J. Anim Sci.
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J. Anim Sci. 1979. 49:832-837.
© 1979 American Society of Animal Science
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Effects of Concentrate Level, Protein Source and Growth Promotant: Behavior and Behavior-Performance Relationships1

W. R. Stricklin2, L. L. Wilson3, H. B. Graves4 and E. H. Cash3

The Pennsylvania State University, University Park 16802

Abstract

Ninety-six Hereford steers were randomized into groups of eight, and each group was confined in one of 12 pens. Each pen of steers was assigned one of six supplemental protein treatments and fed at one of two energy levels. Four steers in each pen were implanted with zeranol (Z)5, and four were implanted with estradiol-benzoate and progesterone (EBP)6. Individual animal activity patterns, ingestive behavior and agonistic behavior were examined as a function of protein source, energy level and implant type. Protein treatment affected standing (P<.05), lying (P<.01) and walking (P<.01) but not ingestive or agonistic behavior. Energy level affected standing (P<.01) and walking (P<.01) activity as well as incidence of drinking (P<.05), but not eating, activity. Implant type affected only agonistic behavior (P<.05; EBP- and Z-implanted steers were successful in 54.3 and 43.7% of their agonistic encounters, respectively. Based on correlations, steers that were larger at the initiation of the experiment were less active during the trial, grew faster and were more successful in agonistic encounters than were smaller steers within the same pen.

Footnotes

1 Authorized for publication as Paper No. 5433 of the Journal Series of the PAES.

2 Present address: Dept. of Anim. and Poul. Sci., Univ. of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N OWO.

3 Dept. of Dairy and Anim. Sci.

4 Dept. of Poul. Sci.






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Copyright © 1979 by the American Society of Animal Science.