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DO RABBITS CHEW THE CUD?–BY LEONARD R. BRAND

 1. Articles
 2. Origins
 3. 1977 – Volume 04-2

Download PDF June 1, 1977

 

DO RABBITS CHEW THE CUD?

BY
LEONARD R. BRAND
CHAIRMAN, DEPARTMENT OF BIOLOGY
LOMA LINDA UNIVERSITY

WHAT THIS ARTICLE IS ABOUT

This is an example of a purported error in the Bible. Leviticus 11:6 states that
the hare chews the cud, while scientific information is generally believed to
dispute the statement. However, there are more recent findings regarding the
digestive patterns of the hare. Like the cow, it has a fermentation chamber with
micro- organisms to digest plant material. The hare and others of its type
produce two kinds of fecal pellets; one kind is reingested and temporarily
stored in the stomach until redigestion takes place, thus increasing the
efficiency of food intake. This is quite similar to what goes on in the
cud-chewing animals, like the cow, except that travel of the partially digested
food is outside the body instead of a reverse internal pattern as found in the
cow.

Leviticus 11:6 is sometimes used as an example of an error in the Bible; it
states that hares chew the cud. Hares are not usually known as cud-chewing, or
ruminating, animals. Is this really an error in the Bible, or did Moses know
what he was talking about?

When a cow swallows a mouthful of grass, it goes first of all to one compartment
of the stomach referred to as the rumen. The culture of microorganisms that
exists in the rumen digests the grass and converts much of it into nutrients
which the cow can utilize. Then the cow brings the microorganisms and leftover
grass back to her mouth, one mouthful at a time. She chews it and sends it on
through the rest of her digestive tract. Thus the cow really doesn't subsist
directly on grass alone, but also on the protozoa and bacteria that she breeds
in her rumen (Carles 1977).

The process of digestion of grass by microorganisms is referred to as
fermentation, and it occurs in many other animals besides the cloven-hoofed
ruminating animals. Special fore-stomachs for fermentation are also found in
kangaroos, whales, dugongs, hippopotamus, sloths, and colobid monkeys (McBee
1971). Other modifications of the stomach or some part of the intestines to
provide a fermentation chamber are found in rodents, rabbits and hares,
gallinaceous birds, horses, hyrax (McBee 1971), and in mallards (Miller 1976).

Some herbivorous animals consume part of their own feces, thus recovering
fermentation products that have passed through the digestive tract. This process
of reingestion of feces occurs in many rodents (Thacker and Brandt 1955) and in
all genera of hares and rabbits (Carles 1977; Hamilton 1955; Kirkpatrick 1956;
Lechleitner 1957; McBee 1971; Myers 1955; Southern 1940; Watson 1954; Watson and
Taylor 1955). Reingestion of feces is an especially well-developed practice in
Lagomorphs (rabbits and hares) and is important for their adequate nutrition.

Lagomorphs produce two kinds of fecal pellets which are produced at different
times during the day. When the animals are active and feeding they produce the
familiar hard pellets. When they cease their activity and retire to their
burrows or resting areas, they begin producing soft pellets which they eat as
soon as they are passed (Myers 1955). Rabbits reingest 54-82% of their feces
(Eden 1940), which they apparently swallow whole, without chewing (Watson 1954).

The soft pellets are composed of material from the fermentation chamber, which
in the Lagomorphs is located in the cecum, a blind pouch at the beginning of the
large intestine (McBee 1971). The soft pellets are composed mainly of bacteria,
mixed with some plant material, and each pellet is enclosed in a proteinaceous
membrane secreted posterior to the colon. These tough membranes remain intact
for at least six hours after reingestion. When swallowed they pass to the fundus
portion of the stomach, where they remain for several hours (Griffiths and
Davies 1963). Other food that is swallowed moves past the accumulation of soft
pellets and goes on through the digestive tract. The membranes around the
pellets and a buffering solution in the pellets control the pH, so that
fermentation continues in the pellets even though the rest of the stomach is
acid (Griffiths and Davies 1963).

The process of cecal fermentation and reingestion helps the rabbit in several
ways. Amino acids and proteins are synthesized by the bacteria in the cecum,
using nonprotein nitrogen (perhaps urea). Amino acids are absorbed directly
through the walls of the cecum and provide 4.4-21.8% of the animal's daily
energy requirement (McBee 1971). Proteins synthesized in the cecum are carried
to the stomach in the soft pellets. This protein is important to the nutrition
of the rabbit. Experiments have shown that "nitrogen balance in the rabbit was
reduced 50% if soft feces were not eaten" (McBee 1971). Fermentation and
reingestion also improve utilization of sodium and potassium and provide 83%
more niacin, 100% more riboflavin, 165% more pantothenic acid, and 42% more
vitamin B12 than would be available if soft feces were not consumed (McBee 1971;
Myers 1955).

Is this special digestive process analogous to the rumination, or cud-chewing,
in cows? There are both similarities and differences between the two processes.
The rabbits are different in that they do not have a four-part stomach with a
rumen, and the material that reaches their fermentation chamber has already been
chewed and partially digested. Cows and rabbits are similar in that they both
have a fermentation chamber with microorganisms that digest otherwise
indigestible plant material and convert it to nutrients. Some of the rabbit
microorganisms are different from those in cows, but many of them are the same
or similar (McBee 1971). Both cows and rabbits also have a mechanism to pass the
contents of their fermentation chamber back to the mouth and then on through the
digestive tract.

Madsen (1939) wrote an article entitled "Does the Rabbit Chew the Cud?" Southern
(1940) concluded that reingestion has an advantage to the rabbit "equivalent to
'chewing the cud'." Griffiths and Davies (1963) concluded that "we consider that
the fundus of the rabbit stomach, loaded with soft pellets, is analogous to the
rumens of sheep and cattle."

Carles (1977) compared cows and rabbits and reached the conclusion that
rumination should not be defined from an anatomical point of view (the presence
of a four-part stomach), but rather on presence of an adaptation for breeding
bacteria to improve food. On this basis he stated that "it is difficult to deny
that rabbits are ruminants."

What is the correct explanation for Leviticus 11:6 — is it an error in the
Bible, or is it evidence that Moses had a source of information far ahead of his
time? Since rabbits and hares have a process that is so similar to cow
rumination that it becomes a question of the technicalities of one's definition
of rumination, it would be difficult to justify interpreting Leviticus 11:6 as
an error in the Bible.

REFERENCES

 * Carles, Jules. 1977. The rabbit's secret. CNRS Research No. 5, pp. 34-37.
 * Eden, A. 1940. Coprophagy in the rabbit. Nature 145:36-37.
 * Griffiths, Mervyn and Davies, David. 1963. The role of the soft pellets in
   the production of lactic acid in the rabbit stomach. Journal of Nutrition
   80:171-180.
 * Hamilton, W.J., Jr. 1955. Coprophagy in the swamp rabbit. Journal of
   Mammology 36:303-304.
 * Kirkpatrick, Charles M. 1956. Coprophagy in the cottontail. Journal of
   Mammology 37:300.
 * Lechleitner, R.R. 1957. Reingestion in the black-tailed jack rabbit. Journal
   of Mammology 38:481-485.
 * Madsen, Holger. 1939. Does the rabbit chew the cud? Nature 143:981-982.
 * McBee, Richard H. 1971. Significance of intestinal microflora in herbivory.
   Review of Ecology and Systematics 2:165-176.
 * Miller, Michael R. 1976. Cecal fermentation in mallards in relation to diet.
   The Condor 78:107-111.
 * Myers, K. 1955. Coprophagy in the European rabbit (Oryctolagus cuniculus) in
   Australia. Australian Journal of Zoology 3:337-345.
 * Southern, H.N. 1940. Coprophagy in the wild rabbit. Nature 145:262.
 * Taylor, E.L. 1941. Pseudo-rumination in the rabbit. Proceedings of the
   Zoological Society of London 110:159-163.
 * Thacker, Edward J. and Brandt, C. Stafford. 1955. Coprophagy in the rabbit.
   Journal of Nutrition 55:375-385.
 * Watson, J.C. 1954. Reingestion in the wild rabbit, Oryctolagus cuniculus
   (L.). Proceedings of the Zoological Society of London 124:615-624.
 * Watson, J.S. and Taylor, R.H. 1955. Reingestion in the hare Lepus europaeus
   Pal. Science 121:314.

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