Specifications of Rodent Diet


For the NIH #31M Rodent Diet

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.

Formulation for the NIH #31M Rodent Diet
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

The NIH #31M Diet Vitamin Premix, Added per 2,000 Pounds of Diet
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  

The NIH #31M Diet Mineral Premix, Added per 2,000 Pounds of Diet
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

Guaranteed Analysis
Crude protein minimum 18.0%
Crude fat minimum 5.3%
Crude fiber maximum 4.5%
Ash maximum 8.0%

Calculated Microanalysis
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
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
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

Taconic has the NIH #31M Rodent Diet available for sale in the US. The finished product is made into oval shape pellets (5/8″ - 3/4″) wide; (3/8″ - 7/16″) thick; and (1 - 1 3/8″) long. Pelleting is accomplished by using conventional steam pelleting techniques routinely used in the feed manufacturing industry. The finished product is packaged in three (3) ply laminated paper bags, 30 lbs. per bag. The bags are closed by sewing and they are of a quality that will withstand the temperatures associated with steam sterilization of the diet without bursting open.

To Order NIH #31M Rodent Diet Contact the US Customer Service Departments at:
518-697-3915 (toll free at 888-822-6642)
e-mail: custserv@taconic.com