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TMR Sampling: Valuable Exercise or a Random Number Generator?

Published: June 2, 2017

Summary

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 variati...

#Dairy cattle nutrition

Authors:

William P Weiss

Ohio State University

John Goeser

University of Wisconsin - Madison

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5Comments

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Comment

Ehsan

21 de octubre de 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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William P Weiss

Ohio State University

21 de octubre de 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

25 de octubre de 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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Nwose Roseline Nwuguru

25 de octubre de 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

26 de octubre de 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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