The natural ingredient NIH #31M Rodent Diet is used as the standard diet in rodent production colonies at all US Taconic production sites. This diet formulation is a modification of the widely used NIH #31M Rodent Diet with the energy concentration increased by slightly increasing the percentage of soybean oil in the formulation. This is an open formula diet and the quantitative ingredient composition is presented in the table below.

Vendors providing the NIH #31M Rodent Diet to Taconic are required to provide a record of the amount of each ingredient used to manufacture every batch of feed shipped to Taconic. Vendors also provide the results of a proximate analyses conducted on a representative feed sample collected from the shipment. This information is used to document the quality of feed provided by the manufacturer. In addition, representative feed samples are periodically collected at Taconic and sent to an independent laboratory to be assayed for various vitamins, minerals, heavy metals, and chemical contaminants.

Ingredient Percentage by Weight
Ground whole wheat 35.17
Ground whole yellow corn 20.00
Ground whole oats 10.00
Wheat middlings 10.00
Fish meal (60% protein) 9.00
Soybean meal (47.5% protein) 5.00
Soy bean oil (no additives) 2.50
Alfalfa meal (17% protein) 2.00
Corn gluten meal (60% protein) 2.00
Dicalcium phosphate 1.50
Brewer’s dried yeast 1.00
Ground limestone 0.50
Salt 0.50
NIH #31 vitamin premix 0.25
NIH #31 mineral premix 0.25
Choline chloride 0.13
L-lysine 0.10
DL-methionine 0.10
Vitamin Amount Source
Vitamin A 22,000,000 IU Stabilized Vitamin A Palmitate or Acetate
Vitamin D3 3,800,000 IU D-Activated animal sterol
Vitamin K 20.0 g Menadione activity
dl alpha Tocopherol Acetate 15.0 g  
Biotin 120.0 mg d-Biotin
Folic acid 1.0 g  
Niacin 20.0 g  
Pantothenic acid 25.0 g d-Calcium pantothenate
Pyridoxine 2.0 g Pyridoxine hydrochloride
Riboflavin supplement 5.0 g  
Thiamine 65.0 g Thiamine mononitrate
Vitamin B12 supplement 14,000.0 mcg  
Mineral Amount Source
Cobalt 0.4 g Cobalt Carbonate
Copper 4.0 g Copper Sulfate
Iron 60.0 g Iron sulfate
Magnesium 400.0 g Magnesium oxide
Manganese 100.0 g Manganese oxide
Zinc 10.0 g Zinc oxide
Iodine 1.5 g Calcium iodate
Crude protein minimum 18.0%
Crude fat minimum 5.3%
Crude fiber maximum 4.5%
Ash maximum 8.0%
Amino acids % of Total Diet
Arginine 1.00
Lysine .96
Methionine .46
Cystine .26
Tryptophan .20
Glycine .90
Histidine .42
Leucine 1.47
Isoleucine .79
Phenylalanine .82
Tyrosine .64
Threonine .66
Valine .90
Minerals Amount
Calcium 1.12%
Phosphorous .96%
Potassium .60%
Sodium .28%
Magnesium .22%
Iron 206 mg/kg
Zinc 58 mg/kg
Manganese 150 mg/kg
Copper 17 mg/kg
Cobalt 0.8 mg/kg
Iodine 1.9 mg/kg
Vitamins Amount
Vitamin A 26 IU/gm
Vitamin D 4 IU/gm
Alpha-Tocopherol acetate 50 mg/kg
Thiamine 76 mg/kg
Riboflavin 7.6 mg/kg
Niacin 83 mg/kg
Pantothenic acid 34 mg/kg
Choline 1910 mg/kg
Pyridoxine 11 mg/kg
Folic acid 1.7 mg/kg
Biotin .25 mg/kg
Vitamin B 12 56 mcg/kg
Vitamin K 20 mg/kg
Calories provided by: Amount
Protein 20.940%
Fat (ether extract) 13.736%
Carbohydrates 65.324%