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| 1 | Rumen-protected methionine during the peripartal period in dairy cows and its effects on abundance of major species of ruminal bacteria显示文摘Background: Extensive degradation of amino acids in the rumen via microbial deamination decreases the postruminal availability of dietary indispensable amino acids. Together with the normal decrease in voluntary dry matter intake(DMI) around parturition in dairy cows, microbial metabolism contributes to a markedly negative balance of indispensable amino acids, including methionine which may be the first-limiting for milk production. The main objective of the current study was to profile changes in major bacterial species with key functions in cel ulose and hemicel ulose digestion, xylan breakdown, proteolytic action, propionic acid production, lactate utilization and ruminal biohydrogenation in cows supplemented with rumen-protected Methionine(SM; Smartamine M, Adisseo NA, Alpharetta,GA, USA) from-23 through 30 d relative to parturition. Because ~90% of the methionine in SM bypasses the rumen,~10% of the methionine is released into the rumen and can be utilized by microbes.Results: As expected, there was an increase in overall DMI after parturition(Day, P < 0.05) during which cows consumed on average 19.6 kg/d versus 13.9 kg/d in the prepartum period. The postpartum diet contained greater concentrations of lipid and highly-fermentable carbohydrate from corn grain, which likely explains the increases in the relative abundance of Anaerovibrio lipolytica, Megasphaera elsdenii, Prevotella bryantii, Selenomonas ruminantium,Streptococcus bovis, and Succinimonas amylolytica. Despite similar DMI prepartum, cows fed SM had greater(Treatment × Day, P < 0.05) abundance prepartum of Fibrobacter succinogenes, Succinimonas amylolytica, and Succinivibrio dextrinosolvens. However, the greater DMI in cows fed SM after parturition(19.6 kg/d versus 13.9 kg/d) was associated with lower abundance of Fibrobacter succinogenes(2.13 × 10-3 versus 2.25 × 10-4) and Selenomonas ruminantium(2.98 × 10-1 versus 4.10 × 10-1). A lower abundance(Day, P < 0.05) was detected on d 20 compared with d-10 for Fibrobacter succinogenes and Succinivibrio dextrinosolvens. The relative abundance of Butyrivibrio proteoclasticus and Eubacterium ruminantium was stable across treatment and time.(Continued from previous page)Conclusions: In diets with proper balance of rumen-degradable protein and fermentable carbohydrate, the smal fraction of Methionine released from the rumen-protected supplement did not seem to compromise growth of major bacterial species in the rumen. In fact, it had a positive effect on 3 major species prepartum when DMI was similar between groups. Because the actual requirements of Methionine(and Lysine, for example) by the cow during the transition period are unknown, it appears warranted to study the rumen microbiome as it relates to supply of rumen-protected amino acids. | Mohamed K.Abdelmegeid Ahmed A.Elolimy Zheng Zhou Vincenzo Lopreiato Joshua C.Mc Cann Juan J.Loor | 2018 | Journal of Animal Science and Biotechnology2018，9，2： | 7 |
| 2 | Hypothesis: Iodine, selenium and the development of breast cancer显示文摘 | Stephen A. Cann Johannes P. van Netten Christiaan van Netten | 2000 | Cancer Causes and Control2000，，2： | 3 |
| 3 | Purification and characterization of a thermostable α - galactosidase from Thermoanaerobacterium polysaccharolyticum显示文摘 | King M R White B A Blaschek H P Chassy B M Mackie R I Cann I KO | 2002 | Journal of Agricultural and Food Chemistry2002，50，： | 1 |
| 4 | Tectonic setting of basic rocks determined using trace element analysis 显示文摘 | Pearce J A and Cann J R | 1973 | Earth and Plantetary Science Letters1973，24，： | 1 |
| 5 | Central role of detachment faults in accretion of slow-spreading oceaniclithosphere 显示文摘 | Escartfn J Smith D K Cann J | 2008 | Nature2008，455，7214： | 1 |
| 6 | A correlation test of the rela- tionship between posttraumatic growth, religion, and cognitive processing显示文摘 | Calhoun LG Cann A Tedeschi RG | 2000 | J Trauma Stress2000，13，3： | 1 |
| 7 | Top Management Team Behavioral Inte- gration, Decision Quality, and Organizational Decline 显示文摘 | Canneli A Schaubroeck J | 2006 | TheLeadership Quarterly2006，17，5： | 1 |
| 8 | Finite element models predict in vitro vertebral body compressive strength better than quantitative computed tomography 显示文摘 | Crawford RP Cann CE Keaveny TM | 2003 | Bone2003，33，4： | 1 |
| 9 | The spatial and hierachical organization of Japanese and US multinational semiconductor firms显示文摘 | Arita T Mc Cann P | 2002 | Journal of Intenational Management2002，8，1： | 1 |
| 10 | Determination of the shear stress of the lubricants in elastohydrodynamic contacts显示文摘 | Cann P M Spikes H A | 1989 | STLE1989，32，3： | 1 |
| 11 | Whole rock aminostratigraphy of the Coorong Coastal Plain, South Australia towards a 1 million year record of sea-level high- stands显示文摘 | Murray-Wallace C V Brooke B P Cann J H | 2001 | Journal of the Geological Society of London2001，158，： | 1 |
| 12 | Phylogeny of Y chromosomes from bovine species 显示文摘 | NIJMAN I J VAN BOXTEL D C J VAN CANN L M | 2008 | Cladistics2008，24，5： | 1 |
| 13 | Application of a sliding-mode observer for position and speed estimation in switched reluctance motor drives显示文摘 | RoyAMc Cann Mohammad S Islam | 2001 | IEEE Transactions on Industry Applications2001，37，1： | 1 |
| 14 | Origins of photosynthesis显示文摘 | NISBET E G CANN J R VAN DOVER C L | 1995 | Nature1995，373，： | 1 |
| 15 | Universal neonatal hearing screening moving from evidence to practice显示文摘 | Kennedy C Mc Cann D | 2004 | Arch Dis Child Fetal Neonatal Ed2004，89，： | 1 |
| 16 | Grease degradation in a bearing simulation device 显示文摘 | CANN P M | 2006 | Tribology International2006，39，12： | 1 |
| 17 | Corrugated slip surfaces formed at North Atlantic ridge-transform intersections on the Mid-Atlantic Ridge显示文摘 | CANN J R SMITH D K MCALLISTER E | 1997 | Nature1997，385，23： | 1 |
| 18 | Lubricant film formation properties of alkyl imidazolium tetrafluoroborate and hexafluorophosphate ionic liquids 显示文摘 | Arora H Cann P M | 2010 | Tribology International2010，43，10： | 1 |
| 19 | Reversion to neurovirulence of the live-attenuated Sabin type 3 oral poliovirus vaccine显示文摘 | Cann AJ stanway G Hughes PJ | 1984 | Nucleic Acids Res1984，12，20： | 1 |
| 20 | Finite element models predict in vitro vertebral body compressive strength better than quantitative computed tomography显示文摘 | Crawford RP Cann CE Keaveny TM | 2003 | Bone2003，33，4： | 1 |
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