For nearly four decades scientists have been refining their ability to test forage quality. This has been done in an effort to improve animal nutrition and consequently animal production. Analytical procedures that previously required a week, or more, to complete can now be done in less than 10 minutes and with more accuracy than before. As the ability to analyze forages has improved, the understanding of how to use the test results to improve animal efficiency and performance has also improved. Unfortunately though, forage quality testing is a valuable management tool that many livestock producers still do not utilize.

Greater net profit is the bottom line for why livestock producers need to know the quality of the forages they are feeding! Not knowing the exact quality of the forage being fed is a two-edged sword that can cut into profits either way it swings. A dairy producer who guesses that the crude protein (CP) content of the haylage is 2% units lower and corn silage is 1% unit lower will be feeding more supplemental protein than is necessary. This extra CP to the ration will add $0.09/cow/day in feed costs. With a herd of 100 cows, this is equivalent to $9.00/day. It would take just a little over 3 days of not knowing the quality of the forages and feeding extra protein, as in this example, to pay for the cost of quality analyses (forage quality testing usually costs less than $15.00/sample).

The other edge of this two-edged sword of not knowing forage quality, is over estimating forage quality. Guessing that forage crude protein is greater than what it actually is resultes in adding insufficient supplemental protein to the ration and saving feed costs. Unfortunately, the cows are being “short changed” on CP which could have a negative impact on milk production, especially in early lactation.

It is also important to note that guessing at fiber and mineral content will also have enormous economical impact. For example, the neutral detergent fiber (NDF) content of forages helps determine how much of the forage an animal will consume. Guessing too high or too low can have tremendous implication on intake, animal performance, and health. Knowing the quality of the forage being fed to animals not only saves or makes more money it also allows managers to provide better animal nutrition which will result in greater animal production and improved animal efficiency (lb milk or weight gain per pound of feed consumed).

Knowing the quality of forages when selling or buying them has also proven to be economically smart. At Pennsylvania hay auctions, where the quality of the hay is analyzed, and the results posted on each load prior to the auction confirms the economic value of knowing hay quality. At these auctions, each percentage unit increase in crude protein resulted in $8.00 more per ton. Selling 10 ton of 20% CP hay as 18% CP hay because the quality was not tested will cost the seller about $160! On the other hand, buying 10 ton 18% CP hay as 20% CP hay cost the buyer $160! A similar relationship between quality and price did not occur at hay auctions when the quality of the hay was unknown. Establishing a “fair” price for hay, if you are buying or selling, involves both parties knowing the quality of the hay.

By: Gary Bates, Professor and Director, University of Tennessee Beef and Forage Center

Everyone wants to increase yield.  Usually it means providing more of some type of input.  Maybe more fertilizer, or irrigation, or some other thing that will make plants grow at a faster rate.  But there is a simple way to make our pastures grow faster and produce greater yield.  It involves simply understanding and manipulating a simple principle of plant physiology.  That principle is that plants grow at the fastest rate when they have plenty of leaves to capture sunlight, and the leaves are relatively young so they are very efficient at the photosynthetic process.

Figure 1 illustrates the three phases of plant growth.  In phase 1, the plant doesn’t have much leaf area to capture sunlight.  In order to grow leaves, it has to take stored energy from the roots and crown of the plant for the growth.  It then moves into phase 2, when the plant has plenty of young, efficient leaves.  During this phase, the plant produces plenty of energy for growth, as well as replace the stored energy used during phase 1.  As the plant continues to grow, the leaves get older and less efficient at photosynthesis.  The plant also produces a seedhead, which means it is trying to produce seed instead of leaves.  This results in a decrease in the growth rate of the plant.

Figure 1. Three phases of plant growth

A simple way to increase the yield of a pasture is to concentrate on keeping your grasses in the phase 2 of plant growth.  That means to make sure you leave enough leaf area so the plants can capture plenty of sunlight.  But don’t let the plants go to a reproductive state, meaning they are producing seedheads.  Staying in phase 2 will improve yield, because that is the phase where the growth rate is the highest.

How do you accomplish that?  You have to have some type of rotational grazing program, where you control where the animals graze and how long they stay in the paddock.  If you find that the forage growth is getting ahead of you in the spring, then cut hay from some of the fields.  If you find forage growth is getting slow during the summer, you can do a better job preventing overgrazing.

There is no need to make rotational grazing extremely complicated.  The principle is controlling plant growth through where the animals graze.  This will ultimately improve yield, plant persistence, and the production of forage and beef on your farm.