Breeds of Cattle
Cattle
are considered to have been one of the first animals domesticated
by man for agricultural purposes. They were tamed
to provide milk, meat and hides and for draft purposes. The
exact time and place this happened is hidden in the mists
of antiquity, but it is thought they were probably first
domesticated in Europe and Asia about 8500 years ago.
Domesticated
cattle are in the family Bovidae which includes
ruminates with paired, hollow, unbranched horns that do not
shed and an even number of toes. They belong to the
genus Bos and the subgenera Taurine which includes
the two species tarus and indicus.
Cattle are ruminants (as are
sheep, goats, deer, and giraffes), which gives them
a unique digestive system that allows the digestion of otherwise
unuseable foods by regurgitating and rechewing
them as cud. They thrive on grasses
and other low quality plants
built predominantly of cellulose.
Cattle have one stomach that has four compartments. They are named the rumen,
reticulum, omasum, and abomasum. The rumen is the largest compartment
and is like a fermentation tank, providing the
anaerobic environment, constant temperature and pH, and constant
mixing that allows microbes to break down the cellulolse.
The reticulum, known as the "Honeycomb",
is is the smallest compartment. The
omasum's main function is to absorb water and nutrients and
is known as the "Many Plies." The
abomasum is most like the human stomach; this is why it is
known as the "True Stomach."
All
breeds of British and European cattle like Angus, Hereford,
Charolais and Simmental belong to the tarus species. The
humped cattle of the tropical countries like Brahman and
Africander belong to the indicus species. Many
contemporary breeds are the result of crossing two or more
of the older breeds. Most of the new breeds originating
in the United States were developed in the Southern states
where the standard breeds lacked resistance to heat and insects
and did not thrive on the native grasses. Other Bovidae that
are so closely related to true cattle that they can interbreed
include the bison, buffalo, and yak.
Purebred
cattle breeds have been selectively bred over a long period
of time to possess
a distinctive identity in color, size, conformation, and function and have
the prepotency to pass these traits to their progeny.
The world
cattle population is estimated to be about 1.3 billion head,
with about 30 percent in Asia, 20 percent in South America,
15 percent in Africa, 14 percent in North and Central America,
and 10 percent in Europe. The 10 states in the US with
the largest cattle populations are Texas, Missouri,
Oklahoma, Nebraska, South Dakota, Montana, Kansas, Iowa,
Kentucky, and Florida.
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