Summary and Implications
Angus first-calf heifers were evaluated for feed intake utilizing the Feed Intake Monitoring System developed at ISU. Average dry matter intake for the feeding period was 3877 pounds with difference in dry matter intakes from the lowest to the highest intake female averaging 2143 lbs over the three years of the study. During the study an average difference between the lowest and highest consuming firstcalf heifer was 22.3 lbs daily to 38.4 lb. Feed intake during first year lactations between negative and positive RFI groups appears small after three years of observation; however, complete statistical analysis has not been accomplished at this writing.
Iowa State University
Strohbehn, Daryl R. and Dahlke, Garland R.
"Relationship Between Feed Efficiency Measures During the
Heifer Development Stage and Measures Taken During First
Lactation in Purebred Angus—Third Year Progress Report,"
Animal Industry Report:
AS 657, ASL R2580.
Available at: http://lib.dr.iastate.edu/ans_air/vol657/iss1/4