By Gail Ellis

STILLWATER, Okla. – Varying degrees of drought across the state have caused cool-season grasses to grow a little later than usual this year, and Oklahoma State University Extension specialists have received reports of bloat in calves grazing wheat and other small grain pastures.

Growing conditions improved for these pastures, which have been grazed short this winter with regrowth that is all highly digestible leaf.

“We have also had some late winter frost events that can damage the cell walls in the new growth, releasing the cell contents for rapid availability in the rumen, said Paul Beck, OSU Extension beef cattle nutrition specialist. “These plant fractions are the most bloat provocative and can very quickly cause bloat in grazing calves.”

Death can occur rapidly from bloat, but so can relief. Calves can return to normal soon after supplements containing Bloatguard (Poloxalene 6.6%). Bloatguard is commercially available in blocks, mineral supplements and topdresses for concentrate supplements.

OSU Extension also offers the following guidelines in herd management this time of year.

Replacement heifers and spring breeding

“At this point in the year, typically if we’ve got normal wheat pasture in Oklahoma, it’s relatively easy to get those heifers to that target weight, but if we’ve been in a situation with limited hay and feed resources and we’ve not had any winter cool-season grass to graze, we might want to take inventory of those heifers,” said Mark Johnson, OSU Extension beef cattle breeding specialist. “If we’ve got some wheat pasture coming on or just need to adjust our feeding program, we’ve still got time to get those heifers to where they need to be to breed at 2 years of age.”

Body Condition score of cow herd

“Different feeding programs that we consider are supplemental feed, mineral supplementation and protein supplementation,” Johnson said. “You could add in an ionofore to cows’ diets if we need to put on a little weight and body condition score going into calving season. That way, we can get prompt breed back and keep them on schedule for calving once a year.”


Deworming can be the least expensive way for cattle to maintain or add body conditioning. Johnson recommends checking records and analyzing the cost effectiveness of deworming the herd.

Read more about preventing bloat in the Feb. 6 issue of OSU Extension’s Cow-Calf Corner Newsletter.

OSU Extension uses research-based information to help all Oklahomans solve local issues and concerns, promote leadership and manage resources wisely throughout the state’s 77 counties. Most information is available at little to no cost.

MEDIA CONTACT: Gail Ellis | Agricultural Communications Services | 405-744-9152 |