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Timely Topic Archive
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Genetic Correlations Between Postweaning Feed Efficiency and Cow Traits
Australian scientists used postweaning records on 1781 bulls and heifers individually tested for feed efficiency, and cow records taken at 4 yrs. of age on 751 of the same heifers to estimate genetic correlations between postweaning feed efficiency and certain cow traits.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Jan-26-05
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An Inexpensive Measure of Feed Efficiency in Beef Cattle
Residual feed intake (RFI), an accurate predictor of feed efficiency, is difficult and expensive to measure.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Feb-11-05
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Selecting A.I. Sires for Maximum Profit
The economic concept of net present value (NPV = future value [$] of net genetic gain discounted to present value [$] by adjusting for interest and inflation) was used by Washington State Univ. scientists as a method of selecting A.I. beef sires for maximum profit over a 3-generation time horizon.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Mar-08-05
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Genetic Relationship Between Heifer Pregnancy and Scrotal Circumference
Colorado State Univ. and Brazilian researchers used 43,511 records on Nellore heifers and young bulls to determine the heritabilities of yearling heifer pregnancy and scrotal circumference, and the genetic correlation between the two traits.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Mar-15-05
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EPDs of Sires Compared Favorably With Actual Performance of Progeny
Even though expected progeny differences (EPDs) have been around since the mid-1980s, some skepticism still exists about their effectiveness as a selection tool.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: May-04-05
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British and Continental Breeds Still Differ Significantly in Carcass Traits but Are Now Similar in Growth
U.S. MARC scientists recently reported final carcass and meat palatability results of Cycle VII of the Germ Plasm Evaluation (GPE) program.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: May-11-05
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Calf Survival Rate Was Higher When Postpartum Behavior of Cows Was More Aggressive/Protective
Univ. of Arkansas workers analyzed 25 years of data from five breed groups of cows to determine variables affecting cow behavior at calving time.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Jun-13-05
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Using Ultrasonic Backfat, Ribeye and Other Measurements to Predict Carcass Composition of Young Bulls
Recent genetic evaluations have tended to use ultrasound measurements on young seedstock cattle—primarily yearling bulls—rather than carcass measurements from commercial progeny.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Jul-26-05
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Ratio of Calf Weaning Wt. to Cow Wt. is Not an Effective Criterion for Evaluating Efficiency
Even though previous research at South Dakota State Univ. (Dinkel and Brown, 1978) showed that the ratio of a calf’s weaning wt. to its dams wt. as an indicator of cow efficiency had very little advantage over weaning wt. alone in predicting efficiency (TDN consumed by cow and calf divided by calf weaning wt.), there continues to be interest in its use as a measure of efficiency.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Aug-15-05
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Crossbreeding Reduced Incidence of Respiratory Disease
Bovine respiratory disease (BRD) is the most costly beef cattle disease in the U.S.
Author: Dr. Rick Rasby, Professor of Animal Science
Date published: Aug-19-05
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