The chemical composition and in vitro gas production were measured using chemical analyses and in vitro gas production method of artificial rumen to investigate the nutritive values and nutrient supply of cold- and warm-season pastures from high-cold steppes of Tibet region. Four pastures from cold- and warm-seasons in Dangxiong and Naqu (WSP-DX, CSP-DX, WSP-NQ and CSP-NQ) were used as treatment feedstuffs in a single factor experimental design. Rumen fluid used in the in vitro gas production test was taken from 3 Datong donor yaks with permanent rumen fistulas. The results showed that the contents of ether extract (EE), acid detergent lignin (ADL) and acid detergent insoluble protein (ADICP) had no significant differences among 4 pastures (P>0.05), while there were significant differences in the contents of dry matter (DM), crude protein (CP), crude fiber (CF), crude ash (Ash), neutral detergent fiber (NDF), acid detergent fiber (ADF) and neutral detergent insoluble protein (NDICP), respectively (P>0.05). No matter where from Dangxiong or Naqu, compared with cold-season pasture, warm-season pasture had higher contents of DM, CP, Ash and NDICP (P<0.05), but had lower contents of CF, NDF and ADF, indicating that the nutritive value of warm-season pasture was higher than that of cold-season pasture. The productions of hay, organic matter (OM), CP, total digestible nutrient (TDN) and metabolizable energy (ME) of warm-season pasture were 629.7 kg, 519.9 kg, 111.9 kg, 354.1 kg and 5 666.4 MJ per hectare, respectively, and the corresponding parameters of cold-season pasture were 3 001.6 kg, 2 547.9 kg, 432.9 kg, 1 709.3 kg and 25 542.0 MJ per hectare, respectively. The annual productions of hay, OM, CP, TDN and ME in whole Tibetan rangelands were estimated to be 18.999 million tons, 15.915 million tons, 3.047 million tons, 10.754 million tons and 166.15 billion MJ based on nutrient productions per hectare and whole rangeland size of Tibet, respectively. Total available pasture production can meet the annual consumption for 28.147 million sheep units.
ZHAO Yuchen
,
MENG Qingxiang
,
CAN Muyou
,
CHAI Shatuo
,
REN Liping
,
ZHOU Zhenming
. Estimation of Nutritive Values and Nutrient Supply of Cold- and Warm-Season Pastures from High-Cold Steppes of Tibet Region[J]. Chinese Journal of Animal Nutrition, 2012
, 24(12)
: 2515
-2522
.
DOI: 10.3969/j.issn.1006-267x.2012.12.028
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