Which of the following has been recently used for increasing the productivity of super milch cows?

  • A
    Artificial insemination by a pedigreed bull only
  • B
    Superovulation of a high-production cow only
  • C
    Embryo transplantation only
  • D
    $A$ combination of superovulation,artificial insemination,and embryo transplantation into a 'carrier cow' (surrogate mother)

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