TMR Sampling: Valuable Exercise or a Random Number Generator?

Published on: 10/21/2019
Author/s : Bill Weiss 1; Peihua Zhang 1, John Goeser 2, and Normand St-Pierre 1. / 1 Department of Animal Sciences, The Ohio State University; 2 Rock River Laboratory, Inc. and Department of Dairy Science, University of Wisconsin.

Introduction Proper sampling of ration ingredients and submitting those samples for nutrient analysis to a good lab are essential components of diet formulation. The relative importance of sampling, analytical, and real variation on overall variation in nutrient composition data of ingredients has been discussed at previous conferences (Weiss et al., 2012; Weiss et al., 2014). Sampling variation ...

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Ehsan Ehsan
Animal Nutritionist
October 21, 2019
Great work. What do you mean by "duplicate" sampling? It means dividing the same sample to 2 samples and analyzing both of them separately?
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October 21, 2019
Ehsan The samples must be independent, not subsamples. So you sample forage, put it into a bag and then repeat entire process and put other sample into a bag and have lab analyze each bag
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Ehsan Ehsan
Animal Nutritionist
October 25, 2019

William P Weiss Thanks Bill. What would be your recommendation for sampling throughout the feed bunk? Do you recommend to take duplicate samples from the beginning, middle and the end of feed bunk and pool the to make 2 separate polled samples?

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October 25, 2019

Ehsan The samples must be in their individual bags, It is not in their sub-samples. thus, when you sample forage, you must keep it in a bag and as well repeat the entire process. Other samples should be kept in a bag. Analyze each bag in the Lab separately.

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Ehsan Ehsan
Animal Nutritionist
October 26, 2019

Nwose Roseline Nwuguru I got the point, but my question was about a common method which is being used by farmers. Usually, we take samples from the beginning, middle and end of feed bunk and pool them together. My question was: can we duplicate this method and have two pools?

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