Livestock Management RANCHING
continues to increase. That’s when we tend to have bigger reductions in performance, and see the large heat-stress death losses that you fi nd in feedlots from time to time.” It’s best to prepare for heat stress before it occurs.
In addition to monitoring ambient conditions, keep a closer eye on animals at higher risk; such as newly arrived cattle, dark-coated cattle, and those that are in fatter body condition.
When the temperatures
change in a short period of time, heat stress can be induced at lower
temperatures, and earlier in the season.
Access to shade and to water sources that the cattle
can enter can ease the effects of heat, but Holland warns, “If there’s a pond where cows might take refuge from heat, is that the same source that provides their drinking water? If it’s a relatively small pond and the
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44 The Cattleman June 2015
thecattlemanmagazine.com
cows spend a lot of time there, that may reduce the freshness of the water. “If we are using automatic waterers or smaller
water tanks, we should have at least enough room for all of those animals to consume water.” In situations where cattle are receiving feed, that
can also be managed during times of heat stress to reduce the heat increment of the rations. If the fat content is increased, it can replace the energy the ani- mal gets from carbohydrates while reducing overall intake, as well as the amount of heat that would be associated with fermentation and digestion. Holland says, “Another thing to be mindful of is
handling or working cattle later in the day during times of heat stress. If it is going to be hot, try to do all those working events early in the day, before the impact of the sun really takes effect. Fly control would also be important. Allow cattle to choose to stand further from one another to prevent touching, which disrupts cooling.” And fi nally, make sure there is a quality trace
mineral block or mix available during the summer, so the animals can replace any electrolytes or minerals they lose by sweating.
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