because of injuries to, and deformities of, the parts and tumor growths.
Deformed genital organs and obstructions of the os by growths and scar
tissue are causes of sterility in the female.

Failure to breed is commonly caused by faulty methods of feeding and care.
Over-feeding and insufficient exercise may result in the body tissues
becoming loaded with fat. This may cause a temporary sterility, but if
persisted in, as is frequently the case in show animals, the sterility
becomes permanent because of the genital glands failing to secrete ova and
spermatozoa, or the lack of vitality of the male and female elements. Old
age and debility from disease or poor care may induce loss of sexual desire
and an absence of, or weakened spermatozoa in, the seminal fluid. The
refusal of the male to serve certain females is sometimes noted.

Tuberculosis may affect the ovaries and cause permanent sterility. In
inflammation of the lining membrane of the womb and vagina, the secretions
are abnormal and may collect in the womb and the passages leading to it.
These secretions destroy the vitality of the spermatozoa, and this
condition may be considered a common cause of sterility in the larger
animals. Many vigorous young males are made impotent by excessive
copulation. The excessive use of the male at any time may result in failure
to impregnate a large percentage of the females that he serves.

Barren females do not become pregnant after frequent intercourse with the
male. Young sterile females may not come in heat. Sometimes unnatural
periods of heat are manifested, the animal coming in heat frequently or
remaining in heat for a longer period than usual. This sometimes occurs in
tuberculosis of the ovaries. In chronic inflammation of the maternal
passage there is more or less discharge from the vulva. Both sexes may be
overly fat or weakened and debilitated by disease. Deformity of the