Mark Z. Johnson

Latest Stories
GAR bulls.
Beef Production
Do You Have Adequate Bull Power?
Every 21 days a cow stays open costs you roughly 40 lb. of weaning weight. Ensure your bull-to-female ratios are optimized to maximize early conception and your bottom line.
April 09, 2026 08:30 AM
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Mark Z. Johnson
BT_Calving
Education
Is 283 Days the Accurate Average Gestation Length?
Oklahoma State’s Mark Johnson shares research determining the average gestation for Bos Taurus beef cows.
February 26, 2026 12:33 PM
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Mark Z. Johnson
Angus Bulls
Beef Production
What is a Good Bull Worth in 2026?
Oklahoma State’s Mark Johnson breaks down the value of a bull in today’s market.
January 05, 2026 11:52 AM
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Mark Z. Johnson
CommercialCows_9178.jpg
Beef Production
Building Back Better: The Next Generation of Your Cow Herd
Identifying breeding goals as well as prudent selection and mating decisions can result in a cow herd that yields more beef per acre of pasture, reduces your maintenance cost and serves as the production factory of market topping calves.
December 30, 2025 08:40 AM
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Mark Z. Johnson
Red Baldie RAA
Beef Production
Building Back Better Focused on Heritability and Heterosis
In regard to building back a better cow herd through sound, intentional selection and mating decisions, the single strongest argument for crossbreeding is the advantage in reproductive fitness and longevity of crossbred cows.
December 23, 2025 07:28 AM
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Mark Z. Johnson
BT_Replacement_Heifers_Snow_Winter
Beef Production
Building Back Better With Mating Decisions and Gene Combination Value
Oklahoma State’s Mark Johnson explains hybrid vigor is the result of GCV.
December 17, 2025 05:00 AM
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Mark Z. Johnson
Heifers
Beef Production
Building Back Better Using Selection Decisions and Breeding Values
Oklahoma State’s Mark Johnson explains replacement heifer selection strategies based on genetic potential.
December 10, 2025 06:00 AM
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Mark Z. Johnson
Replacement heifers during the winter in a pasture.
Beef Production
Building Back Better: Better Genotype Through Selection and Mating
Oklahoma State’s Mark Johnson shares four tips for building better genotypes when selecting replacement heifers.
December 05, 2025 06:48 AM
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Mark Z. Johnson
Black baldy on pasture in Oklahoma.
Beef Production
Building Back Better by Analyzing Your System
Oklahoma State’s Mark Johnson explains the importance of understanding your production system when making breeding and selection decisions.
November 25, 2025 08:29 AM
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Mark Z. Johnson
BT_Replacement_Heifers
Beef Production
Building Back Better Using Breeding Objectives and Selection Pressure
Oklahoma State’s Mark Johnson shares how selection decisions impact cow herd productivity and profit.
November 19, 2025 06:13 AM
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Mark Z. Johnson
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