Progesterone impregnated intra-vaginal device and timed artificial insemination (TAI) on fertility in repeat breeding Jersey crossbred cows
Loading...
Date
2019-08
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Interest in bovine infertility increased with the
introduction of artificial insemination in the 1950s and as
the factors involved became known to farmers, herdsmen
physiologists and other workers (Roberts 1956). The causes
of infertility in bovine are many and can be complex (Arthur
1982) and they relate to Graafian follicle development and
maturation, estrus onset, successful coitus, ovulation,
fertilization, implantation, development and delivery of the
fetus and its membranes. Anything that interferes with these
routines makes the animal infertile (Osmanu 1979). One
calf from cow per year is the reproductive objective for
dairy animals. Nevertheless, this is not always attained and
cows must be re-inseminated during several consecutive
cycles. In this context appears the Repeat Breeder Cow
syndrome (RBC), comprising a heterogeneous group of subfertile
cows, without anatomical abnormalities nor
infections, that exhibit a variety of reproductive disturbances
in a consistent pattern during the course of 3 or more
consecutive estrous cycles of normal duration (17–25 days).
Description
TNV_IJAS_2019_89(8)853-854
Keywords
Veterinary Science