森多地区绵羊放牧育肥适宜时期的研究

对森多地区不同类别的３组藏系绵羊，在６０天的放牧育肥内进行各旬增重率的测定，得出该地区绵羊后期放牧育肥的适宜时期为８月末正１０月上旬。其中１８月龄幼年羯羊组在４０天有效育肥期内的增重和增重率达到５．２６ｋｇ和１７．７４％，分别比３．５岁以上的成年羯羊组高２．０８ｋｇ和１０．９５个百分点；淘汰母羊前期由于哺乳、复壮推迟，但在后期４０天放牧育肥中，绝对增重量达到６．１４ｋｇ，增重率仅低于幼年羯羊组２．

Study on the Optimum Period of Sheep Pasture Finishing in Shenduo Region

Three group of different types Tibetan were deterimined the every ten day rate of liveweight growth(RLG) within 60 day pasture finishing period(PFP) in Shenduo region.It showed that the optimum PFP of later stage was from the end of August till the first ten day period of October in this region,the weight gain and RLG of 18 month year old young wether was 5.26kg and 17.74% resp. in effective 40 day PFP,this two values was higher with 2.08 kg and 10.95 percent for over 3.5 year old adult wether.The draft ewe,becaused of sucking period and renovation was postponed in earlier stage,but in the later stage of pasture finishing,the absolute weight gain was 6.14 kg and RLG was only lower with 2.22 percent for young wether,it declared that they have very strong compensation. \ \