- Joined
- Apr 1, 2010
- Messages
- 802
- Reaction score
- 1,133
"Heat stress doesn't happen all at one time. Cattle accumulate heat during the day, and then over the nighttime hours, it takes four to six hours for them to dissipate that heat. As long as we have a cooling effect at night, cattle can mostly handle the heat. Where we run into issues is where we have two to four days in a row of minimal nighttime cooling, and we start the day with the heat load we accumulated the day before still there," he said.
Tarpoff, who spoke with DTN, worked as an associate feedlot veterinarian in Canada before moving to Kansas. He said it's not uncommon to see issues with heat stress even that far north. And he pointed out that not all animals within a herd, group, or pen are affected by heat stress in the same way. A previous bout with respiratory disease that may have led to scarred lungs can make it difficult for that animal to cool itself. And there are other pretty basic reasons some cattle just don't handle the heat as well as others.
"The second week of June is when, historically, we start to see this, and I think a lot of it has to do with the hair coat. Cattle can adapt to almost any environment on earth, but they need time. At this point in the season, a lot of them have not fully shed that winter hair coat and slicked off," he said, adding that the fact that the majority of the U.S. cow herd is black also means they can't cool as efficiently.
In this most recent reported loss, many of the animals appeared close to going to processors. They were fat, and Tarpoff added that in cases like this, once these layers of fat develop, it can put animals at more risk of heat stress.
www.dtnpf.com
Tarpoff, who spoke with DTN, worked as an associate feedlot veterinarian in Canada before moving to Kansas. He said it's not uncommon to see issues with heat stress even that far north. And he pointed out that not all animals within a herd, group, or pen are affected by heat stress in the same way. A previous bout with respiratory disease that may have led to scarred lungs can make it difficult for that animal to cool itself. And there are other pretty basic reasons some cattle just don't handle the heat as well as others.
"The second week of June is when, historically, we start to see this, and I think a lot of it has to do with the hair coat. Cattle can adapt to almost any environment on earth, but they need time. At this point in the season, a lot of them have not fully shed that winter hair coat and slicked off," he said, adding that the fact that the majority of the U.S. cow herd is black also means they can't cool as efficiently.
In this most recent reported loss, many of the animals appeared close to going to processors. They were fat, and Tarpoff added that in cases like this, once these layers of fat develop, it can put animals at more risk of heat stress.

Heat Stress Kills Estimated 10,000 Head of Kansas Feedlot Cattle
The numbers are still coming in, but early estimates set the number of cattle lost to heat in Kansas feedlots this week at an estimated 10,000 head.