Total Tract Fiber Digestibility

Jamie) Welcome to Farm Factor! Let’s join Kyle and Courtney Duxbury as they discuss Total Tract Fiber Digestibility, a new testing method for forages.
(Kyle) Hi this is Kyle Bauer in Dodge City at Alfalfa U. visiting with Courtney Duxbury. She is with Rock River Laboratories. And they are implementing a new way of testing forage. Can you tell us how this came about and why it came about? (Courtney) Yes, so this test called TTNDFD, is called Total Tract Fiber Digestibility, was developed at the University of Wisconsin by Dr. David Combs. And we have been the first lab to adopt this new technology and license it through the University of Wisconsin. And it’s a more complete way to estimate your fiber digestibility for rumen animals. (Kyle) One thing from what I’ve seen today is the old test showed two samples that appeared identical, but on the new test, but what they found was that the performance of the two were not the same. Your test shows that difference in performance. (Courtney) Yes, so with something like RFV, you’re just taking the ADF and NDF and you’re not fully evaluating the whole digestibility of that sample, severely underestimates the complexity of fiber digestion. So with this TTNDFD it’s actually the first digestion analyte available that can be related directly back to production in dairy cows. So for every two to three point increase or change in TTNDFD, you will see a pound increase in milk as well. (Kyle) So how does this test take, how is it taken and how long does it take? (Courtney) You would take your sample just like any other forage sample. This can only be done on specific forages like corn silage, hays, haylage and small grain silages. We can’t analyze it on whole TMR’s yet. So, then you take your sample as normal, send it to our lab and the day that we get the result, or get the sample you’ll have the results in the afternoon, by NIR technology. And this runs about $26 dollars, so it’s not all that expensive. If we run into wet chemistry, then it takes a lot more time and a lot more money. (Kyle) Now NIR, that refers to? (Courtney) Near-Infrared Spectroscopy, which most feed analysis is done that way. I’d say about 90 percent of our business is by NIR technology. It’s a very accurate and cost effective way to test your forages. (Kyle) We’re visiting about new testing methods for forages. This is Kyle Bauer reporting from Dodge City. Back to you Jamie.
(Jamie) Folks, stay with us – Kyle will be back with Dave Murdock from New Holland.

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