References

Broderick, G.A. and J.H. Kang, 1980. Automated simultaneous determination of ammonia and total amino acids in ruminal fluid and in vitro media. J. Dairy Sci., 63: 64-75.
CrossRef  |  Direct Link  |  

Ellenberger, M.A., W.V. Rumpler, D.E. Johnson and S.R. Goodall, 1985. Evaluation of the extent of ruminal urease inhibition by sarsaponin and sarsaponin fractions. J. Anim. Sci., 61: 491-491.

Finlay, B.J., G. Esteban, K.J. Clarke, A.G. Williams, T.M. Embley and R.P. Hirt, 1994. Some rumen ciliates have endosymbiotic methanogens. FEMS Microbiol. Lett., 117: 157-161.
CrossRef  |  

Guo, Y.Q., J.X. Liu, Y. Lu, W.Y. Zhu, S.E. Denman and C.S. McSweeney, 2008. Effect of tea saponin on methanogenesis, microbial community structure and expression of mcrA gene, in cultures of rumen micro-organisms. Lett. Appl. Microbiol., 47: 421-426.
CrossRef  |  PubMed  |  Direct Link  |  

Hristov, A.N., T.A. McAllister, F.H. van Herk, K.J. Cheng, C.J. Newbold and P.R. Cheeke, 1999. Effect of yucca schidigera on ruminal fermentation and nutrient digestion in heifers. J. Anim. Sci., 77: 2554-2563.
Direct Link  |  

Hu, W.L., J.X. Liu, J.A. Ye, Y.M. Wu and Y.Q. Guo, 2005. Effect of tea saponin on rumen fermentation In vitro. Anim. Feed Sci. Technol., 120: 333-339.
CrossRef  |  Direct Link  |  

Klita, P.T., G.W. Mathison, T.W. Fenton and R.T. Hardin, 1996. Effects of alfalfa root saponins on digestive function in sheep. J. Anim. Sci., 74: 1144-1156.
PubMed  |  Direct Link  |  

Kostova, I. and D. Dinchev, 2005. Saponins in Tribulus terrestris-chemistry and bioactivity. Phytochem. Rev., 4: 111-137.
CrossRef  |  Direct Link  |  

Lila, Z.A., N. Mohammed, S. Kanda, T. Kamada and H. Itabashi, 2003. Effect of sarsaponin on ruminal fermentation with particular reference to methane production in vitro. J. Dairy Sci., 86: 3330-3336.
CrossRef  |  PubMed  |  Direct Link  |  

Makkar, H.P. and K. Becker, 1996. Effect of Quillaja saponins on in vitro rumen fermentation. Adv. Exp. Med. Biol., 405: 387-394.
PubMed  |  

Menke, K.H. and H. Steingass, 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.
Direct Link  |  

Mirzaei-Aghsaghali, A. and N. Maheri-Sis, 2011. Factors affecting mitigation of methane emission from ruminants I: Feeding strategies. Asian J. Anim. Vet. Adv., 6: 888-908.
CrossRef  |  

Moss, A.R., 1993. Methane: Global warming and production by animals.. Chalcombe Publications, Kingston, UK., Pages: 105.

Newbold, C.J., B. Lassalas and J.P. Jouany, 1995. The importance of methanogens associated with ciliate protozoa in ruminal methane production in vitro. Lett. Applied Microbiol., 21: 230-234.
CrossRef  |  Direct Link  |  

Neychev, V.K., E. Nikolova, N. Zhelev and V.I. Mitev, 2007. Saponins from Tribulus terrestris L. are less toxic for normal human fibroblasts than for many cancer lines: Influence on apoptosis and proliferation. Exp. Biol. Med. (Maywood), 232: 126-133.
PubMed  |  Direct Link  |  

Ogimoto, K. and S. Imai, 1981. Atlas of Rumen Microbiology. Japan Scientific Societies Press, Tokyo, ISBN: 9784762202643, Pages: 231.

Ojha, S.K., M. Nandave, S. Arora, R. Narang, A.K. Dinda and D.S. Arya, 2008. Chronic administration of Tribulus terrestris Linn. extract improves cardiac function and attenuates myocardial infarction in rats. Int. J. Pharmacol., 4: 1-10.
CrossRef  |  Direct Link  |  

Pen, B., C. Sar, B. Mwenya, M. Kuwaki, R. Morikawa and J. Takahashi, 2006. Effects of Yucca schidigera and Quillaja saponaria extracts on In vitro ruminal fermentation and methane emission. Anim. Feed Sci. Technol., 129: 175-186.
Direct Link  |  

SAS Institute, 2002. SAS/STAT users guide, version 9.1.3 Service Pack 4. SAS Institute Inc., Cary, NC, USA.

Sebata, A., N.T. Ngongoni, J.F. Mupangwa, I.W. Nyakudya and J.S. Dube, 2005. Chemical composition and degradation characteristics of puncture vine (Tribulus terrestris). Trop. Subtrop. Agroecosys., 5: 85-89.
Direct Link  |  

Sharp, R., C.J. Ziemer, M.D. Stern and D.A. Stahl, 1998. Taxon-specific associations between protozoal and methanogen populations in the rumen and a model rumen system. FEMS Microbiol. Ecol., 26: 71-78.
CrossRef  |  

Steel, R.G.D. and J.H. Torrie, 1980. Principles and Procedures of Statistics: A Biological Approach. 2nd Edn., McGraw Hill Book Co. Inc., New York, USA.

Stumm, C.K. and K.B. Zwart, 1986. Symbiosis of protozoa with hydrogen utilizing methanogens. Microbiol. Sci., 3: 100-105.
PubMed  |  

Takahashi, J., 2011. some prophylactic options to mitigate methane emission from animal agriculture in Japan. Asian-Aust. J. Anim. Sci., 24: 285-294.
Direct Link  |  

Van Nevel, C.J. and D.I. Demeyer, 1996. Control of rumen methanogenesis. Environ. Monitor. Assess., 42: 73-97.
CrossRef  |  

Wallace, R.J., L. Arthaud and C.J. Newbold, 1994. Influence of Yucca schidigera extract on ruminal ammonia concentrations and ruminal microorganisms. Applied Environ. Microbiol., 60: 1762-1767.
Direct Link  |  

Wang, Y., T.A. McAllister, C.J. Newbold, L.M. Rode, P.R. Cheeke and K.J. Cheng, 1998. Effects of Yucca schidigera extracts on fermentation and degradation of steroidal saponins in the rumen simulation technique (RUSITEC). Anim. Feed Sci. Technol., 74: 143-153.
Direct Link  |  

Wang, Y., T.A. McAllister, L.J. Yanke and P.R. Cheeke, 2000. Effect of steroidal saponin from Yucca schidigera extract on ruminal microbes. J. Applied Microbiol., 88: 887-896.
PubMed  |  

Williams, A.G. and G.S. Coleman, 1991. The Rumen Protozoa. Springer-Verlag Inc., New York, USA., pp: 441.

Williams, A.G. and G.S. Coleman, 1997. The Rumen Protozoa. In: The Rumen Microbial Ecosystem, Hobson, P.N. and C.S. Stewart (Eds.). Blackie Academic, London, UK., pp: 73-139.

Yurtseven, S. and I. Ozturk, 2009. Influence of two sources of cereals (corn or barley), in free choice feeding on diet selection, milk production indices and gaseous products (CH₄ and CO₂) in lactating sheep. Asian J. Anim. Vet. Adv., 4: 76-85.
CrossRef  |  Direct Link  |  

Yurtseven, S., M. Cetin, I. Ozturk, A. Can, M. Boga, T. Sahin and H. Turkoglu, 2009. Effect of different feeding method on methane and carbon dioxide emissions milk yield and composition of lactating awassi sheep. Asian J. Anim. Vet. Adv., 4: 278-287.
CrossRef  |  Direct Link  |