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Effects of Age and Gonadotropin Treatment on Superovulation in the Calf^{1, 2,}

Cornell University, Ithaca, New York 14850

Abstract

Souperovulation of the calf has been reviewed by Onuma, Hahn and Foote (1970). Mean superovulatory response often has been adequate, but variability always has been extreme. Only a small percentage of the ovulation points has resulted in recovered ova, and cleaved ova have been rare until recently (Onuma et al., 1970). The aim of our work was to find improved methods of obtaining viable fertilized ova from calves of several ages by varying gonadotropin treatments and the time of ova recovery.

Holstein calves, several days of age, were purchased locally and with the exception of one group were housed individually and fed a standard diet (Onuma et al., 1970). The usual sequence of treatments started with an intramuscular (i.m.) injection of pregnant mares' serum gonadotropin (PMSG) followed in 5 days by pituitary luteinizing hormone (LH) given intravenously (i.v.). Ova usually were recovered 3 or 5 days later. Specific designs, including age of the calves used, are described for each experiment along with the results.

¹ Department of Animal Science.

² This work was supported in part by Grant HD 03471 from the National Institute of Child Health and Human Development. The PMSG was kindly supplied by Dr. Deghenghi and Dr. Lindsay of Ayerst Laboratories and the PLH by Dr. Trout of Armour-Baldwin Laboratories. Also the technical assistance of M. Simkin is gratefully acknowledged.

³ Present address: Department of Anatomy, Harvard Medical School, Boston, Massachusetts 02115.

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