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Lecture 14 - Rumen (Grosche) Flashcards

1
Q

list animals with a ruminant digestive system that are known as ruminantia

A

cattle, sheep, goat, bison, water buffalo, yak, antelope, deer, wildebeest, nilgai, pronghorn, giraffe, etc.

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2
Q

define ruminantia

A

Ruminantia includes many of the well-known large grazing or browsing mammals: among them cattle, goats, sheep, deer, and antelope.

All members of the Ruminantia are ruminants: they digest food in two steps, chewing and swallowing in the normal way to begin with, and then regurgitating the semi-digested cud to re-chew it and thus extract the maximum possible food value.

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3
Q

define tylopods

A

an even-toed ungulate mammal of a group that comprises the camels, llamas, and their extinct relatives. They are distinguished by bearing their weight on the sole-pads of the feet rather than on the hoofs, and they do not chew the cud.

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4
Q

list animals with a ruminant digestive system that are known as tylopods

A

camel, dromedary, llama, guanaco, alpaca, vicuna

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5
Q

what is a special feature of the ruminant digestive system

A

it allows them to gain nutrition from forages (grass) and other roughages (high fiber food)

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6
Q

which animals have one stomach with 3 compartments?

A

alpacas, camels, llamas

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7
Q

what are 3 characteristics of ruminant teeth?

A
  1. no upper incisors
  2. dental pad: fibrous connective tissue with cornified epithelium
  3. mobile lower teeth
  4. canine tooth referred to as the 4th incisor
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8
Q

how many baby teeth does a ruminant typically have

A

20

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9
Q

how many permanent teeth does a ruminant typically have?

A

32

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10
Q

what are 4 characteristics of alpaca teeth?

A
  1. one upper incisor
  2. dental pad
  3. fighting teeth: modified incisor and canine teeth
  4. two fighting teeth on upper jaw and one on lower jaw
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11
Q

how many baby teeth does an alpaca have?

A

18 - 22

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12
Q

how many permanent teeth does an alpaca have?

A

28 - 32

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13
Q

what are two characteristics of a ruminant tongue?

A
  1. transverse lingual fossa

2. covered with lingual papillae (has mechanical and sensory functions)

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14
Q

4 characteristics of nasolabial glands in the ruminant

A
  1. small glands in the muzzle
  2. produce a watery secretion which keep the muzzle moist
  3. chemical properties are similar to saliva
  4. cattle mix nasolabial gland secretion with feed during chewing and lick their muzzle during rumination
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15
Q

how much mastication is done before first swallowing?

A

very little to provide significant volume of food in the rumen

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16
Q

what are some characteristics of rumination?

A
  1. regurgitation of portions of ingested food
  2. thorough mastication
  3. rumination takes up to 8 - 12 hours/day
  4. lubrication for swallowing
  5. mixing with saliva to buffer rumen
  6. exposure to digestive enzymes
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17
Q

what is the significance of spitting in camelids?

A

its a special kind of regurgitation

  • an expression of displeasure, esablishment of social order in herd, response to serious threat
  • true acid stomach content spit is highest level of serious and vile aggression with several prior behavioral warnings
  • sometimes its just air and saliva spit without prior warnings
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18
Q

what is the pH of ruminant saliva?

A

8.1 , isotonic and is 99 - 99.5% water

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19
Q

what are the anorganic components of saliva in ruminants?

A 
Na = 136-201 mEq/L
bicarb = 108
P  = 26
Cl = 14 - 15
K = 14-15
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20
Q

what are the organic components of saliva in ruminants

A

70% of dry matter

albumin, globulin, glucoprotein, mucin

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21
Q

alkaligenic glands are high in what compound? and found in which glands?

A

high in bicarb - particularly in the parotid and mandibular glands

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22
Q

mucogenic glands are high in what compound? and found in which glands?

A

mucoprotein; found in submaxillary, sublingual, labial, pharyngeal and buccal

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23
Q

which gland has continous production of alkaline saliva?

A

parotid glands

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24
Q

what are the functions of saliva?

A
  1. moistens and lubricates food, aids in bolus formation and swallowing
  2. anti-foaming properties to prevent bloating
  3. adds water and nutrients (urea, P, Mg, Cl)
  4. recycling of nitrogen via rumeno-hepatic circulation (absorption of ammonia, secretion of urea)
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25
what are some characteristics shared by the rumen, reticulum and omasum?
1. lined with non-glandular mucous membranes 2. absorption but no secretion 3. sites of anaerobic microbial fermentation
26
what are some characteristics of the abomasum?
lined with glandular mucosa secretion of digestive enzymes
27
what is the muscularture of the cardia used for?
rumiantion and formation of esophageal (reticular) groove
28
what is the function of the esophageal groove
for bypassing the rumen, reticulum and omasum in young animals
29
the rumen comprises up to how much of the stomach capacity?
80%
30
what is the principle site of microbial fermentation and absorption of short-chain volatile fatty acids (VFAs)?
the rumen
31
where are VFA's absorbed in ruminants?
through rumen papillae
32
what are 2 characteristics of rumen papillae
1. covered with stratified squamous epithelium | 2. supplied by 1 or 2 arterioles
33
how do molecules pass through rumen papillae?
molecules pass through the epithelium by diffusion, reach the venules and are transported via ruminal veins to the hepatic portal vein into the liver
34
how does the reticulum interact with the rumen
via mixing activity and forming the food bolus
35
how would you describe the reticulum?
a pouch-like structure in the forward area of the stomach
36
hardware disease
heavy or dense feed or foreign objects eaten by the animal fall into the reticulum
37
characteristics of the omasum
stratified squamous epithelium, muscular folds, highly vascularized and absorptive aids in grinding of the food 20 - 25% of the absorptive capacity of the rumen (water, VFA)
38
what cells are located in the fundic region of the abomasum
parietal cells - secrete HCl chief cells - secrete pepsin mucus secreting cells
39
what cells are located in the pyloric region of the abomasum
mucus secreting cells
40
which digestive organs grow at the fastest rates in the growing young ruminant?
the rumen, reticulum, omasum and small intestines
41
what is the primary stimulus to development of eptihelum and papillae?
the presences of VFAs
42
what substrate is available in the rumen?
hay and long fiber: development of rumen wall muscle and volume concentrates: stimulate microbial fermentation and the production of butryate and propionate; for quick development of rumen epithelium and papillae
43
what is a major function of the ruminant foregut?
physical breakdown of feed
44
physical breakdown process is continous and is composed of:
1. chewing during eating and rumination | 2. microbial fermentation
45
contractions of the reticulo-rumen are essential for:
1. mixing rumen contents 2. eructation (belching) of gasses 3. rumination
46
contractions in the reticulo-rumen can be classified as:
primary - mixing cycle secondary - eructative contractions
47
define primary reticulo-ruminal contractions and its process
definition: during a normal mixing cycle, contractions are first initiated in the reticulum and the reticulo-rumen fold process: 1. the reticulum contracts to about half of its resting size. 2. a second, more powerful contraction in the reticulum passes caudally over the rumen, resulting in a lifting of the cranial sac due to contraction of ruminal pillars and compression of the dorsal sac 3. the contraction wave continues over the caudodorsal blind sac, ventral sac and caudoventral blind sac
48
where does the secondary reticulo-ruminal contraction typically orginate
in the ventral blind sac either independently or immediately following a primary contraction
49
describe the process of the secondary reticulo-ruminal contraction
a wave of contraction passes in a circular manner to the dorsal blind sac, dorsal sac and ventral sac and back to the ventral blind sac eructation typically occurs at the end of contraction of the dorsal sac
50
list promoting factors of the reticulo-ruminal motility
- feeding (during chewing) - increased intra-ruminal pressure (mild distension) - hypoglycemia
51
list inhibiting factors affecting the reticulo-ruminal motility
- water deficiency - recumbency - increased intra-abomasal pressure - rumen acidosis - hyperglycemia - severe ruminal distension - pain (abdominal)
52
what microbes are found in the rumen?
bacteria, protozoa, anaerobic fungi
53
what are some positive effects of ruminal microbes
- they digest cellulose and hemicellulose via cellulases - provide high quality protein - provide B-vitamins - detoxification of toxic compounds
54
what compounds do microbes produce?
VFA, methane, CO2, and ammonia
55
what makes up VFAs?
- its the main energy source for ruminants | - acetate, proprionate, butryate
56
describe the microbiology of ruminal microbes
bacteria: mostly obligate anerobes protozoa: large, unicellular, prety on bacteria, numbers affected by diet fungi: low numbers, digest recalcitrant fiber
57
microbes occur in 3 main locations:
1. adhered tightly to the rumen wall (minor contribution) 2. associated with and attached to feed particles (major contribution) 3. floating freely in the rumen liquid phase (major contribution)
58
rsult of physical and microbial activities convert diet to:
useful products: VFA, microbial prtoein, B-vitamins useless products: methane, CO2 harmful products: ammonia, nitrate
59
absorption of VFA from reticulo-rumen
1. membrane on lumen side is permeable to free and anion forms of VFA 2. membrane on blood side is permeable to free acid form only 3. carbonic acid formed from CO2 and water acts as a H donor for VFA transport 4. bicarb is produced and released into the rumen
60
roughage diets high in cellulose and low in starch produce what?
active bacteria: cellulolytic and saccharolytic products: acetate
61
starch diets high in starch and low in cellulose produce what products and have what active bacteria?
active bacteria: amylolytic | products: propionate
62
what does proprionate form via the normal microbial process
proprionate --> lactate --lactate fermentation req'd--> pyruvate --> quick changes to high concentrates --> lactic acidosis
63
what is the effect of high quality forage and 20-50% concentrate on rumen content?
rumen content: pH 6-7; VFA = 60-70; acetate > proprionate > butyrate effect on health: normal, healthy
64
what is the effect of excessive forage of low quality and little concentrate
pH 6.5 - 7, low VFA and low microbial activity effect on health: poor production and growth, rumen impaction, protein energy, mineral and vitamin deficiency
65
what is the effect of 60% concentrate and low forage or fiber length
pH = 5 -6.5, high VFA and high microbial activity health effects: high production, rapid growth, chron. rumen acidosis, laminitis, ketosis and rumen parakeratosis
66
what is the effect of sudden exposure to extremely high level of concentrate
pH = 4 -5.5 high VFA and lactate health effects: acute rumen acidosis
67
what is the effect of normal level of forage, high protein/NPN concentrate
pH 6.5-7.5 low VFA and high ammonia health effects: rumen alkalosis, urea toxicity
68
what are the VFA ratios of acetate: propionate:butyrate on a roughage diet
acetate 65: propionate 25: butyrate 10
69
what are the VFA ratio of acetate: propionate:butyrate on a concentrate diet
acetate 50: propionate 40: butyrate 10
70
effects of rumen pH
effiency of microbial growth varies with changing rumen pH rumen pH from 5 - 7.2 - lower pH values associated with concentrate feeding cellulolytic bacteria - methanogenic bacteria and protozoa are severely affected once hte rumen pH falls below 6
71
changes in diet
most important factor influencing microbial numbers and proportions changing the diet invokes a period of transition in the microbial population wtih changing of numbers and proportions of species this adaptation period may take several days or weeks most dramatic changes in microbial population due to diet are associated with changes form a forage-based diet to one with highly fermentable carbohydrates (high concentrate diets)

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