More Comfort, More Milk

September 23, 2010 11:52 AM

ZachMyers 125x125Zach Myers 

Jonesville, N.C.

Myers Dairy, in the Appalachian foothills, is home to 830 Holsteins and 700 replacements.



August prices


(3.5% bf, 3.0% prt) $18.15/cwt.

Cull cows

Springing heifers $1,500/head

Ground corn $200/ton

Soybean meal $400/ton

Alfalfa hay
Don’t use

Don’t use

A comfortable cow makes more milk. So I strive to keep our cows as comfortable as possible.

North Carolina is known for its temperate climate. We are far enough south to have some hot, miserable summers but still far enough north to have some snow and ice to deal with as well. We don’t have the extreme cold of the Upper Midwest and New England, nor do we have the length of high heat and humidity that the extreme South has.

North Carolina is a great place to milk cows eight to nine months out of the year. The duration of the cold weather we deal with doesn’t normally present many problems, but the three to four months of summer can be challenging.

Heat abatement is crucial to maintaining production and reproductive performance in the summer months. The best way to keep cows cool is by moving the air and using water.

We have been using fans in our operation since I can remember and added misters 20 to 25 years ago before it was a common thing to do. It was a good concept at the time. If you cool the air down around the cows, your cows will stay cooler. This did help to maintain a higher production level through the summer than fans alone, but reproductive performance was not much improved.

Five years ago, with new research and technology, we changed from the theory of cooling the air around the cow to cooling the cow herself. We removed misters from fans and installed a programmable sprinkler system above the feedbunk and in the holding area of the parlor.

The fans come on when the temperature reaches 64°F. At 70°F, the sprinklers come on for one minute, wetting the cow every 10 minutes. When the temperature reaches 80°F, the sprinklers come on for one minute every six minutes.

Through evaporative cooling, my cows are staying cooler now than before. Instead of a 20 lb. per cow production decrease in warm weather, we have only an 8 lb. to 10 lb. per cow decrease.

Just as important has been the increase in the reproductive performance of the cows. We are still able to get cows pregnant in the summertime. Prior to installing the sprinklers, it was not infrequent to get only two or three new pregnancies in a week, sometimes none. I now typically get double-digit new pregnancies every week and less open cows on recheck.

With more consistency in reproduction comes more consistent cow numbers in the milking herd. We don’t have the swing in lactating cow numbers that we used to have. Keeping cows cooler in the summer allows them to go into the cooler months healthier, which certainly does not hurt production or reproduction.

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