March 18, 2011
Certified Angus Beef (CAB) offers these four strategies to enable feeders to strike a balance between grade and gain, implant and marbling levels:
Delay implanting until full feed. “It’s almost become standard operating procedure around here,” says South Dakota State University’s (SDSU) Robbi Pritchard. His team divided 650-lb. steers into non-implanted, estradiol-trenbolone acetate (TBA) implant at the start, or TBA implant at 850 lbs.
“If you impede marbling on the front end, you may permanently affect quality grade,” Pritchard says of the work.
Implanting increased hot carcass weight under both strategies, but the delay resulted in a 15% increase in cattle reaching the premium Choice or higher.
SDSU now waits until final diet before implanting calves, and that increases average gains by 20%.
“If they’re eating enough to gain 4.5 lbs./day, that boost is 0.9 lb.,” Pritchard says. “When they’re only gaining 1.5 lbs./day, in their first week, it’s only a 0.15-lb. improvement. That’s when it pulls grade out of them: when the implant is going full-tilt and the calories aren’t there.”
Agri Beef Co. adopted the strategy at its four feedlots from Washington to Kansas to improve grade.
Scott Lindsay, Agri Beef livestock division president, says the increase in quality came without a significant impact on performance, but he was surprised by other benefits.
“We cut our number of bullers way back and cattle appeared to come on feed a lot better,” he says. “The cattle just didn’t seem to get as stressed, and we didn’t have to use as many meds.”
Trial and error says to do it when cattle are on full feed. “If we said we wanted to do it on day 20 and we were in between rations, it didn’t seem to work as well,” Lindsay says.
Less aggressive, better result. “Over-implanted cattle gain remarkably less than their lean gain potential,” Pritchard says. “If you want a set of cattle that aren’t going to grade, that’s the set to own.”
Colorado State University (CSU) research agrees. Meat scientist Daryl Tatum’s meta-analysis of 25 steer implant studies compared varying dosages to non-implanted cattle. Aggressive strategies netted only 1 lb. more gain than moderate doses, while dropping marbling score a total of 35 points.
“It appears moderate implants best balance growth and carcass quality grade,” he says.
A recent Kansas State University analysis by Chris Reinhardt backs that up.
“There is a fairly linear depression in marbling score with increasing dose of implant,” he says. Going from low-dose to moderate implant yields a performance boost, but jumping from a moderately-high to the most aggressive level doesn’t deliver as much punch compared to loss in quality grade.
Repetition matters, but fewer not always best. What’s the top factor in both performance and marbling score? “Total dosage of hormone used,” Reinhardt says.
Splitting a high-dose implant may beat giving it all at once, especially if that’s on arrival. “That would fly in the face of the theory that one implant is better than two for marbling score,” he admits.
For support, an SDSU trial compared cattle given a six-pellet implant on Day 1 to those given a two-pellet implant every 40 days.
“You’ll end up with the same performance and you don’t do as much damage to quality grade by spreading it out,” Pritchard says. Although that’s probably an extreme example, splitting an implant is doable.
A 2005 CAB LLC analysis looked at the effect number of implants had on brand acceptance rates. Going from none to one dropped CAB qualifiers from 37% to 19.1%, but those with two implants actually had a higher rate at 21.2%. Cattle implanted three times, however, were the lowest graders at 16.7% CAB.
“Most feedlot will give two implants, and that’s fine if the one on the front end is a lower dose like a Revelor-IS® or Component-TE-IS®,” says Gary Fike, CAB beef cattle specialist.
Fit it to nutrition, type. “Going for quality grade, the most important thing is to never have an implant dosage that exceeds what the caloric intake can support at any stage of production,” Pritchard says.
That’s why many feeders say their better cattle aren’t hurt as much by a higher potency implant.
“If those cattle are eating well and charging the feedbunk every day, and you’re giving them calories well in excess of maintenance, that leaves plenty of calories to help them grow and deposit marbling,” Fike says.
The most aggressive strategy should be reserved for small-frame, slow-growing cattle, he adds.
“As you increase aggressiveness of implant, you’ll increase frame size,” Pritchard says. “An overweight is a horrific penalty, so you’ll want to decrease potency if you’re looking at that limit.”
These rules of thumb come down to balance. “We don’t use a high-dose implant,” Lindsay says. “We know we have to be competitive, but the end product to the consumer is very important to us.”
That’s as it should be, Tatum says. “Great taste remains the primary reason consumers often make beef their food of choice,” he says. “The goal is to take advantage of the benefits of growth enhancement without detriment to beef demand.”
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