1 December 1995

New ovulation technique

EMBYRO numbers produced by super-ovulation of dairy cows can be increased by removing the dominant follicle (immature egg) from the ovary.

This is the result of Canadian research reported by ET technician Chris Gwyn, Western Ontario Breeders, Woodstock.

"The dominant follicle restricts the growth of other follicles on the cows ovary," he says. "Removing this increases the number of follicles that develop and therefore the number of embryos produced."

For cows that fail to respond to super-ovulation with hormone injections – only producing one or two embryos – the number of embryos collected can be increased to five or six, he adds.

"Removing the dominant follicle increases the number of embryos produced," says Chris Gwyn.