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Animal Sciences and Industry

Animal Sciences and Industry

Kansas State University
232 Weber Hall
Manhattan, KS 66506-8028

785-532-6533

Email: asi@ksu.edu

Feed analysis

The decision on which analyses to perform depends on the individual ingredient and the intended use of the results for either purchasing or diet formulation. In general, analysis of ingredients and feeds often comprises: dry matter (DM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), lysine, calcium, and phosphorus. For analysis of highly variable nutrients like calcium, it is recommended to submit multiple samples for analysis and to analyze samples in duplicates (Jones et al., 2018). 

Specific analysis for fat and oil quality or mycotoxin concentration should also be considered in some situations.

A list of commercial laboratories performing analyses of complete feeds and feed ingredients and is shown in List 1.

List 1. Commercial laboratories performing analysis of complete feeds and feed ingredients

Barrow-Agee Laboratories 

Memphis, TN

www.balabs.com

 

Colorado Analytical Laboratory 

Brighton, CO 

www.coloradolab.com

 

Cumberland Valley Analytical Services, Inc.

Waynesboro, PA  

www.foragelab.com

 

Eurofins Nutrition Analysis Center

Des Moines, IA 

www.eurofins.com

 

Great Plains Analytical Laboratory, Inc.

Kansas City, MO 

www.gpalab.com

 

Midwest Laboratories, Inc. 

Omaha, NE 

www.midwestlabs.com

 

North Dakota State University

VDL (mycotoxins only) 

Fargo, ND 

www.vdl.ndsu.edu

NP Analytical Laboratories

St. Louis, MO 

www.npal.com

  

SDK Laboratories, Inc. 1000 

Hutchinson, KS 

www.sdklabs.com

 

Servi-Tech, Inc.

Dodge City, KS  

www.servitech.com

 

Servi-Tech, Inc.

Hastings, NE  

www.servitech.com

 

Ward Laboratories Inc. 

Kearney, NE 

www.wardlab.com

 

Waypoint Analytical, Inc.

Memphis, TN  

www.waypointanalytical.com

 

Romer Labs, Inc. 

(mycotoxins and residues)

Newark, DE 

www.romerlabs.com

This listing is for information purposes only.

  

Interpretation of analysis results

The analysis results should be interpreted on as-fed, as-is, or as-received basis, but not on dry-matter basis. These values can then be compared with the expected nutrient specifications of ingredients or with the intended nutrient levels in diet formulation (Reese and Thaler, 2010). The analyzed values generally do not match the expected values perfectly because of normal variations associated with sampling and laboratory analyses. The errors associated with sampling can be minimized by following the procedures for sample collection described above. The analytical variation is usually taken into consideration to determine acceptability of feeds and ingredients, which is generally around 15 to 25% in most nutrients (AAFCO, 2018) (Table 1).

 In cases where the analyzed values do not fall within the expected range after considering the analytical variation, it is recommended to submit the retained sample for a repeat analysis. If the analyzed values are consistent between the first and second analysis, there could be an indication of a problem in diet formulation, feed manufacturing, or sampling, or a variation in ingredient quality or nutrient profile. 

Analytical variance for analysis of feed ingredients