Department of Animal Science


Date of this Version

January 2003


Published in 2003 Nebraska Beef Cattle Report. Copyright © 2002 The Board of Regents of the University of Nebraska.


A winter and a summer trial were conducted to evaluate growth promoting strategies among season for yearling heifers fed feedlot finishing diets. Two hundred seventy Angus crossbred intact yearling heifers were used for each trial. Daily dry matter intake and daily water intake were recorded and average daily gain and feed efficiency were calculated. A growth promotant by season interaction was found for dry matter intake only. Performance was improved in both summer and winter when a growth promoting system was used. In the summer, adding melengestrol acetate to estrogenic and androgenic implants strategies tended to stimulate DMI, while in the winter DMI was suppressed by the addition of melengestrol acetate. Heifers had higher gains and intakes in the winter but more efficient gain in the summer.