References
- AOAC . 1990 . Official Methods of Analysis. , 15th ed , 69 – 90 . Arlington, VA : Association of Official Analytical Chemists .
- Feng , Z C and Gao , M . 1993 . The improved method in determining the ammonia-N in rumen fluid by colorimetry . Inner Mongolia Anim Sci , 14 ( 4 ) : 40 – 41 .
- Hristov , N A , McAllister , T A , Van Herk , F H , Cheng , K-J , Newbold , C J and Cheeke , P R . 1999 . Effect of Yucca schidigera on ruminal fermentation and nutrient digestion in heifers . J Anim Sci , 77 : 2554 – 2563 .
- Hu , W L , Liu , J X , Ye , J A , Wu , Y M and Guo , Y Q . 2005 . Effect of tea saponin on rumen fermentation in vitro . Anim Feed Sci Technol , 120 : 333 – 339 .
- Hu , W L , Lv , J M , Zhai , S W and Liu , J X . 2004 . Effect of ciliates to methanogens and methane production in rumen . Chin J Anim Sci , 40 ( 12 ) : 39 – 42 .
- Johnson , K A and Johnson , D E . 1995 . Methane emissions from cattle . J Anim Sci , 73 : 2483 – 2492 .
- Jouany , J P . 1996 . Effect of rumen protozoa on nitrogen utilization by ruminants . J Nutr , 126 : 1335 – 1346 .
- Klita , P T , Mathison , G W , Fenton , T W and Hardin , R T . 1996 . Effects of alfalfa root saponins on digestive function in sheep . J Anim Sci , 74 : 1144 – 1156 .
- Kil , J Y , Cho , N K , Kim , B S , Lee , S R and Maeng , W J . 1994 . Effects of yucca extract addition on the in vitro fermentation characteristics of feed and feces, and on the milk yield in lactating cows . Korean J Anim Sci , 36 : 698 – 709 .
- Liu , J X , Yuan , W Z , Ye , J A and Wu , Y M . 2003 . Effect of tea (Camellia Sines) saponin addition on rumen fermentation in vitro . Trop Subtrop Agroecosys , 3 : 561 – 564 .
- Lu , C D and Jorgensen , N A . 1987 . Alfalfa saponins affect site and extent of nutrient digestion in ruminants . J Nutr , 117 : 919 – 927 .
- Lu , Y , Umeda , T , Yagi , A , Sakata , K , Chaudhuri , T , Ganguly , D K and Sarma , S . 2000 . Triterpenoid saponins from the roots of tea plant (Camellia sinensis var. assamica) . Phytochem , 53 : 941 – 946 .
- Makkar , H PS and Becker , K . 1997 . Degradation of Quillaja saponins by mixed culture of rumen microbes . Lett Appl Microbiol , 25 : 243 – 245 .
- Makkar , H PS and Becker , K . 1999 . Purine quantification in digesta from ruminants by spectrophotometric and HPLC methods . Br J Nutr , 81 : 107 – 113 .
- Mauricio , R M , Mould , F L , Dhano , M S , Owen , E , Channa , K S and Theodorou , M K . 1999 . A semi-automated in vitro gas production technique for ruminant feedstuff evaluation . Anim Feed Sci Technol , 79 : 321 – 330 .
- Menke , K H and Steingass , H . 1988 . Estimation of the energetic feed value obtained from chemical analysis and in vitro gas production using rumen fluid . Anim Res Dev , 28 : 7 – 55 .
- Ogimoto , K and Imai , S . 1981 . Atlas of rumen microbiology , 311 Tokyo : Japan Scientific Society Press .
- SAS . 1997 . SAS User's Guide: Statistics (version 6.12) , Cary, NC, , USA : SAS Inst. Inc. .
- Sen , S , Makkar , H PS , Muetzel , S and Becker , K . 1998 . Effect of Quillaja saponiria and Yucca schidigera plant extract on growth of Escherichia coli . Lett Appl Microbiol , 27 : 35 – 38 .
- Theodorou , M K , Williams , B A , Dhanoa , M S , McAllan , A B and France , J . 1994 . A simple gas production method using a pressure transducer to determine the fermentation kinetics of ruminant feeds . Anim Feed Sci Technol , 48 : 185 – 197 .
- Van Soest , P J , Robertson , J B and Lowis , B A . 1991 . Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrion . J Dairy Sci , 74 : 3583 – 3597 .
- Wang , Y X , McAllister , T A , Newbold , C J , Cheeke , P R and Cheng , K J . 1997 . Effects of Yucca extract on fermentation and degradation of saponins in the Rusitec . Proc Western Section Am Soc Anim Sci , 48 : 149 – 152 .
- Wang , Y X , McAllister , T A , Yanke , L J , Xu Zh , J , Cheeke , P R and Cheng , K-J . 2000 . In vitro effects of steroidal saponins from Yucca Schidigere extract on rumen microbial protein synthesis and ruminal fermentation . J Sci Food Agri , 80 : 2114 – 2122 .
- Williams , A G and Coleman , G S . 1991 . The rumen protozoa , New York : Springer-Verlag New York Inc. .
- Wilson , R C , Overton , T R and Clark , J H . 1998 . Effects of Yucca schidigere extract and soluble protein on performance of cows and concentrations of urea nitrogen in plasma and milk . J Dairy Sci , 81 : 1022 – 1027 .
- Wu , Z , Sadik , M , Sleiman , F T , Simas , J M , Pessarakli , M and Huber , J T . 1994 . Influence of Yucca extract on ruminal metabolism in cows . J Anim Sci , 72 : 1038 – 1042 .
- Zinn , R A and Owens , F N . 1986 . A rapid procedure for purine measurement and its use for estimating net ruminal protein synthesis . Can J Anim Sci , 66 : 157 – 166 .