Category Archives: Feeding

Micro Machines

Micro machines are widely used in the US and are gaining popularity in Canada. These machines dispense additives (i.e. Monensin, MGA etc.), removing the need to have a unique supplement/bin for each combination of additive fed. In the US, the two most common micro machines are made by Micro-Beef and Lextron. Using these machines require you to buy the additives from the company that makes the machine.

A machine made in Saskatoon by Comco Controls is gaining popularity in both US and Canadian feedlots. Mechanically, it is similar to the alternatives. The big difference is that it is marketed separate from the additives it dispenses allowing you to buy cheaper additives. Another difference is that the Comco machine is now integrated with Fusion. Now you can add each additive as you do other ingredients in a ration formula. As a load of feed is being made, Fusion communicates with Comco to start batching the proper additives. At the mill, a push of a button in Fusion dispenses the additives onto the load of feed. The larger Comco bins also make it easier to add a trace mineral/vitamin package through the machine. For many diets, calcium could be the only other nutrient that needs to be supplemented. In other words, it is feasible that limestone and a Comco machine could deliver all the supplementation that is needed. This could reduce supplementation costs considerably.

Together, Comco and Fusion can increase simplicity, accuracy, and cost savings.

(An Excel spreadsheet is available to help determine proper levels of additive to enter into Fusion.)

Switching to Dry Matter Based Feeding

Moisture is a worthless, confusing component of all feed ingredients. Because it is has no value, moisture has a big (but often hidden) impact on the accuracy and economics of feeding cattle. Most feedlot diets contain high moisture ingredients such as silage, therefore moisture levels need to be considered when formulating diets and making bunk calls. We are so used to working with the moisture in feeds, we often don’t appreciate how it inflates value and complexity. Most feedlot nutritionists balance nutrients and ingredients with moisture removed (dry matter basis). Most additives are cleared to be fed at a specified concentration of the dry matter. Intakes of cattle are limited primarily by dry matter content of the diet.

Working with dry matter is unfamiliar to most feedlot managers. However, once accustomed, working with dry matter is actually simpler, especially since calculations are automatically done by Fusion. In the following discussion, AF = “As Fed” (what is actually fed). DM = dry matter (all moisture removed).

Moisture Impact on Diet Formulas

If we have a diet that is 50% barley (88% DM) and 50% silage (35% DM), 100 pounds of this mix contains (50*.88=) 44 pounds of barley DM and (50*.35=) 17.5 pounds of silage DM. So in 100 pounds (AF), this mix contains 44 + 17.5 = 61.5 lbs total DM (61.5% DM). The dry matter formula contains 44/61.5 = 71.5% barley and 17.5/61.5 = 28.5% silage. When the water is removed we see this ration contains a lot more grain than is evident in the as fed formula.

Most additives are to be fed as a concentration of the dry matter. For example, if a feedlot is providing monensin through a supplement and targeting 33 mg/kg of diet DM, the supplement must be included at a constant percent of the diet dry matter. Maintaining a consistent concentration of the dry matter is simple when formulas are entered on a DM basis; Fusion automatically does the math, the feed crew won’t even notice. For perfect accuracy, ration AF formulas (but not DM formulas) should change with changes in ingredient DM. Fusion automatically makes these adjustments when rations are entered on a DM basis (but not when entered on AF basis). When formulas are entered on an AF basis, feedlots typically rely on a nutritionist to do these calculations. As a result, ingredient dry matters aren’t adjusted very frequently, reducing accuracy of dry matter intakes, feed conversions, and costs of gain.

Making Bunk Calls as Quantity of DM/hd

At a typical feedlot that makes bunk calls as total pounds AF, bunk calls can vary by over 2-3 fold across pens. This variance is due primarily to differences in head count and ration moisture. Obviously, if a pen has twice as many cattle in it, it will require about twice as much feed. Similarly, rations with vastly different moisture content will have large differences in pounds AF required. For example, if potatoes were introduced in a finishing diet, AF (but not DM) intake would suddenly increase due to the high moisture content of potatoes. As well, as cattle are stepped-up on feed with reducing levels of silage, AF intakes may decline. Although other variables such as animal size and energy content/digestibility influence intakes of a pen, the primary factors are animal numbers and moisture content. Making bunk calls as pounds of dry matter per animal removes these variables so bunk calls are more meaningful and consistent across pens. The value of working with dry matter is amplified when feeding high moisture products like silage and potatoes.

Again, adoption of this new way of making bunk calls will be simplified if you abandon old thinking rather than always trying to convert back to it. The following thumb rules may help adopt this new logic:

  • Yearlings will typically start at about 1.5% of their body weight (12 pounds for a 800 pound animal). You will be lucky if calves start at 1%.
  • Increases of up to 2 pounds may be needed initially for yearlings.
  • Once cattle are settled in the feedlot, a change of more than 0.5 pound should rarely be required.