Feed Lot

APR-MAY 2018

Feedlots and cow/calf operations in the beef industry who feed 500 or more has annually on grains and concentrates; maintain 500 or more beef cows; backgrounder, stocker/grower, preconditioner; veterinarian, nutritionist, consultant

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FEED•LOT April/May 2018 15 something that is really dramatic." As cow/calf operators have come to trust and rely on other genetically predictable traits, the ability to predict the fertility and longevity of a mother cow will be very important to cow/calf producers. Many of us in the in- dustry will be curious to follow the results of the trials on the Nancy M. Cummins REEC mother cows. FL of the Rock Creek Ranch, near Hailey, Idaho, allows the Nancy M. Cummins REEC to split the herd and run half of the mother cows in a more traditional Idaho range en- vironment, while the other half remains at the center on irrigated pasture. Using feed efficiency in- formation that was gathered on the heifers at the Nancy M. Cummins REEC, Dr. Jim Sprinkle has been running a trial to find out if the first-calf heifers and young cows that are efficient use the range differently than young heifers and cows that are inefficient. This involves using GPS collars on the heifers and young cows to see how those animals utilize the range. Dr. Hall said, "Looking at lifetime productivity is going to take us awhile. We have efficiency testing that was done when they were heifers, and now they are four and five year old cows. It's going to take us awhile to look at the longevity side of things, unless there is

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