J. Anim Sci.
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J. Anim Sci. 1971. 32:1262-1267.
© 1971 American Society of Animal Science
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Monozygotic Bovine Twin Efficiency Values1

J. K. Ward, T. J. Klopfenstein, R. K. Christenson2, Walter Woods and Larry Rittenhouse3

University of Nebraska, Lincoln 68503

Abstract

Bovine Monozygotic (MZ) twin efficiency values (TEV) were determined for several characteristics of rumen fermentation and ration digestibility. The intake of chopped alfalfa or prairie hay had a TEV of 4 based on BW3/4. Twin efficiency values for protozoan concentrations were 1 at 4- and 24-hr, collection times. Twin efficiency values from 12 to 2 were found for total volatile fatty acid concentrations which were higher at 4-hr, after feeding than at 24 hours. Twin efficiency values were low for volatile fatty acid proportions with the exceptions of acetic acid for the 4-hr, collection in which the values were between 6 and 4. Apparent dry matter digestibility TEV were between 1 and 2. Blood urea nitrogen TEV were 3 and 1 for the 4- and 24-hr, collections, respectively. It would appear that MZ bovine twins may be more valuable than unrelated animals for determining level of feed intake, but the value of MZ twins over unrelated animals for studies involving rumen metabolism or digestibility of feedstuffs appears to be limited.

Footnotes

1 Department of Animal Science, Published with the approval of the Director as Paper Number 2760 Journal Series, Nebraska Agricultural Experiment Station.

2 Present address: Ohio Agricultural Research and Development Center, Wooster, Ohio.

3 Present address: Squaw Butte Experiment Station, Burns, Oregon.






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Copyright © 1971 by the American Society of Animal Science.