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The Mammals of Texas -
Online Edition
Feral Pig
Order
Artiodactyla : Family Suidae : Sus
scrofa Linnaeus
Description. Feral pigs in Texas
are descended from introductions of European wild hogs
for sporting purposes, and from escaped domestic swine
that have established feral populations. European wild
hogs have several distinguishing characteristics that set
them apart from domestic or feral hogs. Among these are
brown to blackish brown color, with grizzled guard hairs,
a mane of hair (8-16 cm long) running dorsally from the
neck to the rump, a straight heavily tufted tail, and
ears covered with hair. Characteristics of feral hogs are
varied, depending upon the breed of the ancestral stock.
European wild hogs and feral hogs interbreed readily,
with traits of European wild hogs apparently being
dominant.
Distribution in Texas. Feral
pigs have established sizeable, free-ranging populations
in various places on the Rio Grande and Coastal Plains,
as well as the wooded country of eastern Texas.
Habits. Good feral hog habitat
in timbered areas consists of diverse forests with some
openings. The presence of a good litter layer to support
soil invertebrates and/or the presence of ground
vegetation affording green forage, roots, and tubers is
desirable. Hogs are also fond of marsh and grass-sedge
flats in coastal areas, particularly if wild grapes are
common. During hot summer months, "wallows," or
depressions dug in the mud by feral hogs, are much in
evidence near marshes or standing water, such as along
roadside ditches.
On the Texas coast, feral pigs eat a
variety of items, including fruits, roots, mushrooms, and
invertebrates, depending on the season. The major foods
in spring are herbage, roots, invertebrates, and
vertebrates. Fruit, invertebrates, and herbage are most
common in fall and winter diets. Herbage eaten by feral
pigs includes water hyssop, pennywort, frog fruit,
spadeleaf, onion, and various grasses while important
roots used for food include bulrush, cattail, flatsedges,
and spikesedges. Fruits and seeds such as grapes, acorns,
and cultivated sorghum are important, and animal matter
ingested by feral pigs includes earthworms, marsh fly
larvae, leopard frogs, snakes, and rodents.
Feral pigs can have detectable
influences on wildlife and plant communities as well as
domestic crops and livestock. Extensive disturbance of
vegetation and soil occurs as a result of their rooting
habits. The disturbed area may cause a shift in plant
succession on the immediate site. Feral pigs also
compete, to some degree, with several species of wildlife
for certain foods, particularly mast.
Feral pigs generally breed year round;
litters range from one to seven, averaging two per sow.
An average of one to three suckling pigs usually
accompanies brood sows. The heat period is only about 48
hours in duration and the average gestation period is 115
days.
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