(D) In artificial insemination, the semen collected from superior bulls is used immediately or can be frozen for later use. To preserve the viability

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(D) In artificial insemination, the semen collected from superior bulls is used immediately or can be frozen for later use. To preserve the viability of the sperms for long periods, they are stored in liquid nitrogen at a temperature of $-196^{\circ}C$. This process is known as cryopreservation.