Braman and Kurtz, 2015
Does CSPS influence starch digestibility?
The objective behind processing the corn silage prior to ensiling is to fracture the corn kernels in the corn silage. This will expose the contents inside the corn kernel (which includes starch) to the rumen microbes. This concept is demonstrated in the above slide. As the kernel processing score increases, the amount of starch in the feces decreases. This indicates that more starch was able to be digested and didn’t end up in the feces undigested.
Harvest time is the best time to be evaluating the CSPS on your fresh chopped corn! Ag Health Labs has a Ro-Tap machine and performs CSPS in house. Drop samples off at Ag Health Labs and results will be available in 1 to 2 business days. Call, email, visit our website, or drop by if you would like more information on CSPS.
NIR versus Wet Chemistry Minerals
Ag Health Laboratories reports some macro mineral values on the NIR results. These values are reported even though it is known that the error associated with NIR prediction of macro minerals will be higher than for organic nutrients such as protein or NDF. The reason for the higher error is that minerals are inorganic, and inorganic molecules do not absorb light energy in the near infrared region. Therefore, in order to predict the mineral value in an organic feedstuff, mineral calibrations are based off of organic molecules that have an association with minerals. It is an indirect relationship which reduces the accuracy in prediction of minerals.
With that said, Ag Health Labs will continue to report NIR mineral values. However, we encourage you to use caution when interpreting reported NIR mineral values. If critical decisions (balancing DCAD rations, buying/selling hay based on mineral levels, etc.) are being made based on the mineral content of the forage, it is recommended that wet chemistry methods be used to measure mineral content.