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- [4] EFFECT OF PROGESTAGEN INTRA-VAGINAL SPONGES AND PMSG ON SYNCHRONIZATION OF ESTRUS IN MAIDEN HEIFERS AND ON INTERVAL FROM CALVING TO ESTRUS IN BEEF-COWS NEW ZEALAND JOURNAL OF EXPERIMENTAL AGRICULTURE, 1980, 8 (3-4): : 199 - 203
- [5] Signs of oestrus after synchronization of oestrus in yak using progesterone impregnated vaginal sponge INDIAN JOURNAL OF ANIMAL SCIENCES, 2013, 83 (01): : 42 - 43