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Home » Authors » Randie Culbertson
Randie Culbertson

Randie Culbertson

Cow-Calf Extension Specialist / Iowa State University
Email Randie Culbertson
Articles

ARTICLES

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Factors influencing genetic improvement for reproduction

When considering what genetic traits to select for, cow-calf producers should consider how valuable longevity and reproductive efficiency are for their operations.
May 29, 2025
Randie Culbertson

With reproductive success estimated to be three to nine times more influential on operational profitability compared to other production traits, it makes sense that we would provide the best opportunities to maximize the number of cows we are able to get pregnant.


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Choosing the best bull for your operation and environment

Genetic improvement looks different on different operations, and the surest way to achieve it is to develop a breeding plan and understand your environment before choosing a bull.
February 21, 2024
Randie Culbertson and Patrick Wall

When selecting a bull, you want a bull who will add value to your operation, but the bull and his progeny must also be able to survive and thrive in the environment within your fences. So how do you choose the right bull?


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The ongoing debate over EPD vs. phenotype

The value of genotypic and phenotypic data can only be measured when viewed through the proper lens. Breeding bulls and replacement heifers should not be judged the same way market calves are.
December 1, 2023
Randie Culbertson

Using an EPD versus an animal’s phenotype is an ongoing debate among cattlemen. The question really boils down to whether the animal’s actual performance or the performance of its offspring is your primary interest.


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Simple inheritance, genetic defects and DNA testing

Gaining a basic understanding of how genes are inherited and expressed can work wonders for the producer wondering how genetic testing can help his or her operation.
July 24, 2023
Randie Culbertson

I recently had a conversation with a gentleman contemplating purchasing a bull who was concerned that the prospective bull may be a carrier for a genetic defect. This led to a conversation on simply inherited traits and how DNA testing plays a big role in selecting against genetic defects.


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What are indexes, and when should you use them?

When selecting breeding stock, producers often ignore information such as $ Index value simply because they don’t understand the data. When used in concert with EPDs, these indexes can help determine different animals’ true reproductive value.
February 7, 2023
Randie Culbertson and Patrick Wall

In bull selection, indexes and EPDs are often used as an either/or type of question: “Do I use indexes when I select bulls, or do I stick with EPDs because our operation focuses on _____?” Without a doubt, the answer is always: “Use both.”


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