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Reproductive Capacity of Beef Bulls. V. Fertility and Freezability of Successive Ejaculates Collected by different Methods^1,2,3,

The Pennsylvania State University,⁵ University Park

Abstract

MAXIMUM genetic progress by artificial insemination depends on progeny testing sires at the youngest possible age and then exploiting those that prove to be genetically superior. Martig and Almquist (1969) found that fertility for 17 Angus and Hereford bulls was not influenced by ejaculation frequencies of one, three or six times weekly between 1 and 2 years of age. Fertility for these bulls was sufficiently high at puberty to initiate progeny testing; collection at the higher frequencies extended the possible number of matings (Cunningham et al., 1967). Weekly sperm output of beef bulls can be greatly increased by more frequent semen collection (Hupp et al., 1962; Almquist and Cunningham, 1967). O’Dell, Almquist and Amann (1959) reported that successive collection of 10 rather than two ejaculates per week from dairy bulls yielded about 2.5 times as many ampules of frozen semen and that time could be saved in semen processing and freezing.

¹ Authorized for publication as Paper No. 3599 in the Journal Series of The Pennsylvania Agricultural Experiment Station, University Park, on May 9, 1969.

² This project was sponsored in part with funds received from the Pennsylvania Fair Fund administered by the Pennsylvania Department of Agriculture, the Pennsylvania Association of Animal Breeders, the National Association of Animal Breeders and the Linde Company, Division of Union Carbide Corporation.

³ Appreciation is expressed to Amber R. Keene and Teresa F. Shirk for their technical assistance and to the personnel of Atlantic Breeders Cooperative, Lancaster, Pa., for their assistance and cooperation.

⁴ Present address: International Beef Breeders, P.O. Box 29007, Denver, Colo. 80229.

⁵ Dairy Breeding Research Center, Department of Dairy Science.