EnergiLass Rumen Booster AFC


A nutritional supplement containing S-methoprene insect growth regulator for continuous feeding to cattle through the horn fly season.

  • Packaging:  250-lb Tub
  • Life Stage:  Breeder, Cow/Calf, Dairy Beef
  • Feed Type:  Low-Moisture Block
  • Feed Form:  Block

Product Description

EnergiLass Rumen Booster AFC is formulated for preconditioning, stressed, shipped-in feeder cattle, or cattle in sick pens on tall types of rations. Rumen Booster AFC can also be offered to cows and heifers during the breeding season, to dairy calves at weaning and stressed dairy cows.

Features & Benefits

High energy

Molasses and added fat results in a very high level of sugar and energy. This high sugar level and the licking action needed for consumption increase saliva production. This, in turn, may improve the rumen environment which could improve forage digestion.

Highly palatable

The high level of molasses solids and fat make for a highly palatable product. The licking action along with saliva produced softens the top 1/4 inch of the block allowing limited consumption. When this thin layer is consumed the animals must wait for the next layer of the block to soften before they can consume additional product.

Continuous Protein Delivery

As pastures mature, forage quality can decline. Supplementing with protein allows the rumen to better digest mature forages.

Thiamine and B Vitamins

Thiamine and B Vitamins are known to stimulate intake of cattle under stress.

Added Salt

Salt encourages supplement and water intake, both important in stressed calves. Also helps maintain electrolyte balance.

Complexed trace minerals

Complexed trace minerals to improve trace mineral availability and utilization.

Trace minerals and vitamins

Formulated to provide trace minerals and vitamins to help support optimal animal health and performance.

Altosid Fly Control

Horn flies cost the cattle industry billions each year in lost milk production, lost calf gains, and lost cow performance. An integrated fly control program, including Altosid, can keep horn fly populations at bay.

Nutritional Information

Guaranteed Analysis
Crude Protein, min14.00%
Crude Fat, min5.00%
Crude Fiber, max2.00%
Calcium, min1.80%
Calcium, max2.30%
Phosphorus, min2.00%
Salt, min4.50%
Salt, max5.50%
Magnesium, min0.20%
Potassium, min2.00%
Cobalt, min4.5 ppm
Copper, min510 ppm
Iodine, min25 ppm
Manganese, min1,400 ppm
Selenium, min8.0 ppm
Zinc min1,700 ppm
Vitamin A, min200,000 IU/lb
Vitamin D3, min20,000 IU/lb
Vitamin E, min800 IU/lb
Thiamine, min95 mg/lb


Molasses Products, Plant Protein Products, Monocalcium Phosphate, Dicalcium Phosphate, Hydrolyzed Vegetable Oil, Salt, Processed Grain By-Products, Calcium Carbonate, Magnesium Oxide, Copper Sulfate, Zinc Sulfate, Manganese Sulfate, Ethylenediamine Dihydroiodide, Calcium Iodate, Cobalt Carbonate, Vitamin A Supplement, Vitamin D-3 Supplement, Vitamin E Supplement, Thiamine Monotitrate, Manganese Amino Acid Complex, Selenium Yeast, Sodium Selenite, Zinc Methionine Complex, Copper Amino Acid Complex, Vitamin B-12 Supplement, Riboflavin Supplement, Niacin Supplement, Pantothenic Acid, Choline Chloride, Menadione Sodium Bisulfite Complex and Mineral Oil.

Active Drug IngredientAmount

Feeding Directions

It is a violation of Federal Law to use this product in a manner inconsistent with its labeling.

FEEDING AND MANAGEMENT INSTRUCTIONS: When used as directed, ENERGILASS Rumen Booster AFC block will provide sufficient (S)-methoprene insect growth regulator to prevent the emergence of adult horn flies from manure of treated cattle. Existing adult horn flies will not be affected. Start feeding before horn flies appear and continue use until cold weather marks the end of the horn fly season. Allow free choice to cattle. Cattle should consume an average of 0.8 ounces of ENERGILASS Rumen Booster AFC block per 100 lbs. of animal body weight per day, which is equivalent to 8 ounces per day for a 1,000 pound animal.

  1. Assure cattle are not starved for nutrients prior to feeding ENERGILASS Rumen Booster AFC block.
  2. Offer cattle 250 pounds of ENERGILASS Rumen Booster AFC block for every 15-25 head of cattle.
  3. Remove all other self limiting nutritional supplements.
  4. Locate ENERGILASS Rumen Booster AFC block where cattle congregate (watering, loafing, shade areas).
  5. Replenish ENERGILASS Rumen Booster AFC block on a regular basis as needed.
  6. If intake of ENERGILASS Rumen Booster AFC block is below 0.8 ounces per 100 pounds animal body weight per day, increase the number of feeding locations and/or change location(s) to areas more frequented by cattle.
  7. If intake of ENERGILASS Rumen Booster AFC block is above 0.8 ounces per 100 pounds animal body weight per day, reduce the number of feeding locations and/or change location(s) to areas less frequented by cattle.
  8. Introduction of this product after adult horn fly infestation is established will require treatment of cattle


CAUTION KEEP OUT OF REACH OF CHILDREN CAUTION: This product contains high levels of copper. Consumption of this product by sheep or goats may result in copper toxicity.


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