Assertion : Cattle breeds can be improved by superovulation and embryo transplantation. Reason : Superovulation in high milk-yielding cows is induced by hormonal injection.

Superovulation is an effort to increase the fertility of cattle breeds. Inducing an animal to ovulate multiple oocytes can translate into producing more offspring from selected females. For superovulation. donor cows of particularly fine pedigree are treated with hormones (mainly FSH and LH) to increase the number of eggs released at ovulation - multiple ovulation (MO). The cows are artificially inseminated using semen from a proven bull. After 6 - 7 days the embryos are collected non-surgically, and then implanted into recipient cows whose oestrous cycle is at the correct receptive stage - usually as the result of hormonal manipulation.