After the Feed Has Been Rechewed and Swallowed Again

Hoofed herbivorous grazing or browsing mammals

Ruminants Temporal range: Early Eocene - present PreꞒ Ꞓ O S D C P T J K Pg North
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Clade:	Cetruminantia
Clade:	Ruminantiamorpha Spaulding et al., 2009
Suborder:	Ruminantia Scopoli, 1777
Infraorders
Tragulina (paraphyletic)[i] Pecora

Ruminants (suborder Ruminantia) are large hoofed herbivorous grazing or browsing mammals that are able to acquire nutrients from plant-based food by fermenting it in a specialized stomach prior to digestion, principally through microbial deportment. The process, which takes place in the front part of the digestive system and therefore is called foregut fermentation, typically requires the fermented ingesta (known as cud) to be regurgitated and chewed again. The process of rechewing the cud to farther break down plant thing and stimulate digestion is called rumination.^{[ii] [3]} The word "ruminant" comes from the Latin ruminare, which means "to chew over again".

The roughly 200 species of ruminants include both domestic and wild species.^[4] Ruminating mammals include cattle, all domesticated and wild bovines, goats, sheep, giraffes, deer, gazelles, and antelopes.^[five] It has as well been suggested that notoungulates likewise relied on rumination, as opposed to other atlantogenates that rely on the more than typical hindgut fermentation, though this is non entirely certain.^{[half dozen]}

Taxonomically, the suborder Ruminantia is a lineage of herbivorous artiodactyls that includes the virtually avant-garde and widespread of the world's ungulates.^[seven] The suborder Ruminantia includes six dissimilar families: Tragulidae, Giraffidae, Antilocapridae, Moschidae, Cervidae, and Bovidae.^[4]

Taxonomy and evolution [edit]

An impala swallowing and then regurgitating food – a behaviour known as "chewing the cud"

Hofmann and Stewart divided ruminants into three major categories based on their feed type and feeding habits: concentrate selectors, intermediate types, and grass/roughage eaters, with the supposition that feeding habits in ruminants cause morphological differences in their digestive systems, including salivary glands, rumen size, and rumen papillae.^{[8] [9]} Yet, Woodall institute that in that location is little correlation betwixt the fiber content of a ruminant'southward diet and morphological characteristics, significant that the categorical divisions of ruminants by Hofmann and Stewart warrant further research.^[10]

Too, some mammals are pseudoruminants, which take a three-compartment tummy instead of four like ruminants. The Hippopotamidae (comprising hippopotami) are well-known examples. Pseudoruminants, like traditional ruminants, are foregut fermentors and virtually ruminate or chew cud. However, their anatomy and method of digestion differs significantly from that of a 4-chambered ruminant.^[five]

Monogastric herbivores, such equally rhinoceroses, horses, and rabbits, are not ruminants, equally they take a elementary single-chambered breadbasket. These hindgut fermenters digest cellulose in an enlarged cecum. In smaller hindgut fermenters of the order Lagomorpha (rabbits, hares, and pikas), cecotropes formed in the cecum are passed through the big intestine and subsequently reingested to allow another opportunity to absorb nutrients.

Phylogeny [edit]

Ruminantia is a crown grouping of ruminants within the society Artiodactyla, cladistically divers by Spaulding et al. equally "the least inclusive clade that includes Bos taurus (cow) and Tragulus napu (mouse deer)". Ruminantiamorpha is a higher-level clade of artiodactyls, cladistically defined past Spaulding et al. every bit "Ruminantia plus all extinct taxa more than closely related to extant members of Ruminantia than to any other living species."^[11] This is a stem-based definition for Ruminantiamorpha, and is more inclusive than the crown group Ruminantia. Every bit a crown group, Ruminantia only includes the concluding mutual ancestor of all extant (living) ruminants and their descendants (living or extinct), whereas Ruminantiamorpha, every bit a stem group, also includes more basal extinct ruminant ancestors that are more closely related to living ruminants than to other members of Artiodactyla. When considering only living taxons (neontology), this makes Ruminantiamorpha and Ruminantia synonymous, and merely Ruminantia is used. Thus, Ruminantiamorpha is only used in the context of paleontology. Appropriately, Spaulding grouped some genera of the extinct family Anthracotheriidae inside Ruminantiamorpha (but not in Ruminantia), simply placed others within Ruminantiamorpha'south sister clade, Cetancodontamorpha.^[11]

Ruminantia's placement within Artiodactyla tin be represented in the following cladogram:^{[12] [13] [14] [15] [16]}

Inside Ruminantia, the Tragulidae (mouse deer) are considered the about basal family,^[17] with the remaining ruminants classified as belonging to the infraorder Pecora. Until the beginning of the 21st century information technology was understood that the family Moschidae (musk deer) was sis to Cervidae. All the same, a 2003 phylogenetic written report past Alexandre Hassanin (of National Museum of Natural History, France) and colleagues, based on mitochondrial and nuclear analyses, revealed that Moschidae and Bovidae course a clade sister to Cervidae. Co-ordinate to the written report, Cervidae diverged from the Bovidae-Moschidae clade 27 to 28 million years ago.^[18] The following cladogram is based on a very recent big-scale genome ruminant genome sequence written report in 2019:^[19]

Classification [edit]

• ORDER ARTIODACTYLA
  • Suborder Tylopoda: camels and llamas, 7 living species in three genera
  • Suborder Suina: pigs and peccaries
  • Suborder Cetruminantia: ruminants, whales and hippos
    • unranked Ruminantia
      • Infraorder Tragulina (paraphyletic)^[one]
        • Family †Prodremotheriidae
        • Family unit †Hypertragulidae
        • Family unit †Praetragulidae
        • Family unit †Protoceratidae^[11]
        • Family Tragulidae: chevrotains, half dozen living species in 4 genera
        • Family †Archaeomerycidae
        • Family †Lophiomerycidae
      • Infraorder Pecora
        • Family unit Cervidae: deer and moose, 49 living species in 16 genera
        • Family unit †Gelocidae
        • Family †Palaeomerycidae
        • Family †Hoplitomerycidae
        • Family †Climacoceratidae
        • Family Giraffidae: giraffe and okapi, 2 living species in 2 genera
        • Family Antilocapridae: pronghorn, one living species in ane genus
        • Family †Leptomerycidae^[11]
        • Family Moschidae: musk deer, 4 living species in one genus
        • Family Bovidae: cattle, goats, sheep, and antelope, 143 living species in 53 genera

Digestive organization of ruminants [edit]

Stylised illustration of a ruminant digestive organisation

Different forms of the tum in mammals. A, dog; B, Mus decumanus; C, Mus musculus; D, weasel; E, scheme of the ruminant breadbasket, the pointer with the dotted line showing the course taken by the food; F, human being breadbasket. a, modest curvature; b, major curvature; c, cardiac stop Chiliad, camel; H, Echidna aculeata. Cma, major curvature; Cmi, minor curvature. I, Bradypus tridactylus Du, duodenum; MB, coecal diverticulum; **, outgrowths of duodenum; †, reticulum; ††, rumen. A (in East and Thou), abomasum; Ca, cardiac division; O, psalterium; Oe, oesophagus; P, pylorus; R (to the correct in E and to the left in Grand), rumen; R (to the left in E and to the right in One thousand), reticulum; Sc, cardiac division; Sp, pyloric division; WZ, h2o-cells. (from Wiedersheim'south Comparative Anatomy)

Food digestion in the simple tum of nonruminant animals versus ruminants^[20]

The primary difference betwixt ruminants and nonruminants is that ruminants' stomachs take four compartments:

1. rumen—primary site of microbial fermentation
2. reticulum
3. omasum—receives chewed cud, and absorbs volatile fatty acids
4. abomasum—true stomach

The kickoff two chambers are the rumen and the reticulum. These two compartments make upward the fermentation vat and are the major site of microbial activeness. Fermentation is crucial to digestion considering it breaks down complex carbohydrates, such as cellulose, and enables the animal to use them. Microbes part all-time in a warm, moist, anaerobic environment with a temperature range of 37.vii to 42.ii °C (100 to 108 °F) and a pH between 6.0 and 6.4. Without the assistance of microbes, ruminants would non be able to employ nutrients from forages.^[21] The nutrient is mixed with saliva and separates into layers of solid and liquid material.^[22] Solids clump together to form the cud or bolus.

The cud is then regurgitated and chewed to completely mix it with saliva and to break down the particle size. Smaller particle size allows for increased nutrient absorption. Fiber, especially cellulose and hemicellulose, is primarily broken down in these chambers by microbes (by and large bacteria, every bit well as some protozoa, fungi, and yeast) into the iii volatile fatty acids (VFAs): acetic acid, propionic acid, and butyric acid. Protein and nonstructural carbohydrate (pectin, sugars, and starches) are also fermented. Saliva is very important because it provides liquid for the microbial population, recirculates nitrogen and minerals, and acts as a buffer for the rumen pH.^[21] The type of feed the animal consumes affects the corporeality of saliva that is produced.

Though the rumen and reticulum take different names, they take very similar tissue layers and textures, making it difficult to visually separate them. They also perform similar tasks. Together, these chambers are called the reticulorumen. The degraded digesta, which is now in the lower liquid part of the reticulorumen, then passes into the next chamber, the omasum. This chamber controls what is able to laissez passer into the abomasum. It keeps the particle size every bit pocket-size equally possible in order to pass into the abomasum. The omasum likewise absorbs volatile fatty acids and ammonia.^[21]

After this, the digesta is moved to the truthful stomach, the abomasum. This is the gastric compartment of the ruminant tummy. The abomasum is the straight equivalent of the monogastric tummy, and digesta is digested here in much the same way. This compartment releases acids and enzymes that farther assimilate the material passing through. This is too where the ruminant digests the microbes produced in the rumen.^[21] Digesta is finally moved into the small intestine, where the digestion and assimilation of nutrients occurs. The small intestine is the main site of nutrient absorption. The surface area of the digesta is greatly increased here considering of the villi that are in the small intestine. This increased expanse allows for greater food absorption. Microbes produced in the reticulorumen are likewise digested in the modest intestine. Afterwards the small intestine is the large intestine. The major roles here are breaking downward mainly fiber by fermentation with microbes, assimilation of water (ions and minerals) and other fermented products, and besides expelling waste.^[23] Fermentation continues in the large intestine in the same fashion as in the reticulorumen.

Just small amounts of glucose are absorbed from dietary carbohydrates. Nigh dietary carbohydrates are fermented into VFAs in the rumen. The glucose needed as energy for the encephalon and for lactose and milk fat in milk production, equally well every bit other uses, comes from nonsugar sources, such as the VFA propionate, glycerol, lactate, and protein. The VFA propionate is used for around seventy% of the glucose and glycogen produced and protein for some other 20% (50% nether starvation weather).^{[24] [25]}

Abundance, distribution, and domestication [edit]

Wild ruminants number at least 75 million^[26] and are native to all continents except Antarctica and Australia.^[4] Nearly 90% of all species are institute in Eurasia and Africa.^[26] Species inhabit a wide range of climates (from tropic to arctic) and habitats (from open plains to forests).^[26]

The population of domestic ruminants is greater than three.5 billion, with cattle, sheep, and goats bookkeeping for about 95% of the total population. Goats were domesticated in the About Due east circa 8000 BC. Most other species were domesticated past 2500 BC., either in the Nigh East or southern asia.^[26]

Ruminant physiology [edit]

Ruminating animals take various physiological features that enable them to survive in nature. One feature of ruminants is their continuously growing teeth. During grazing, the silica content in provender causes abrasion of the teeth. This is compensated for by continuous tooth growth throughout the ruminant's life, equally opposed to humans or other nonruminants, whose teeth cease growing after a particular age. Most ruminants do not have upper incisors; instead, they have a thick dental pad to thoroughly chew plant-based food.^[27] Some other feature of ruminants is the big ruminal storage capacity that gives them the ability to swallow feed rapidly and complete the chewing process subsequently. This is known as rumination, which consists of the regurgitation of feed, rechewing, resalivation, and reswallowing. Rumination reduces particle size, which enhances microbial role and allows the digesta to pass more hands through the digestive tract.^[21]

Rumen microbiology [edit]

Vertebrates lack the ability to hydrolyse the beta [ane–four] glycosidic bail of plant cellulose due to the lack of the enzyme cellulase. Thus, ruminants completely depend on the microbial flora, present in the rumen or hindgut, to assimilate cellulose. Digestion of nutrient in the rumen is primarily carried out past the rumen microflora, which contains dumbo populations of several species of bacteria, protozoa, sometimes yeasts and other fungi – one ml of rumen is estimated to contain x–l billion bacteria and i 1000000 protozoa, besides equally several yeasts and fungi.^[28]

Since the surround inside a rumen is anaerobic, most of these microbial species are obligate or facultative anaerobes that can decompose complex constitute material, such every bit cellulose, hemicellulose, starch, and proteins. The hydrolysis of cellulose results in sugars, which are further fermented to acetate, lactate, propionate, butyrate, carbon dioxide, and methane.

As bacteria conduct fermentation in the rumen, they consume about 10% of the carbon, 60% of the phosphorus, and 80% of the nitrogen that the ruminant ingests.^[29] To reclaim these nutrients, the ruminant then digests the leaner in the abomasum. The enzyme lysozyme has adapted to facilitate digestion of bacteria in the ruminant abomasum.^[xxx] Pancreatic ribonuclease also degrades bacterial RNA in the ruminant modest intestine as a source of nitrogen.^[31]

During grazing, ruminants produce large amounts of saliva – estimates range from 100 to 150 litres of saliva per mean solar day for a cow.^[32] The role of saliva is to provide ample fluid for rumen fermentation and to act every bit a buffering amanuensis.^[33] Rumen fermentation produces big amounts of organic acids, thus maintaining the advisable pH of rumen fluids is a disquisitional factor in rumen fermentation. Later on digesta passes through the rumen, the omasum absorbs excess fluid so that digestive enzymes and acid in the abomasum are not diluted.^[1]

Tannin toxicity in ruminant animals [edit]

Tannins are phenolic compounds that are usually found in plants. Constitute in the foliage, bud, seed, root, and stem tissues, tannins are widely distributed in many different species of plants. Tannins are separated into two classes: hydrolysable tannins and condensed tannins. Depending on their concentration and nature, either class can take adverse or beneficial furnishings. Tannins can be beneficial, having been shown to increase milk product, wool growth, ovulation rate, and lambing percentage, also equally reducing bloat hazard and reducing internal parasite burdens.^[34]

Tannins can be toxic to ruminants, in that they precipitate proteins, making them unavailable for digestion, and they inhibit the absorption of nutrients by reducing the populations of proteolytic rumen bacteria.^{[34] [35]} Very high levels of tannin intake tin produce toxicity that can even crusade death.^[36] Animals that normally eat tannin-rich plants can develop defensive mechanisms against tannins, such as the strategic deployment of lipids and extracellular polysaccharides that have a loftier analogousness to binding to tannins.^[34] Some ruminants (goats, deer, elk, moose) are able to swallow nutrient high in tannins (leaves, twigs, bark) due to the presence in their saliva of tannin-bounden proteins.^[37]

Religious importance [edit]

The Police of Moses in the Bible immune the eating of some mammals that had cloven hooves (i.e. members of the gild Artiodactyla) and "that chew the cud",^[38] a stipulation preserved to this day in Jewish dietary laws.

Other uses [edit]

The verb 'to ruminate' has been extended metaphorically to mean to ponder thoughtfully or to meditate on some topic. Similarly, ideas may exist 'chewed on' or 'digested'. 'Chew the (ane'due south) cud' is to reflect or meditate. In psychology, "rumination" refers to a pattern of thinking, and is unrelated to digestive physiology.

Ruminants and climate change [edit]

Methane is produced by a type of archaea, called methanogens, as described above inside the rumen, and this methane is released to the atmosphere. The rumen is the major site of methane production in ruminants.^[39] Methane is a strong greenhouse gas with a global warming potential of 86 compared to CO₂ over a xx-yr flow.^{[forty] [41] [42]}

In 2010, enteric fermentation accounted for 43% of the total greenhouse gas emissions from all agronomical activeness in the world,^[43] 26% of the total greenhouse gas emissions from agricultural activity in the U.Southward., and 22% of the total U.Southward. methane emissions.^[44] The meat from domestically raised ruminants has a higher carbon equivalent footprint than other meats or vegetarian sources of protein based on a global meta-analysis of lifecycle assessment studies.^[45] Methyl hydride product by meat animals, principally ruminants, is estimated 15–20% global production of methane, unless the animals were hunted in the wild.^{[46] [47]} The current U.South. domestic beef and dairy cattle population is effectually 90 1000000 head, approximately 50% higher than the peak wild population of American Bison of 60 million head in the 1700s,^[48] which primarily roamed the part of North America that now makes upwards the United States.

Encounter besides [edit]

• Monogastric
• Pseudoruminant

References [edit]

1. ^ ^{a b c} Clauss, M.; Rossner, One thousand. East. (2014). "Former world ruminant morphophysiology, life history, and fossil record: exploring key innovations of a diversification sequence" (PDF). Annales Zoologici Fennici. 51 (one–2): 80–94. doi:10.5735/086.051.0210. S2CID 85347098.
2. ^ "Rumination: The process of foregut fermentation".
3. ^ "Ruminant Digestive System" (PDF).
4. ^ ^{a b c} Fernández, Manuel Hernández; Vrba, Elisabeth S. (2005-05-01). "A complete gauge of the phylogenetic relationships in Ruminantia: a dated species-level supertree of the extant ruminants". Biological Reviews. 80 (two): 269–302. doi:x.1017/s1464793104006670. ISSN 1469-185X. PMID 15921052. S2CID 29939520.
5. ^ ^{a b} Fowler, K.E. (2010). "Medicine and Surgery of Camelids", Ames, Iowa: Wiley-Blackwell. Chapter one General Biology and Evolution addresses the fact that camelids (including camels and llamas) are not ruminants, pseudo-ruminants, or modified ruminants.
6. ^ Richard F. Kay, M. Susana Bargo, Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Germination, Cambridge University Printing, 11/ten/2012
7. ^ "Suborder Ruminatia, the Ultimate Ungulate".
8. ^ Ditchkoff, S. Due south. (2000). "A decade since "diversification of ruminants": has our knowledge improved?" (PDF). Oecologia. 125 (1): 82–84. Bibcode:2000Oecol.125...82D. doi:10.1007/PL00008894. PMID 28308225. S2CID 23923707. Archived from the original (PDF) on 2011-07-xvi.
9. ^ Reinhold R Hofmann, 1989."Evolutionary steps of ecophysiological and diversification of ruminants: a comparative view of their digestive system". Oecologia, 78:443–457
10. ^ Woodall, P. F. (1992-06-01). "An evaluation of a rapid method for estimating digestibility". African Journal of Ecology. xxx (2): 181–185. doi:10.1111/j.1365-2028.1992.tb00492.x. ISSN 1365-2028.
11. ^ ^{a b c d} Spaulding, Thousand; O'Leary, MA; Gatesy, J (2009). "Relationships of Cetacea (Artiodactyla) among mammals: increased taxon sampling alters interpretations of key fossils and graphic symbol evolution". PLOS 1. 4 (9): e7062. Bibcode:2009PLoSO...4.7062S. doi:10.1371/journal.pone.0007062. PMC2740860. PMID 19774069.
12. ^ Brook, North.R. (2006). "A higher-level MRP supertree of placental mammals". BMC Evol Biol. 6: 93. doi:10.1186/1471-2148-six-93. PMC1654192. PMID 17101039.
13. ^ O'Leary, G.A.; Bloch, J.I.; Flynn, J.J.; Gaudin, T.J.; Giallombardo, A.; Giannini, N.P.; Goldberg, Due south.L.; Kraatz, B.P.; Luo, Z.-X.; Meng, J.; Ni, X.; Novacek, K.J.; Perini, F.A.; Randall, Z.S.; Rougier, G.W.; Sargis, E.J.; Silcox, M.T.; Simmons, Due north.B.; Spaulding, G.; Velazco, P.M.; Weksler, Chiliad.; Wible, J.R.; Cirranello, A.50. (2013). "The Placental Mammal Antecedent and the Mail-Chiliad-Pg Radiation of Placentals". Science. 339 (6120): 662–667. Bibcode:2013Sci...339..662O. doi:ten.1126/science.1229237. hdl:11336/7302. PMID 23393258. S2CID 206544776.
14. ^ Song, Southward.; Liu, Fifty.; Edwards, S.Five.; Wu, S. (2012). "Resolving conflict in eutherian mammal phylogeny using phylogenomics and the multispecies coalescent model". Proceedings of the National Academy of Sciences. 109 (37): 14942–14947. Bibcode:2012PNAS..10914942S. doi:10.1073/pnas.1211733109. PMC3443116. PMID 22930817.
15. ^ dos Reis, M.; Inoue, J.; Hasegawa, M.; Asher, R.J.; Donoghue, P.C.J.; Yang, Z. (2012). "Phylogenomic datasets provide both precision and accuracy in estimating the timescale of placental mammal phylogeny". Proceedings of the Purple Order B: Biological Sciences. 279 (1742): 3491–3500. doi:10.1098/rspb.2012.0683. PMC3396900. PMID 22628470.
16. ^ Upham, N.Due south.; Esselstyn, J.A.; Jetz, W. (2019). "Inferring the mammal tree: Species-level sets of phylogenies for questions in ecology, evolution, and conservation". PLOS Biology. 17 (12): e3000494. doi:10.1371/journal.pbio.3000494. PMC6892540. PMID 31800571. (see due east.chiliad. Fig S10)
17. ^ Kulemzina, Anastasia I.; Yang, Fengtang; Trifonov, Vladimir A.; Ryder, Oliver A.; Ferguson-Smith, Malcolm A.; Graphodatsky, Alexander S. (2011). "Chromosome painting in Tragulidae facilitates the reconstruction of Ruminantia bequeathed karyotype". Chromosome Research. xix (four): 531–539. doi:10.1007/s10577-011-9201-z. ISSN 0967-3849. PMID 21445689. S2CID 8456507.
18. ^ Hassanin, A.; Douzery, Eastward. J. P. (2003). "Molecular and morphological phylogenies of Ruminantia and the culling position of the Moschidae". Systematic Biological science. 52 (2): 206–28. doi:10.1080/10635150390192726. PMID 12746147.
19. ^ Chen, L.; Qiu, Q.; Jiang, Y.; Wang, G. (2019). "Large-scale ruminant genome sequencing provides insights into their evolution and distinct traits". Science. 364 (6446): eaav6202. Bibcode:2019Sci...364.6202C. doi:10.1126/scientific discipline.aav6202. PMID 31221828.
20. ^ Russell, J. B. 2002. Rumen Microbiology and its role In Ruminant Nutrition.
21. ^ ^{a b c d eastward} Rickard, Tony (2002). Dairy Grazing Transmission. MU Extension, University of Missouri-Columbia. pp. 7–viii.
22. ^ "How do ruminants assimilate?". OpenLearn. The Open University. Retrieved 14 July 2016.
23. ^ Meyer. Grade Lecture. Brute Nutrition. Academy of Missouri-Columbia, MO. 16 September 2016
24. ^ William O. Reece (2005). Functional Anatomy and Physiology of Domestic Animals, pages 357–358 ISBN 978-0-7817-4333-4
25. ^ Colorado State University, Hypertexts for Biomedical Science: Food Absorption and Utilization in Ruminants
26. ^ ^{a b c d} Hackmann. T. J., and Spain, J. N. 2010."Ruminant ecology and evolution: Perspectives useful to livestock research and production". Journal of Dairy Science, 93:1320–1334
27. ^ "Dental Anatomy of Ruminants".
28. ^ "Fermentation Microbiology and Ecology".
29. ^ Callewaert, L.; Michiels, C. W. (2010). "Lysozymes in the animal kingdom". Periodical of Biosciences. 35 (1): 127–160. doi:ten.1007/S12038-010-0015-v. PMID 20413917. S2CID 21198203.
30. ^ Irwin, D. M.; Prager, Eastward. G.; Wilson, A. C. (1992). "Evolutionary genetics of ruminant lysozymes". Animal Genetics. 23 (iii): 193–202. doi:x.1111/j.1365-2052.1992.tb00131.x. PMID 1503255.
31. ^ Jermann, T. M.; Opitz, J. G.; Stackhouse, J.; Benner, S. A. (1995). "Reconstructing the evolutionary history of the artiodactyl ribonuclease superfamily" (PDF). Nature. 374 (6517): 57–59. Bibcode:1995Natur.374...57J. doi:10.1038/374057a0. PMID 7532788. S2CID 4315312. Archived from the original (PDF) on 2019-05-21.
32. ^ Reid, J.T.; Huffman, C.F. (1949). "Some physical and chemical properties of Bovine saliva which may affect rumen digestion and synthesis". Journal of Dairy Science. 32 (2): 123–132. doi:x.3168/jds.s0022-0302(49)92019-vi.
33. ^ "Rumen Physiology and Rumination". Archived from the original on 1998-01-29.
34. ^ ^{a b c} B.R Min, et al (2003) The consequence of condensed tannins on the diet and wellness of ruminants fed fresh temperate forages: a review Animal Feed Science and Technology 106(1):3–19
35. ^ Bate-Smith and Swain (1962). "Flavonoid compounds". In Florkin M., Stonemason H.S. (ed.). Comparative biochemistry. Vol. III. New York: Academic Press. pp. 75–809.
36. ^ "Cornell University Department of Animal Science".
37. ^ Austin, PJ; et al. (1989). "Tannin-binding proteins in saliva of deer and their absence in saliva of sheep and cattle". J Chem Ecol. fifteen (4): 1335–47. doi:10.1007/BF01014834. PMID 24272016. S2CID 32846214.
38. ^ Leviticus 11:3
39. ^ Asanuma, Narito; Iwamoto, Miwa; Hino, Tsuneo (1999). "Effect of the Addition of Fumarate on Methyl hydride Production by Ruminal Microorganisms in Vitro". Periodical of Dairy Science. 82 (4): 780–787. doi:x.3168/jds.S0022-0302(99)75296-3. PMID 10212465.
40. ^ IPCC Fifth Assessment Study, Table viii.vii, Chap. 8, pp. 8–58 (PDF)
41. ^ Shindell, D. T.; Faluvegi, G.; Koch, D. M.; Schmidt, K. A.; Unger, N.; Bauer, S. E. (2009). "Improved Attribution of Climate Forcing to Emissions". Science. 326 (5953): 716–718. Bibcode:2009Sci...326..716S. doi:10.1126/science.1174760. PMID 19900930. S2CID 30881469.
42. ^ Shindell, D. T.; Faluvegi, 1000.; Koch, D. G.; Schmidt, G. A.; Unger, N.; Bauer, Southward. E. (2009). "Improved Attribution of Climate Forcing to Emissions". Science. 326 (5953): 716–728. Bibcode:2009Sci...326..716S. doi:10.1126/science.1174760. PMID 19900930. S2CID 30881469.
43. ^ Nutrient and Agriculture System of the United Nations (2013) "FAO Statistical Yearbook 2013 World Nutrient and Agriculture". See data in Table 49 on p. 254.
44. ^ "Inventory of U.South. Greenhouse Gas Emissions and Sinks: 1990–2014". 2016.
45. ^ Ripple, William J.; Pete Smith; Helmut Haberl; Stephen A. Montzka; Clive McAlpine & Douglas H. Boucher. 2014. "Ruminants, climate change and climate policy". Nature Climate Modify. Volume 4 No. one. pp. 2–5.
46. ^ Cicerone, R. J., and R. S. Oremland. 1988 "Biogeochemical Aspects of Atmospheric Methane"
47. ^ Yavitt, J. B. 1992. Methyl hydride, biogeochemical cycle. pp. 197–207 in Encyclopedia of Earth System Science, Vol. 3. Acad.Press, London.
48. ^ Bureau of Sport Fisheries and Wildlife (January 1965). "The American Buffalo". Conservation Note. 12.

External links [edit]

• Digestive Physiology of Herbivores – Colorado State Academy (Last updated on 13 July 2006)
• Britannica, The Editors of Encyclopaedia. "Ruminant". Encyclopædia Britannica, Invalid Date, https://world wide web.britannica.com/brute/ruminant. Accessed 22 February 2021.
• "Ruminantia". Encyclopædia Britannica (11th ed.). 1911.

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