Grazing cover crops is not a new concept, but a common frustration can be the lack of consistent rain to germinate and grow the crop. What if we could plant cover crop mixes under irrigation specifically for grazing? That was the question Haven, Kansas producer, Jeff Brawner, set out to answer in 2018.
To start, Jeff had to determine what crops would be good for grazing while improving the health of his soil. Early in 2018, Jeff planted a mix of rye, buckwheat, flax, safflower, crimson clover, mustard, triticale and oats on 160 acres under a center pivot. In March he moved his cow herd onto the covers allowing them to graze only small paddocks of fresh forage every day. He grazed that mix until June and then planted a mix of BMR sorghum sudan, Hybrid Pearl Millet, Brown Top Millet, Red Ripper Cowpeas, Laredo Forage Soybeans, Sunn Hemp, Okra, Buckwheat and Peredovik Sunflowers.
He began to graze the summer mix with 170 pairs in August and removed them mid-October. Jeff says that it takes daily moves to make the system work but he would rather move fence to feed his livestock than feed them in a dry lot at a bunk. It takes him 40-60 minutes to move the fence versus 2 hours to mix feed and haul it to the cows.
A higher level of management is needed to properly graze the cover crops and leave enough residue to feed the underground “livestock”. He added that “you have to be willing to adapt and change every day.” Depending on the weather, plants grow slower or faster and Jeff says you have to watch your plant growth and be willing to change the size of your paddock. He continued, “if you are leaving the soil too bare you either have to speed up your moves or give the cattle more acres to graze. If you are leaving too much residue behind you need to slow down or shrink the paddock size.”
Providing water in a rotational grazing system is often a challenge since the cattle are always on the move. Jeff uses a plastic barrel cut in half with a float and flexible pipe to provide water for the 170 pairs. At first, I wondered how one half of a barrel could provide water for that many head until Jeff explained that the key is to never let them run out of water. When the cattle have water constantly available they are willing to take turns drinking rather than rushing the water source with lots of pushing and shoving.
Jeff says the grazing system uses about half the irrigation water needed for a cash grain crops. This saves pumping costs as well as conserving water.
