One of the questions veterinarians are helping cow/calf producers answer is whether it’s a better decision to raise their own calves or buy them.

There’s no single, right answer to whether producers will benefit most from raising their own heifers or buying bred ones.

Given the price of replacement beef heifers today, one of the questions veterinarians are helping cow/calf producers address is whether it’s a better decision to raise their own calves for replacements or buy them.

The answer, like with many complex decisions, isn’t a simple yes or no, according to Dr. Ray Stegeman.

The Missouri veterinarian says he has cow/calf producers who do raise their own replacements, but it’s not a practice he recommends for everyone.

“I work with quite a few smaller family farmers who keep heifers and are successful with that. But they know the mama cows and everything about them going back 50 years, which has merit,” says Stegeman, who owns Osage Veterinary Clinic in St. Thomas, Mo., and is a member of the Production Animal Consultation (PAC) network. “But if a producer is just starting out, it’s often advisable to buy bred heifers, given the economics of developing a heifer and the time involved.”

Stegeman, referencing research at Texas A&M and University of Nebraska, says a 200-cow herd size is often a practical starting point for deciding whether buying or raising replacement heifers is the better option.¹

Size Of Calf Crop And Resources

There are several reasons why a 200-head cowherd is a good minimum threshold. For one thing, there’s a large enough calf crop born to provide an adequate number of high-quality prospects for the farm. Three other considerations: this size of operation often has adequate manpower, physical facilities and land necessary to make the undertaking feasible and worthwhile.

“I think we tend to overlook or not realize the costs and resources that go into developing a replacement heifer,” Stegeman explains. “For example, you need to have enough pasture available, you have to keep a bull away from these heifers and raise them separate from the cowherd, and that takes additional resources.”

Here are seven additional factors Stegeman, other veterinarians and beef Extension specialists take into consideration as they work with cow/calf producers who are raising their own replacement heifers.

1. Monitor calves early. Stegeman advises his producers to start looking at their prospects during preweaning, managing nutrition proactively to prevent underfeeding or overfeeding.

“Everyone wants to pick a good-looking heifer, but you don’t want the heifer still on the mother cow to get too fat,” he says. “If we’re creep feeding, we want to watch our starch. If that heifer is too fat at weaning that in and of itself can be a setback.”

Heifer calves that are too fat have been shown to have reduced milking ability once mature, according to Oklahoma State University Extension research. Mammary development is in a critical stage from 2 months of age until about 9 months, or just before puberty.² If a calf is storing considerable amounts of extra fat during that time, excessive fat can be deposited in the mammary gland and inhibit its development.

Stegeman adds if the calf has too much body fat that has the potential to cover up physical defects, which might only be discovered after the producer decides to retain the calf.

In addition, Stegeman likes to talk with producers about nutrition and environmental factors the dam experienced while carrying the calf. He considers whether the mother cows were subjected to drought conditions or inadequate nutrition or other environmental factors.

“Fetal programming factors can result in potential negative productivity in the heifer calf following it through to maturity,” he tells Bovine Veterinarian.

2. Heifer calves born earliest are usually the top picks. Older heifers are more likely to reach the desired target weights by the start of breeding. Early puberty is moderately to highly heritable and positively related to future reproductive efficiency.

“Fertility is driven by genetics, so much so that it’s very important to pick those heifers born early in the calving season as replacements” Stegeman says.

During the selection process, producers with their veterinarian’s help, should look for heifers that are structurally sound, have a wider structural frame and a body type of more rib shape and depth, recommends Mark Z. Johnson, Oklahoma State University Extension beef cattle breeding specialist.³

Johnson adds thatfleshing ease equates to breeding females that can better maintain body condition and energy reserves on a given amount of feed.

3. Consider genetic merit. Genetics are an important consideration, as producers plan the type of heifers they want to raise and keep and the traits needed to meet their goals.

“I think one of the problems with the beef industry today is that we’re choosing heifers from the steer pool of genetics – we’re choosing heifers out of carcass genetics,” he says. “There’s opportunity in the beef industry to have maternal herds producing genetically superior replacement females for cow/calf operations to purchase, which will be important going forward.”

4. Put prospective replacements on pasture, once they’re weaned. “We like to develop heifers on the pasture that they’re going to see as an adult cow,” Stegeman says. “They essentially program themselves, and after they calve the first time, they’ll perform better and stay in the herd. Don’t push them too hard with grain,” he cautions. “Go for the pound and a half to 2 pounds of gain per day.”

5. Don’t overlook the importance of temperament. A heifer can look like a great fit for the farm but still be an animal the producer needs to cull, because of her attitude and behavior.

Mississippi State Extension beef specialists encourage producers and their veterinarians to use a chute scoring method to keep temperament records.⁴ When heifers are restrained in the working chute, they can be assigned a score from 1 to 4 (1 = calm; 2 = restless shifting; 3 = squirming; 4 = twisting and rearing). Temperament is a very heritable trait, and removing temperamental heifers from the herd improves safety for farm employees as well as other members of the cowherd.

6. Protocols are needed for heifer vaccinations and deworming. For replacement heifers, Stegeman recommends administering a modified live viral vaccination and an initial leptospirosis vaccine at weaning time, when the animal is 6 to 7 months old.

“We’ll then deworm, often with a combination product, at that time as well,” he says.

Once heifers reach the 12-month mark, they are then administered a second round of vaccinations and dewormer.

“With some of the longer synchronization protocols now, we can give them their last pre-breeding vaccination the day we set them up, as it is approximately 33 days to breed from day one to AI or bull turn out,” Stegeman says. “Often, to save on number of trips through the chute, we try to consolidate processing.”

7. A pre-breeding examination is good insurance. Stegeman recommends that veterinarians reproductive tract score the heifers, either via ultrasound or manual palpation, at around 45 days prior to breeding. He says to measure the pelvis to make sure it is at least 150 square centimeters in size.

“We don’t want to set that number too high. We don’t want to say, ‘Well, my heifers need to be at 180 square centimeters,’ because then we’re just selecting for a big cow,” says Stegeman, citing research by David Patterson, PhD, emeritus beef Extension specialist at the University of Missouri.

With tract scores, Stegeman looks for scores of four and five, which indicate the heifer is ready to breed.

“We can start them on synchronization for breeding,” he says. “If needed, with some of the twos and threes, we’ll put them on feed to hopefully increase their tract score. Research indicates it takes at least 20 days to increase the tract score. If we have enough of the lower scoring heifers, and we deem it necessary, we can sort them out from the fours and fives to bump up their tract score using increased feed,” Stegeman adds.

He notes that the reproductive tract score along with the pelvic measurement provides the producer with some insurance that he is hanging on to the ‘right’ versus the ‘wrong’ heifers.

“The veterinarian can save producers money and time with these practices,” Stegeman says. “If you wait until preg check time to cull those heifers that’s not a good decision for the producer, because he’s got all the extra expense and feed into them up until that time. You might as well put them in the feedlot or develop them out for feeding earlier in the process,” he says.

¹DocTalk, Thomson, Dan. DocTalk Ep 462 – Heifer Development with Dr. Ray Stegeman

²Selk, Glenn. Development of Replacement Beef Heifers. http://agecon.okstate.edu/cattleman/files/ch_21_6th_ed.pdf

³Johnson, Mark Z. Selection of Replacement Heifers. https://extension.okstate.edu/programs/beef-extension/cow-calf-corner-the-newsletter-archives/2024/february-26-2024.html

⁴Rhinehart, Justin D. and Parish, Jane A. Replacement Beef Heifer Development. NRC, 2000. Adapted from NRC Nutrient Requirements of Beef Cattle, 7th revised edition. https://extension.msstate.edu/publications/publications/replacement-beef-heifer-development

Source: DROVERS Rhonda Brooks, December 02, 2024

Photo: FarmJournal