Management of Cows with Limited Forage Availability

March 2017


Cull Poorer Producing Cows
Many producers are faced with limited forage availability due to drought and/or fire. One of the first management tools that should be evaluated for cow/calf producers is to cull poorer producing cows. This will allow for capture of their value at a time in the cattle cycle when prices for cows and culled replacement heifers are fair. It will also allow for some capital investment to be used when cattle prices are considerably lower and forage supplies are more plentiful.
Below is a suggested order of culling in the face of diminishing forage supplies.
Culling Order
1. Open (non-pregnant) old cows.
2. Open replacement heifers.
3. Old cows with unsound mouth, eyes, feet, and legs.
4. Open cows of any age.
5. Thin cows over 7 years of age (Body Condition Score < 4).
6. Very late-bred 2 year olds.

The first two items on the list are automatic culls in any forage year. Old open cows are not worth keeping through a low-forage, expensive feeding period.  Replacement heifers that were properly developed and mated to a fertile bull or in a well organized artificial insemination (AI) program should be pregnant. If they are not bred, there is a likelihood that they are reproductively unsound and should be removed from the herd while still young enough to go to the feedlot and grade choice with an A maturity carcass. The more difficult decisions on culling come when the producer is short enough in forage and feed supplies that he/she feels the need to cull cows that have been palpated and found pregnant. Culling starts with number five on our culling order. This is necessary only when grass and feed supplies are very short. The thin older cows are going to require additional feed resources to have a high probability of being productive the following year and the late-bred 2-year-olds are least likely to have long-term productivity.

Feeding Options
Once poorer producing cows have been removed, there are several options to meet the nutritional demands of cows. These include moving them to alternate grazing locations, obtaining hay, feeding a complete diet, or limit feeding an energy supplement to extend hay or pasture resources. Decisions should be based on the additional labor requirement, management skills, feed storage capacity, and the availability of feed bunks, feed delivery equipment, and a well drained drylot or sacrifice pasture. Grazing forage has always been and will continue to be the most economical and practical way to maintain beef cows. However, in unique situations, limit feeding may be an economical alternative to purchasing expensive hay. The cost effectiveness of limit feeding will depend on each producer’s price of alternative forage, the price of grain or by-product energy sources and the price of the protein supplement needed for the hay or limit feeding program.
Moving to alternate grazing locations or obtaining hay to feed free choice will require the least daily labor input. Feeding complete diets or limit fed hay and energy concentrate will require more facilities and daily labor. Depending on the price of grain, nutrients to maintain cows may be cheaper to purchase through concentrate feeds rather than roughage.

Obtain Sufficient Hay
For cows in late gestation or early lactation, 27 lbs per day of hay that is at least 59 percent total digestible nutrients (TDN) and 9 percent protein is needed to meet the demands of average milk-producing 1,200 lb cows in mid lactation.
Feeding a Complete Diet
If hay in sufficient quantity or quality is not available, you can consider limit feeding hay that is available with a concentrate diet. If no hay is available or limiting hay consumption is not feasible (see “Limit Feeding Hay” below), Table 1 represents a complete diet that can be limit-fed. This diet should be fed with a good quality free choice mineral that contains an ionophore. Table 2 provides calculated feeding rates for late gestation and lactating cows in good body condition. Feeding this diet free choice will result in cows becoming heavy conditioned and result in higher cost than feeding good quality hay.

Table 1. Complete diet for maintaining cows. 
IngredientsComposition, % As-fed
Cracked corn10
Corn gluten feed28.75
Cottonseed hulls20
Soybean hulls20
Corn distillers grains20
Limestone, 38%1.25
Calculated nutrient concentration%, As-fed
NEm, Mcal/cwt75
TDN, %66.1
Crude protein, %14.6
Calcium, %0.74
Phosphorus, %0.42

Table 2. Guidelines for limit fed complete ration (Table 1) for cows in average body condition. 
State of Production
GestationLb, As-fed
1100 lb16.8
1200 lb17.6
1300 lb18.4
Lactation (average milk)Lb, As-fed
1100 lb20.5
1200 lb21.5
1300 lb22.4

Limited Forage Available – Limit Feed Concentrate Mix
Table 3 includes guidelines for rations based on corn grain, supplement and minimal amounts of long stemmed hay. Several Oklahoma feed manufactures have supplements formulated for feeding with limit fed corn and hay. Table 4 represents a protein supplement designed for use in limit feeding beef cows. These diets require added limestone if the protein supplement does not contain at least 2.5 percent calcium (Ca). The added calcium is to offset the high phosphorus content of corn. An additional method of supplying the needed calcium would be to use a mineral supplement designed for cattle grazing wheat pasture because they typically have high calcium and low phosphorus contents. Salt and vitamin A should also be provided in the supplement or a free choice mineral. The concentrate portion of these diets should not be fed free choice.

Table 3. Guidelines for limit fed corn rations for cows in average body condition.    
State of ProductionWhole corn
Lb, As-fed
38 to 44% protein supplement
Lb, As-fed
Long stemmed grass hay
Lb, As-fed
Limestone
Lb, As-fed
Gestation
1100 lb8.325.50.2
1200 lb9260.2
1300 lb9.826.50.2
Lactation (average milk)
1100 lb1135.50.2
1200 lb12360.2
1300 lb1336.50.2

Table 4. Protein supplement for use in limit fed corn diets.   
aTo provide 60 mg Rumensin per pound of supplement.
Ingredients%, As-fed
Soybean meal, 47%5929.5---
Cottonseed meal---29.5---
Linseed meal------81.06
Wheat middlings22.9622.960.9
Limestone, 38%555
Cane molasses3.83.83.8
Salt2.52.52.5
Urea2.32.32.3
Dicalcium phosphate333
Potassium chloride111
Copper sulfate0.040.040.04
Selenium 6000.150.150.15
Zinc oxide0.020.020.02
Vitamin A, 30,000 units per gram0.150.150.15
Rumensin 80®a0.080.080.08

Table 5 represents a complete supplement mixture that is designed for use in limiting feeding situations. It is similar to several 14 percent crude protein mixes that are available through local feed manufactures. On an as-fed basis, it is calculated to contain 13 percent protein, 70 percent TDN, 0.60 percent Ca and 0.55 percent phosphorus (P). Table 6 provides suggested feeding rates for these types of supplements along with 0.5 percent body weight of hay. If producers are not set up to handle bulk grain or other commodities or do not have the equipment and/or feed bunks necessary to feed grain, this mix can be made into 3/8- or 3/4-inch cubes for feeding on the ground. Because of the high level of corn and soybean hulls, the pellets or cubes will be somewhat soft. Consequently, handling, auguring, etc. should be minimized to reduce the amount of fines. As an alternative, many feed manufacturers already have available 20 percent cubes that will work well for this purpose.

Table 5. Complete supplement composition, % As-fed. 
Ingredient Wheat middlings/soybean hulls
Wheat middlings 38.1
Soybean hulls 28.6
Cracked corn 24.2
Cottonseed meal 2.86
Cane molasses 4.73
Limestone, 38% 0.952
Salt 0.476
Rumensin 80 0.024
Vitamin A, 30,000 units per gram 0.029
Copper sulfate 0.005
Selenium 600 0.029
Zinc oxide 0.0001
Table 6. Guidelines for limit fed complete supplement (Table 5) for cows in average body condition.  
State of ProductionWheat middlings/soybean hull supplement
Lb, As-fed
Long stemmed grass hay
Lb, As-fed
Gestation
1100 lb14.55.5
1200 lb156
1300 lb15.56.5
Lactation (average milk)
1100 lb185.5
1200 lb18.76
1300 lb19.56.5

Limit Energy Concentrate Feeding Management Tips
Limit feeding energy concentrate diets to breeding females will require greater skill and discipline on the part of the herd manager. Acidosis, bloat, founder, etc. are always a risk when energy concentrate diets are fed to ruminants. These risks can be minimized by the following management practices:
1.    When starting the concentrate feeding program, gradually increase the amount of grain fed and reduce the amount of hay fed over a 2-week period.
2.    Provide plenty of feeding space to accommodate uniform consumption. A minimum of 30 inches of linear bunk  space per cow should be used, more for horned cows.
3.    Whole shelled corn is safer to feed compared to finely processed grain. If the grain must be processed, it should be coarsely rolled or cracked.
4.    Long stemmed hay should be fed at a minimum DM level of 0.25 percent and up to 0.5 percent of body weight for cows receiving whole shelled corn. If cracked or rolled corn is used, provide a minimum of 0.5 percent body weight hay DM, but do not exceed 0.75 percent. Feeding less hay reduces the cost, but increases the need for greater management intensity. As the cows and the manager adjust to the program, the amount of hay fed can be gradually reduced to the minimum value suggested above.
5.    Feeding an ionophore will help prevent acidosis and bloat as well as reduce the amount of feed needed by 7 to 10 percent.
6.    Feed cattle at the same time every day. Altering the time of feeding, especially in limit feeding programs, greatly increases the risk of digestive upset. An ideal feeding  situation would be one where corn, hay and supplement could be placed in the bunk ahead of time. At the appropriate time of day, the cattle would be given access to the feed by simply opening the lot gate. An alternative would be to feed the hay before the grain and supplement.
7.    Remember, the idea is to supply a ration in a very small package that is highly concentrated in energy. Consequently, the total pounds consumed per day will be less than the cattle are accustomed to. The cattle will likely act hungry for the first few days. They will also have a gaunt appearance, compared to cattle receiving free choice hay or pasture. Resist the temptation to feed more because they act or look hungry. Otherwise the advantages of decreased cost and/or decreased hay utilization will be negated.

Limit Feeding Hay
The most certain way to make sure the cows are receiving adequate hay in limit feeding situations is to limit feed hay daily along with the concentrate. This could be practical with square bales, a hay grinder, or the ability to unroll bales for the cows. If that is not possible, controlling access to round bales my be an option. For this method, facilities are needed in which the cows and hay are maintained separately, and also be sure to have sufficient bales available for all cows to eat at one time. It may be difficult to get cows away from the bales, so it is recommended to place the bales in one pen and then feed concentrate in bunks in additional pens or pasture. If cubes are being fed on pasture, bunks would not be required. There are two strategies for time limit feeding hay with concentrate diets, daily or every other day.  For the daily method, cows should be allowed access to their hay for approximately 45 minutes. If allowing access to hay every other day while limit feeding concentrates, cows should be allowed approximately 4 hours of access to the hay. It is NOT recommended that you feed hay less frequently than every other day. Hay should always be fed before the concentrate to ensure adequate hay intake. Feeding the concentrate after the hay may also be helpful in getting the cows to leave the hay. Limit feeding hay may result in cows acting hungry for the first couple of weeks.

 

Chris Richards
Beef Cattle Specialist

Dave Lalman
Beef Cattle Specialist

Glenn Selk
Former Beef Cattle Specialist

DASNR Extension Research CASNR
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