| Seasonal dynamic changes of biomass and mix-grass nutrientingre- dients after exclosure in the Naqu region of Tibet were studied in this experiment. Three crossbreed goat (Bohr goat X Locate goat) with permanent rumen cannulas were used to measure degradability of DM of grass in summer (August) and winter (February). 48 Tibet cashmere goat were used to carry out supplementary feeding experiment(SFE), which lasted six weeks. SFE was made up of four treatments(one was control, three were trial), and each treatment group consisted of 12 pens of 1 goat. Results:1. the biomass, nutrient ingredient (CP, EE, NDF, ADF, Ash, Ca, P, Fe, Cu, Mn, Zn, Mg, Na, K) of grass inside and outside exclosure had not prominent difference(p>0.05).2.Nutrient ingredients inside and outside the exclosure had great changes in different seasons. The dynamic changes of CP and EE liked single kurtosis, maximum of CP appeared in July and August (9. 33%—12. 03%) , and minimum of CP appeared in winter (2. 62%-4. 36%) ; maximum of EE appeared in August and September (3.17%-4. 36%) , and minimum of EE appeared from December to March (2.02%-3. 06%) . The dynamic changes of NDF and ADF were reverse liked 'V curve, maximum of NDF appeared in August (47. 21%-61.45%) , and minimum of NDF appeared in December (67. 21%-69.15%) . The dynamic changes of Ash and Ca were similar, maximum appeared at the end of winter and beginning of spring(Ash, 11.15%-21. 53%;Ca, 0.81%—1. 49%), and minimum appeared in winter (Ash, 7. 53%-11.76%;Ca, 0. 67%-1. 00%) . The dynamic changes of P likedsingle kurtosis, maximum appeared in July and August (0. 12%-0.1528%) , and minimum appeared in February (0. 0005%-0. 0006%) .The contents of Fe, Cu, Mn, Zn, Mg, Na, K in different months were different, the content of Fe was excessive badly(481 mg/Kg -6862mg/Kg), the content of Mn(55.11 mg/Kg-127. 54 mg/Kg) and Mg (0.l%-0. 28%) was contented in goat nutrition requirement, the content of Cu(2. 71mg/Kg- 9. 30mg/Kg) was partly absent, the content of Zn(8. 31mg/Kg-27. 82mg/Kg) and Na(0. 01%-0. 07%) was absent. 3.Dynamic degradability of DM of mix-grass: in summer P=58. 59+29. 31*(l-e-0. 0646t), R2=0. 9988 n=7 in winter P=19.16+48.17*(l-e-0. 0322t), R2=0.9907.n=74. SFE result indicated ADG of 3 supplementary treatments were 0. 047 ±0. 018Kg/d, 0. 045±0. 012 Kg/d, 0. 046 + 0. 021Kg/d respectively, and markedly higher than control treatment (-0. 0002 + 0. 019Kg/d) (p<0. 01), and there was no difference among 3 supplementary treatments (p>0. 05) . ADFI of 3 supplemental treatments were 0.134 + 0. 026Kg/d, 0. 108 + 0. 021Kg/d, 0. 131 ± 0. 017Kg/d respectively, and there was no difference among 3 supplementary treatments (p>0. 05) . F/G of 3 supplemental treatments were 3.17+1.11,2. 33 + 0.74,4.17 + 3.18 respectively, and there was no difference among 3 supplementary treatments (p>0.05) .5. The dynamic changes of biomass inside and outside exclosure liked single kurtosis, maximum appeared in August (20.90gDM/m2-34. 70gDM/m2) , and minimum appeared in March (4. 4gDM/m2-ll. OgDM/m2) .
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