J. Anim Sci.
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J. Anim Sci. 1975. 40:288-301.
© 1975 American Society of Animal Science
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Growth and Feed Efficiency and Their Relationship to Puberal Traits of Charolais Bulls1, 2,

K. A. Barber and J. O. Almquist3

The Pennsylvania State University,4, University Park 16802

Abstract

Twenty-two purebred Charolais bulls were fed concentrate ad libitum from weaning through 550 days of age. Puberty, defined as the age at which the first ejaculate containing a minimum of 50 x 106 sperm with at least 10% showing progressive motility was collected by artificial vagina, was attained at a mean age of 41 ± 1 weeks and a mean body weight of 396 ± 13 kilograms. One bull was removed from experiment after 365 days of age because of chronic bloat, three bulls lacked data for feed consumption and six bulls had not attained 2 years of age when the data were analyzed. Mean body weights of 356 ± 10, 520 ± 11, 744 ± 14 and 859 ± 20 kg were recorded at 265, 365, 550 days and 2 years of age, respectively. Average daily gain (ADG) and feed efficiency during a 285-day test (265 to 550 days of age) averaged 1.35 ± .03 and 8.09 ± .16 kilograms.

Footnotes

1 Authorized for publication as Paper No. 4702 in the Journal Series of The Pennsylvania Agricultural Experiment Station, University Park, on May 21, 1974.

2 Supported in part by Atlantic Breeders Cooperative, Lancaster, Pa., Northeastern Breeders Association and Sire Power, Inc., Tunkhannock, Pa., and the American-International Charolais Association, Houston, Texas.

3 Appreciation is expressed to Dr. L. L. Wilson, Mr. M. Holsopple, Mrs. A. Keene, Mrs. H. Homan and Mrs. T. Shirk for their assistance. This paper is a portion of the M.S. thesis of the senior author.

4 Dairy Breeding Research Center, Department of Dairy Science.






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Copyright © 1975 by the American Society of Animal Science.