Abstract

Abstract Two experiments are described in which the time relationships of oestrus and ovulation and fertility to artificial insemination in sexually mature Friesian heifers are compared with similar animals treated with PGF2a alone or in combination with SC21009. It is concluded that neither treatment adversely affects the parameters studied but that the combined treatment will lead to an enhanced oestrous response; and offers a practical method of oestrous synchronisation at farm level.

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