Ask the Vet
Brood Cow Size
READER QUESTION:
Is there an optimal size for brood cows?
I think many producers have unknowingly allowed their cows to get too large for their production systems. By focusing on weaning weights in their calves and using the cheap supplements of the recent past, they have selected for more growth in the heifers they retain.
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DR. KEN MCMILLAN'S ANSWER:
I was always taught a cow should wean about 50% of its body weight. Calves with adjusted weaning weights of 550 to 650 pounds work well in our stocker and feedlot system and on the rail. So, if we do the math, that puts the ideal cow at 1,100 to 1,300 pounds. If it were only that simple.
Some producers, especially those in the grass-fed niche, feel cows that weigh less than 1,000 pounds work best. And I have several very good producers whose cows average between 1,400 and 1,500 pounds. So, one size does not fit all.
What is the take-home message? Weigh your cows and calves, collect data and do the math. Never assume your largest calves are the most profitable. At today's input and calf prices, a 1,500-pound cow would have to wean at least 50 pounds and possibly up to 100 pounds more calf than a 1,200-pound cow to recover the higher carrying cost.
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Editor's Note: Please contact your veterinarian with questions pertaining to the health of your herd or other animals. Every operation is unique, and the information in this column does not pertain to all situations. This is not intended as medical advice but is purely for informational purposes.
Write Dr. Ken McMillan at Ask the Vet, 2204 Lakeshore Dr., Suite 415, Birmingham, AL 35209, or email vet@progressivefarmer.com.
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