Pregnancy Diagnosis Methods

Knowing which cows are bred, and roughly when they will calve, lets you cull open cows, group the herd and plan feed. The method you pick depends on your needs and your vet.

Key points

Pregnancy checks help you cull open cows and plan feed and calving groups.
Palpation, ultrasound and blood tests each have strengths.
Timing affects accuracy, so ask your vet.
Good records and safe facilities make the work efficient.
Follow withdrawal times on any treated cow before sale.

Why check at all

An open cow eats as much as a bred one and gives no calf. Finding open cows early lets you sell or rebreed them while their value is highest. Checking also shows how well your breeding season worked and helps you plan feed by calving group.

Pregnancy diagnosis also feeds your records. Open rates across years show whether fertility, bulls or nutrition need attention.

A pregnancy check can also catch problems such as fetal loss, which helps you decide whether to rebreed or cull.

Rectal palpation

Rectal palpation is a long-standing method in which a trained person feels the reproductive tract through the rectum to determine pregnancy and estimate how far along the cow is. It needs skill and experience, and it should be done by a veterinarian or a trained person with proper protective gear.

It can be fast in a good chute and it gives an estimate of stage. Accuracy depends on the operator and the time since breeding, so ask your vet when the earliest reliable check is.

Needs a trained person and a sound restraint
Provides an estimate of stage of pregnancy
Accuracy depends on skill and timing
Handle cows quietly to protect animals and people

Ultrasound

Ultrasound uses sound waves to create an image of the uterus and, in many cases, the fetus. It can detect pregnancy earlier than palpation in many hands and can estimate fetal age and sometimes sex, depending on timing and the operator.

It requires equipment and training. Many veterinarians use it routinely, and it lets you see what is happening, such as twins or an abnormal pregnancy.

Veterinarians who use ultrasound can sometimes spot twins or problems early, which matters for feed planning and calving help.

Blood and other lab tests

Some laboratory tests use a blood sample to look for pregnancy-associated proteins. They are convenient in that the sample can be collected and sent to a lab, and no one needs to reach into the cow.

Results depend on the cow being past a certain interval after calving and after breeding, so follow the lab's instructions and ask your vet. These tests tell you pregnant or open, not stage. Handling and labeling errors can cause wrong results, so identify samples carefully.

Pregnant or open result, not stage
Follow the lab's timing rules
Label samples carefully
Ask your vet about what to do with unclear results

Choosing a method and a time

Match the method to your goal. If you want to know stage, palpation or ultrasound fit. If you want a quick open or pregnant call on a large herd, a blood test may suit. You may combine methods.

Time your check so cows are far enough along to read reliably and early enough to sell open cows or rebreed them. Ask your veterinarian to help set a date after the end of the breeding season.

Some herds check once at the end of the breeding season and again later in the year to find cows that lost a pregnancy, and the vet can tell you if that fits your operation.

Planning the work day

Gather and sort quietly, keep animals out of the heat and have clean, working facilities with a good headgate. Have records ready, including cow ID, bull group, breeding dates and treatments, and write results beside each cow.

Keep people safe. Use well-maintained chutes, follow manufacturer, OSHA and extension guidance, and never put hands or arms where a cow can crush them. Withdrawal times for any treated cattle must be followed exactly before sale.

Mark each cow clearly after the check, such as with a paint stick or a tag record, so sorting is easy and mistakes are rare.

Common mistakes and what to ask

Mistakes include checking too early, not recording stage, mixing up sample IDs and keeping open cows because of a good past.

Ask your vet: What method fits my herd? When is the earliest reliable check? What do we do with questionable results? Ask your buyer or sale barn what they require for bred cow sales, since rules vary.

When to get help: Schedule pregnancy checks with your veterinarian and ask which method fits your herd and timing. If you sell bred cows, confirm requirements with your buyer, and ask your extension office about herd record systems.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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