“…dealing with Friesians; Newcomb, 1980). Apart from dose level considerations, reports have occasionally appeared in the literature suggesting that the superovulatory effect of PMSG may vary with the particular batch employed (Baker, 1973;Bowen, 1973;Rowson, 1973). The PMSG molecule certainly possesses both FSH-and LH-like properties and it was this that led some to suggest that the ratio of these components may differ among the batches of the preparation available to laboratories and thereby influence ovarian response (Lamond, 1970).…”