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SYNCHRONIZATION OF OESTRUS AND SUBSEQUENT FERTILITY OF BEEF CATTLE FOLLOWING THE INTRAVAGINAL ADMINISTRATION OF GESTAGEN

Among various ways of synchronizing oestrus with synthetic gestagen, the intravaginal route of administration as established for sheep by Robinson (1965) seemed to be interesting from the standpoint of both fundamental research work and practical application. No reports have appeared so far on the use of this technique in cattle and the authors, therefore, carried out an experiment using intravaginal gestagen-impregnated sponges. Although insufficient animals were used to draw a final conclusion, the results obtained seem to indicate some problems and these are described briefly.

Twelve Japanese Black cattle with good calving histories and regular oestrous cycles were used. They were still rearing their young, which had been born 3 to 6 months earlier. The cows were