EnergiLass Rumen Booster

EnergiLass Rumen Booster is a supplement for stressed cattle in the feedlot or on pasture; for cows before and during the breeding season.

  • Life Stage:  Breeder, Cow/Calf, Dairy Beef
  • Feed Type:  Low-Moisture Block
  • Feed Form:  Block
  • Packaging:  33.3-lb block, 250-lb block

Product Description

EnergiLass Rumen Booster is formulated for preconditioning, stressed, shipped-in feeder cattle, or cattle in sick pens on tall types of rations. Rumen Booster 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.

Yeast products

Yeast products have beneficial effects on intake, rumen function, and overall gut health.

Trace mineral amino acid complexes

Trace mineral amino acid complexes are more bioavailable compared to inorganic trace minerals.

Trace minerals and vitamins

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

Container options

Also available in 33.3 lb and 50 lb containers. Availability varies by plant.

Why are Kent products included on this website?

Since 1927, Kent has been a leading commercial livestock nutrition brand in the Midwest. In 2010, Kent and Blue Seal merged to form Kent Nutrition Group. Because of its strong quality nutrition reputation, select Kent brand products are proudly sold through Blue Seal retailers.

Visit the Kent website.

Nutritional Information

Guaranteed Analysis
Crude Protein, min 14.00%
Crude Fat, min 5.00%
Crude Fiber, max 2.00%
Calcium, min 1.50%
Calcium, max 2.00%
Phosphorus, min 2.00%
Salt, min 4.50%
Salt, max 5.50%
Magnesium, min 0.20%
Potassium, min 2.00%
Cobalt, min 13 ppm
Copper, min 510 ppm
Iodine, min 25 ppm
Manganese, min 1,400 ppm
Selenium, min 8 ppm
Zinc min 1,700 ppm
Vitamin A, min 200,000 IU/lb
Vitamin D3, min 20,000 IU/lb
Vitamin E, min 800 IU/lb
Thiamine, min 95 mg/lb


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

Feeding Directions

Feed Kent EnergiLass Rumen Booster to stressed or shipped in feeder cattle, or cattle in sick pens on all types of rations. Begin feeding to breeding cattle 30 days prior to and throughout the breeding season. Place barrel(s) in a dry location near the animal's source of water or loafing area. Consumption will vary depending on animal size; health; quality, source, and availability of roughage and/or grains; number of animals per barrel and barrel location. Offer one 250 lb barrel to every 10 head when cattle are stressed and one for every 30 head when cattle are healthy. Cattle typically consumer between 0.25 and 0.75 lbs per head daily.
Daily intake values are approximate. To increase consumption, decrease the number of animals per barrel. To reduce consumption, increase the number of animals per barrel, or place barrels away from the normal loafing area.

Provide clean, fresh water at all times. DO NOT feed free-choice salt and/or minerals, provide these in the regular ration.


This product, which contains added copper, should not be fed to sheep or any species with a low tolerance to supplemental copper.


Use as directed. Consumption of selenium should not exceed 3 mg per head per day.

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