Forage testing and inventory control will be critical with this year’s variable forages.
By Jim Peck, Dairy Today contributor
Challenges abound. With wildly variable weather patterns, this year seems to have its share. It is always too wet or too dry some place, but this year it seems to be really too wet or really too dry in most places. I am seeing some of the best and some of the worst corn; unfortunately it may be in the same field.
In many places some of the early planted is offset by some that was planted late. Delayed first cutting alfalfa has messed up the summer’s cutting schedules and in some cases will prevent an entire cutting this season. The unusual weather patterns have altered the growth characteristics and eventually the feeding values of many of our crops, especially the forages.
Variations and unknowns will become the norm in planning and implementing feeding programs. By the time you are reading this, much of the corn silage harvest will be wrapping up or completed. You will have an idea of what your inventories are and the final crop conditions. The next step is to work with what you have into a feeding plan.
It is common for corn silage grown under stressed conditions to have increased variability in both nutrient content and feeding values. In the field, it shows up as variations in ear size and maturity from plant to plant and between areas in the field (mostly due to drainage).
In hay crops, the variation is more subtle, but it is still there. Fortunately, harvesting and storage techniques tend to average those variations out, but do not change the cumulative effect on the overall crop.
That brings me to the value of some of the tools in the nutritionist’s tool box: Feed analysis, interpretation and implementation. Over the years the feed analysis has been developed, refined and adapted to be one of the most valuable tools we have, especially in a year like this when a lot of feeds that are just outside the normal expected parameters and some may be really unusual.
The first step is to do a complete inventory of all the various groups and individual batches of feeds. Included in the inventory should be an inventory of the numbers and types of animals (cows, heifers, feeders, etc.) that will be fed. It should be a part of an ongoing rolling inventory of your feeding system.
The second step is to characterize each batch in terms of quality, storage condition, fiber characteristics using the Penn State Particle Separator on forages and its location (accessibility). Define each in terms of tons and the desired feeding periods.
The third step is to analyze the feeds. Basic nutrient content, protein fractions, fiber fractions, and digestibility are basic. Local practices of individual labs and nutritionist are important to the interpretation of your specific analytical work. The most important aspect is to use proper sampling techniques and a multiple sample protocol to establish reliable feed value data. Remember, a grab sample does not characterize a bunk of silage, nor do one or two samples establish a trend.
- October 2013