NDSU Extension Service - Mercer County

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Sending Spayed Heifers to the Feedlot

heifers, spayed heifers, replacement heifers, feedlot

Submitted by Craig Askim, Extension Agent, Agriculture and Natural Resources

The spayed heifers are off the grass and ready for the feedlot. The Dickinson Research Extension Center spayed all the extra heifers and sent them to grass at the end of May and returned them home in mid-October.

They broke 2 pounds a day of average daily gain on grass and are heading to the feedlot at 940 pounds. The center had 102 yearling heifers last spring. After selecting 25 replacement heifers, 77 were spayed and sent to grass.

The cows have cycled well, and with weaning coming up, the pregnancy data will be calculated soon. The hope is that the pregnancy numbers from previous years will happen again this year.

Given the need to expand the cow numbers, sending a load of spayed heifers to the feedlot seems somewhat contrary to the needs of the industry. However, heifers born in May and June do not compete well in the fall as potential replacement heifers because of their smaller size.

When it comes to marketing, the other issue with May and June calving is that the vast majority of producers still calf in March and April. Heifers born in May and June will not be ready to breed at the time the majority of producers need to breed their heifers, so spaying is a good option.

Another issue that probably is the most convincing is that intact heifers make poor grass calves. Once puberty is reached and the heifers start to cycle, it is inevitable that a neighbor's bull is going to get in the pasture, so open heifers soon become bred heifers. That is not acceptable because there is no good outcome for feedlot heifers that are bred. Even in the best situation, the potential calving issues are risky, so spay those heifers that are not intended for replacement.

 Many producers consider spaying a heifer a complicated procedure. However, the veterinary community is well-trained, and neutering procedures routinely are performed on bull and heifer calves. Like any professional technique, if your local veterinarian does not spay heifers, he or she certainly would be happy to recommend a veterinarian who does.

This is the first set of heifers the center has fed, so the data will be interesting. The steer counterparts to the center's heifers have been summered on grass and have performed well in the feedlot following grass.

The center's steers have been divided into a feedlot only, pasture only or pasture with the addition of late-season annual crops. Although the heifers have grazed on pasture only, they gained comparably to the steers that only were on pasture the previous two years. The heifers actually gained slightly more than 2 pounds a day. Meanwhile, the steers that only were on grass were under 2 pounds of gain per day.

Although this is not a direct comparison, the opportunity for spayed heifers to grow on grass is good. At least in the North Country, heifers are routinely thought of as replacements. They generally are subjected to a thought process that has all the heifers treated as replacements to select the best replacements

Source: Kris Ringwall, North Dakota State University Extension Service Livestock Specialist

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