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Fall processing is usually the last hands-on window before winter. Vaccine decisions, parasite control, implant strategy, and recordkeeping all land on one day of work, and a missing needle size or an unassigned role can cost you hours.
Most of this checklist comes due before cattle are ever penned.
When | What gets done |
2 weeks out | Confirm vaccine, dewormer, and implant plans with your veterinarian. Order product. Check shelf inventory against the plan. This is also the outer edge of the window for a first respiratory dose ahead of weaning. |
1 week out | Test the chute and headgate. Check the implant gun and every syringe. Restock needles. Line up crew. |
Day before | Stage product at the chute. Walk the crew through the plan. Check the forecast. |
Processing day | Execution only. |
Tip: Print the protocol and keep a copy at the chute. When the pace picks up, a written sequence is what keeps product from getting skipped or doubled.
Assign roles before gathering day: chute operator, injection giver, data recorder, gate crew. Set the product order too, so nothing gets administered twice or is missed.
Have a Plan B. Weather turns, headgates break, and help doesn’t show up. Knowing in advance which of those you can work around is worth 5 minutes of thinking ahead.
BQA guidelines call for all injections, including antibiotics, vaccines, parasiticides, vitamins, and hormones, to be given in front of the slope of the shoulder in the triangular mass of neck muscle. For products labeled intramuscular, BQA allows no exceptions regardless of the animal’s age.
Where the label allows either route, choose subcutaneous. SQ injections are the least likely to cause an adverse tissue reaction, and any scar tissue that forms sits outside the muscle, where it comes off with the hide instead of getting trimmed from a saleable cut.
BQA caps IM injections at 10 cc per site and calls for sites at least 4 inches apart, about a hand’s width. Use the tenting technique for subcutaneous injections: pull the skin away from the neck and insert at roughly a 45-degree angle, so the needle stays in the gap rather than reaching muscle. Change needles regularly, discarding any that are burred or bent.
⚠ Route changes carry a hidden cost. Giving a product by any route other than what the label specifies is extralabel drug use. The label withdrawal time stops applying, and a veterinarian working within a valid client-patient relationship has to set a substantially extended time before those cattle can be marketed. Map which product goes where before gathering day.
Fall priorities generally center on respiratory and clostridial protection, especially for calves headed to a stocker or feedlot situation where commingling and transport stress are ahead of them.
Immunity takes time to build, which is why weaning, vaccinating, and hauling on the same day tends to undercut all 3. Give the first respiratory dose 2 to 4 weeks before weaning, while the calf is still on the cow. Follow the label for the booster interval, commonly 3 to 4 weeks, and set the calendar so the final dose lands at least 2 weeks ahead of weaning day.
Handling matters as much as timing. Store biologicals as the label directs, typically 35°F to 45°F. Freezing is particularly hard on killed vaccines because it alters the adjuvant or delivery system. And once a modified-live vaccine is reconstituted, mix only what you can use in an hour. BQA is explicit that MLV products must be used when mixed and can’t be stored for later.
⚠ Your refrigerator is the weak link. Research from the University of Arkansas and Idaho found only about a quarter to a third of on-farm refrigerators held acceptable vaccine temperatures 95% of the time. Some ran too warm, some too cold. An inexpensive min/max thermometer will tell you which one you have. Months of bad storage happen long before the cooler comes out.
Brown stomach worm (Ostertagia ostertagi) is what makes this pass worth doing. Larvae picked up late in the grazing season don’t all mature. Some burrow into the wall of the abomasum and shut down for months, and cattle carry thousands of them without a single egg showing in a fecal sample.
Then they wake at once. That’s Type II ostertagiosis: watery diarrhea, rapid weight loss, and the fluid swelling under the jaw producers call bottle jaw. Type I is common and rarely kills. Type II is uncommon and does.
It hits cattle 12 to 20 months old in their second grazing season hardest. Resistance builds with age, so the return concentrates in weaned calves, yearlings, and replacements. Bulls stay susceptible whatever their age. Time the pass after cattle come off pasture, or after the first killing frost where they graze through.
Albendazole (Valbazen) and oxfendazole (Synanthic) carry FDA label claims against inhibited 4th-stage Ostertagia. Fenbendazole does too, but only in beef cattle at the double 4.6 mg/lb rate labeled for Type II. At the routine 2.3 mg/lb rate the claim covers adult worms only. The dose decides what you’re buying.
Field performance runs behind the label anyway. In a western U.S. trial, oxfendazole reduced developing 4th-stage Ostertagia by 82.1% and ivermectin by 71.9%, both under the 90% threshold, while fenbendazole reached 97.9%.
Route matters too. Pour-ons offer convenience and ease of application, but get compromised by rain, rubbing, and licking. Feed and mineral give little dose control, since the boss cow takes a double and the tail-ender none. For targeted, individual dose control, injectables or oral drenches are the gold standard because every animal gets an exact weight-based dose delivered directly.
A 2025 study of 12 Georgia cow-calf farms found avermectin resistance in at least 1 worm species on every farm tested with eprinomectin, and on 9 of 12 tested with injectable doramectin. Mean fecal egg count reduction was 61.8% and 66.9%, both well under the 90% floor. Doramectin plus fenbendazole worked on all 12 farms, averaging 98.75%.
Switching to another product in the same family is a weak fix, since side resistance between ivermectin and moxidectin is a real risk. The specialists recommend pairing a macrocyclic lactone with a dewormer from a different class, given at the same time but kept in separate syringes.
Then confirm it worked. Arrested larvae shed no eggs, so a sample pulled in the wrong season reads clean over a big hidden burden. Test when cattle are actively shedding, and pull the post-treatment sample on schedule: 10 to 14 days for a benzimidazole, 14 to 17 for ivermectin, 17 to 21 for moxidectin. Below 90% means resistance is likely.
Benzimidazoles hit internal parasites only. Macrocyclic lactones cover lice, grubs, mange mites, and flies as well. Swap your endectocide out for a benzimidazole and you’ve opened a lice gap. Add one alongside it, which is what the resistance guidance calls for anyway, and you haven’t.
Timing compounds it. Nebraska Extension notes that fall temperatures above 78°F suppress louse development, because cattle skin temperature climbs past 100°F. Treat during a warm fall and there may be too few active lice for the product to reach. Then the weather turns and the population takes off. Heavy infestations, more than 10 lice per square inch, may cut calf gain by as much as 0.21 lb/day, so budget for a separate external parasite plan.
⚠ Grub timing carries a safety risk. Killing cattle grubs while they migrate through the esophagus or spinal canal can trigger a host-parasite reaction: drooling and bloat, or stiffness and hind-limb weakness. Nebraska Extension advises against systemic products from Nov. 1 to Feb. 1. Grub season tracks local climate, so confirm the window for your area with your veterinarian.
This runs against instinct, so here’s the logic. Every time you treat a whole group, the only worms left alive are the ones your product couldn’t kill, and those are the ones that seed the pasture. Leaving a few animals untreated keeps ordinary, still-killable worms in the mix so the survivors get diluted. Parasitologists call that untreated population refugia.
In practice: treat the high-risk group but skip the heaviest, best-performing 10% to 15%, who are getting the least benefit anyway. Mature cows are the other group to leave alone, and LSU’s Christine Navarre suggests treating only cattle under 5 years old.
The same reason you shouldn’t deworm a whole group and turn it straight onto clean pasture. The only eggs seeding that ground would come from the worms that survived.
Extension estimates commonly put implant returns at 10:1 or better under proper management, and Oklahoma State pegs stocker implants higher still, at more than $15 back per $1 spent. We covered the economics in why cattle implants pay. Four things decide whether you see that return.
Nutrition sets the ceiling. Response is smallest in suckling calves, roughly a 4% to 8% lift in average daily gain, and runs 10% to 20% in growing, stocker, and finishing cattle. Mississippi State puts a floor under it: calves need to be gaining at least 1.3 lb/day for an implant to improve growth. Implanting a calf you’re about to run on short winter forage buys a response he has no feed to produce.
Potency steps up. Follow each implant with one of equal or higher potency, and re-implant at the end of the labeled payout window. Oklahoma State’s Klemme Range data shows what stepping down costs: steers moved from a TBA/estradiol combination to a lower-potency estradiol/progesterone product gained 2.0 lb/day, behind the 2.4 of steers never re-implanted at all. Going early adds no gain and has been linked to prolapses.
Your marketing plan is a hard gate. NHTC and many branded programs require cattle that have never received a hormonal growth promotant, and packers palpate 100% of ears at slaughter. One implant disqualifies an animal for life. Minimum age is product-specific: Synovex-C at 45 days, Ralgro at 30. No implant is approved for bulls, so castrate at the time of implanting.
Replacement heifers need their own conversation. Florida and Nebraska advise against implanting retained heifers at all. New Mexico State allows a window of 1 to 3 months. Where everyone agrees: never in the first month, never after 3 months, and never a product without a label claim for breeding heifers. Heifers implanted twice with zeranol showed pregnancy rates 7.3 percentage points below untreated controls.
Placement is where returns get lost most often. The only FDA-approved location is the middle third of the back side of the ear, between skin and cartilage. Cartilage has no blood supply to absorb the product, and a severed vessel absorbs it too fast. Withdraw the needle slowly so the pellets stay whole.
Tip: Abscesses are mostly a sanitation problem. Anything on the ear travels in with the needle, so scrape off mud and manure, dry the site, disinfect between animals (chlorhexidine at 1 oz per gallon works, alcohol doesn’t), and skip wet ears. SDSU suggests auditing about 20 head 3 weeks later to check your technique.
Sustained stress suppresses immune function, and extension sources list it among the most common reasons vaccinated calves still fail to respond.
Work cattle with the flight zone and point of balance, move calmly, and keep the noise down. Getting hurried backfires: Mississippi State notes that going too fast raises injury risk and can reduce efficiency, and once cattle are excited it takes 20 to 30 minutes for them to settle.
BQA doesn’t ban electric prods, but it benchmarks them. Fewer than 10% of cattle should need one. Vocalization gets scored after the animal is caught and squeezed but before any procedure, and more than 5% bawling is a signal to look at how the chute is being run. When animals balk, check for backstops, chains, dogs, shadows, or people standing in the wrong place.
• Vaccines and dewormer, checked for storage temperature and expiration
• Correct needle gauges and lengths for each product and route, with spares
• Implant gun matched to the implant brand, tested ahead of time
• Disinfectant and a brush for implant sites and needles
• Cooler and ice packs, chilled down before you start
• Min/max thermometer for the vaccine refrigerator
• Ear tags, tagger, and permanent marker
• Chute and headgate check: keep high-wear replacement components on hand
• First-aid supplies for cattle and crew
• A printed copy of your protocol at the chute
Can I give a vaccine and a dewormer on the same day?
Usually yes, but check both labels for concurrent-use language and confirm with your veterinarian. Use separate syringes, give each product by its labeled route, and keep sites at least 4 inches apart.
How many weeks before weaning should I vaccinate calves?
Give the first respiratory dose 2 to 4 weeks before weaning, while the calf is still with the cow. Plan the booster off the label interval so the final dose lands at least 2 weeks before weaning day.
Do I still need to deworm cows in the fall if I dewormed in the spring?
Often not. Cattle build resistance to gastrointestinal worms as they age, so the return concentrates in weaned calves, yearlings, and replacements. Mature cows are frequently the right group to leave untreated.
What is a combination dewormer and do I need one?
Two dewormers from different chemical classes, given at the same time in separate syringes. Where avermectin resistance is established, combinations have restored control that single products lost. A fecal egg count reduction test on your own herd tells you whether you need one.
How many people do I need to work cattle?
Enough to cover 4 roles without doubling up: chute operator, injection giver, data recorder, and gate crew. The number matters less than assigning them before gathering day.
Will implanting hurt a heifer’s value as a replacement?
It can. Extension guidance ranges from avoiding implants in retained heifers entirely to allowing one between 1 and 3 months of age with a product labeled for breeding heifers. Implanting twice has been associated with lower pregnancy rates.
Confirm the plan with your veterinarian, order product early, and get the roles assigned while there’s still time to fix a gap.
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ALWAYS READ AND FOLLOW LABEL DIRECTIONS. This content is for informational purposes only and is not a substitute for professional veterinary advice. Consult your veterinarian on product selection, dosing, and withdrawal times for your operation. Product availability may vary by region. See FBN Direct for current product listings and pricing.
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Sources: BQA Field Guide 2025 | BQA Cow-Calf Assessor’s Guide | OSU: Use, Handling and Care of Vaccines | UMD: Weaning Tips and Vaccination Programs | UW-Madison: Vaccination to Improve Beef Calf Health | AVMA: Extralabel Drug Use FAQ | Merck: GI Parasites of Cattle | Merck: Anthelmintic Resistance | Edmonds et al., Veterinary Parasitology 170 (2010) | Sicalo Gianchini et al., Veterinary Parasitology 336 (2025) | UMD: Fecal Egg Count Reduction Testing (FS-1175) | UMD: Best Deworming Practices for Cattle | Navarre, AABP Proceedings (2019) | UT Extension: Controlling Internal Parasites | UNL BeefWatch: Fall Cattle Lice Treatments | Merck: Hypoderma spp | OSU AFS-3290: Implants in Beef Cattle Production | MSU: Growth-Promoting Implants for Beef Cattle | UGA B1302: Implanting Beef Cattle | NMSU B-218: Growth Implants in Suckling Beef Calves | SDSU: Getting Implant Application Correct | USDA FSIS: EU NHTC Program Requirements | MSU P2801: Beef Cattle Behavior and Handling