Hignett & Boyd TABLE I HEIFERS SHOWING OESTROUS MANIFESTATIONS DURING TREATMENT PERIOD Number of Heifers OESTROUS MANIFESTATIONS Total ke Sponges - o STANDING - 5 5 3 RED KaMaR only 10 2 8 TOTAL 15 5 R TABLE II FIRST POST-TREATMENT OESTRUS Days after beginning of treatment INO 21-25!26-50 31-35|36-40 45-50 e HEIFERS All heifers Heifers which retained original sponges through- out treatment period 0 1 0 1 % 0 0 0 0 1456