Evaluation Of Origin And Impurity Content On Nutritional Value Of Leylus Chinensis

Leymus chinensis （Aneurolepidium chinense）is a kind of grass, mainly distributed in Songnen plain and thenortheast of Inner Mongolia. It has high economic and ecological values and is the only forage grass earning foreignexchange through exports in northeastern China. Compared with grass level evaluation system abroad, China dose nothave perfect leymus chinensis quality grade evalution standard now. The quality standard of leymus chinensis iscurrently determined by contents of crude protein(CP). However, factors such as origin and impurity content are notincluded in the standard. With the absence of uniform standards, leymus chinensis cannot be traded by quality. Theaim of this experiment was to provide data support and reference for evaluation standard and transaction of leymuschinensis. Wild leymus chinensis and main weeds in pastures of Zhaodong, Anda, Daqing and Qiqihar were collectedaccording to the map on the meadow steppe of Heilongjiang province. The vegetation was divided into edible and nofeeding weeds, and the impurity gradients were set0%,10%,30%and10%. The results are as follows:In experiment one, the influence of origins and impurity content of leymus chinensis on nutrient values weredetermined.CP contents of leymus chinensis in different regions were significantly different (P <0.05), and L. chinensis inAnda area contain the highest CP. Neutral detergent fiber (NDF) content of leymus chinensis in daqing wassignificantly lower than those in other three regions (P <0.05), no significant difference were observed among otherareas (P>0.05), acid detergent fiber (ADF) contents of leymus chinensis in zhaodong were higher than those ofleymus chinensis in anda and daqing（P>0.05）. The content of CP in leymus chinensis from Da Qing wassigniicantly higher than that from the other three regions （P<0.05）. The contents of ADL, calcium (Ca) andphosphorus (P) in leymus chinensis from Zhao Dong were significanty lower than those from the other three regions（P<0.05）, and no significant difference of these nutrients was found in leymus chinensis from the other regions.The content of RFV1in leymus chinensis from Da Qing was significantly higher than that form the other three regions（P<0.05）.Significantdifferenceswereobservedinconventionalnutrientsofleymuschinensisgrowedindifferentregions, this may be due to the factors such as soil, climate, light, temperature and humidity in these areas are different.The species of weed in different chinense grasslands are different. Nutrients of leymus chinensis from differentregions that contain different proportions of weeds were detected. The results showed that CP, total energy, and Cacontents and RFV1were significantly reduced (P<0.05), however, ether extract (EE), NDF and ADF tend to beincreased and RFV1tend to be reduced as the additive proportions of calamagrostis rised in ZhaoDong region. Thecontents of dry matter (DM), CP and RFV were significantly reduced (P<0.05), but the contents of NDF, lignin (ADL)and P were significantly increased (P<0.05) as the added proportions of water artemisia rised in An Da regions. DM,Ash and Ca contents of samples contained50%weed significantly reduced (P<0.05), while CP, total energy, andNDF contents of these samples significantly were increased (P<0.05), as the added proportions of puccinelliatenuiflora rised in Da Qing regions.The contents of CP and Ash were significantly increased (P<0.05), and NDF were significantly reduced (P<0.05), and EE and total energy tended to be reduced. All in all, significant differences wereobserved in conventional nutrients of leymus chinensis growed in different special of weeds.In experiment two, the influences of origins and impurity content of leymus chinensis on remen degradationwere determined.The effect of origin on rumen degradation. DM degradation rate of leymus chinense from ZhaoDong wassignificantly higher than other three regions after48h cultivation in rumen (P<0.05), and a part content of rapiddegradation and ED-value of effective degradation rate were the highest. CP degradation rate of samples from An Daregion degradation rate was the highest (P<0.05), and the following regions were Da Qing, Zhao Dong and QiqiHaer. A part content of rapid degradation of leymus chinense from Da Qing and b-part content of slow degradationfrom An Da region were the highest. ED-value of samples from An Da and Da Qing were significantly higher thanthat of Zhao Dong and Qiqi Haer (P<0.05). Degradation rate of NDF and ADF of samples from Qiqi Haer were thehighest, and those of An Da were the lowest. The samples with highest NDF a part content part of rapid degradationand b part of low degradation were respectively from Zhao Dong and Da Qing(P<0.05), and NDF and ADF withhighest effective degradation rate were respectively Zhao Dong and Da Qing.As the added proportions of weed increased in ZhaoDong and An Da, the rumen degradation rate of mainnutritional compositions including DM, CP, NDF and ADF were reduced, but the b part content of low degradationand ED part content part of effective degradation rate were significantly reduced (P<0.05). As the proportions of weedincreased in Da Qing and Qiqi Haer regions, DM degradation rate was significantly reduced, but no difference in CPdegradation rate were observed. NDF and ADF degradation rate of samples from Da Qing and Qiqi Haer regionstended to be reduced, and DM and CP ED part content of samples from these two regions were significantly reduced.In experiment three, the influences of origin and impurity content of leymus chinensis on.small intestinal digestionwere determined.Significant differences of DM and CP digestion of leymus chinensis in small intestine were found amongdifferent origins (P<0.05). DM small intestine digestion of leymus chinense from Qiqihaer region was the highest(P<0.05). CP small intestine digestion of leymus chinense from Zhaodong was the highest (P<0.05). After addedproportion of weeds were increased in different areas, there were significant differences on DM and CP small intestinedigestion between Zhaodong and Anda (P<0.05). There was no significant difference in DM disappearance rate bothin Daqing and Qiqihar(P>0.05), however, CP small intestine digestion was significantly increased (P <0.05) both inDaqing and Qiqihar.Conclusion, nutrients, rumen degradation characteristics and the small intestine disappeared rate of leymuschinensis were affected by origins and impurity content.