of pregnancy , these organs develop fast and gain more weight than that of in the late stages. But the development of intestine, stomach,thymus, pancreas and testicle occur in the late stages of pregnancy. The highest peak of weight gain of the fetus is reached only after 100 days, especially after 130 days of pregnancy, while the increase in body size measurements occur before that time.The growth and the development of twins and triplets begin to differ from each other from 100 days after conception. This is in conformity to the general biological law. On the 60-70 days of pregnancy, wool fibers first appear in the head region of the fetus; on the 130 th day, the wool on the skin of the body proper begin to form 1-2 curls; on the 140th day, they begin to take the shape of a "S" curl, so as to combine with other wool fibers to form a distinct wavy pattern. In order to shorten the length of wool and to help the formation of a fine quality-lamb-pelt, it is advisable to induce early parturition on 135-140 days of pregnancy. As a guarantee the nutrient requirement of the pregnant ewe, the fetus and the lactation after parturition, the increase of nutrition level should be started at two months of gestation. The relation between nutrition and the quality of the lamb-pelt remains to be investigated.更多还原