Summer will soon officially arrive, bringing the challenge of managing horses during hot weather. Horses can acclimate to hot and humid environments. A 15-day to 21-day acclimation period is recommended for horses originating from cooler or drier climates that are traveling to compete or reside in hot, humid conditions. The acclimation period results in an increased tolerance to both heat and exercise. However, acclimation does not reduce the need for close monitoring of horses during training and competition in these environments.
To help reduce the effects of heat and keep horses comfortable, consider the following:
Provide turnout during cooler times of the day—early in the morning, late at night or overnight.
Provide relief from the sun through access to shade from trees or buildings. Remember that shade will change throughout the day, and constructed buildings may block natural air flow.
Watch for signs of sunburn, especially on white or light-colored areas. Use masks to protect the horses’ faces.
Fans help to improve airflow, but be sure to keep cords and plugs out of the horse’s reach to prevent electrocution.
Ensure access to clean, cool water at all times. “Cool” is defined as being 45 to 64 degrees. Depending on feed, an adult horse in a cool climate will normally drink 6 to 10 gallons of water each day while at rest and much more while working or in situations with high heat and humidity.
Water buckets and tanks may need to be cleaned more regularly in hot weather as algae and bacteria grow rapidly in warm water. Blue algae toxicity is more common in ponds or slow-running streams during hot, dry weather.
Free-choice access to salt will encourage drinking. The two electrolytes that most often need to be replaced from sweating are sodium and chloride, which make up salt. Loose salt is preferred to a salt block. Offering free-choice MFA 5% Horse Mineral with Shield also helps to mitigate heat stress. It contains salt as well as essential oils and a proprietary blend of botanical extracts and synbiotics, all of which help boost the horse’s health and immune system.
Consider providing electrolytes to horses that have been sweating heavily or are expected to do so. If electrolytes are added to drinking water, also offer plain water since some horses dislike the taste of electrolytes and will drink less. This situation is similar with people—some like to drink Gatorade. Others do not.
Reduce riding intensity and length. Heat stress can affect any horse but is especially common in older, obese and out-of-condition horses. Young foals also tend to be more prone to heat stress and dehydration.
Clip horses with long hair coats, such as horses with Cushing’s disease, to enhance cooling.
Transport horses during the coolest part of the day. Ensure that trailers are well ventilated. Offer water frequently. Do not park in direct sunlight with horses inside.
Horses that have little or no ability to produce sweat have a condition called “anhidrosis-hypohidrosis,” and are prime candidates for heat stress. Research shows 2% to 6% of horses can develop this issue. They may require additional management strategies to mitigate the effects of heat stress, such as electrolyte therapy.
Avoid riding a horse when the combined temperature in degrees Fahrenheit and percent relative humidity is greater than 150. For example, if it is 80 degrees out, a relative humidity of greater than 70% exceeds the 150 calculation.
If a horse must be worked during hot and humid weather, consider adjusting your schedule to ride early in the morning or late at night. Work the horse in shade when possible, and keep the work light. Include frequent breaks that allow the horse to cool down and regain a normal respiratory rate. Do not work the horse beyond its fitness level. Watch for normal sweating. Inside the stable, create airflow, use fans and exploit the “chimney effect,” in which rising warm air forces cooler air to infiltrate through doors, windows or other openings. Provide access to cool, clean water at all times and offer water frequently during work.
How consistent is the ration you are feeding? Inconsistencies can set cattle up for nutritional issues or lead to disappointment when performance suffers. Either outcome has economic consequences. Mixing efficacy, or lack thereof, can have just as much impact on the outcome of the ration as the formulation.
Ultimately, the main goal of mixing a ration is to blend ingredients in a way that delivers the same amount of ingredients and nutrients to every animal in each bite of every feeding. Evaluating variation in nutrient or ingredient levels is one of the most cost-effective and reliable means of monitoring ration consistency.
To evaluate ration consistency, collect five samples from the bunk, spaced evenly from the beginning through the end of distribution. These samples should be collected as soon as possible of delivery to the bunk, and sample collection should be replicated across three to five separate batches or feedings.
If possible, follow the mixer through feedout. Avoid collecting samples after cattle have had time to eat, as the results obtained from these samples will mislead you to believe there is an issue with mixing efficacy when there may not be.
Once the samples have been collected, they should be submitted to a laboratory for analysis. Sodium, crude protein and fiber—either neutral detergent fiber or acid detergent fiber—are often used as markers.
Another marker often used is an ionophore, such as Rumensin or Bovatec, or a micronutrient such as a specific vitamin or trace mineral with a known target concentration. It is usually cheaper to test for sodium, which is added in a relatively large amount from a single source. The sodium content in plant materials will be low and have little variation.
If there is an issue with ration uniformity, it can usually be addressed by troubleshooting the source and uniformity of ingredients, level of ingredients, order of ingredient addition to the mixer and mixing times.
A problem with mixing efficacy, whether it’s undermixing or overmixing, is most commonly caused by adding ingredients in a sequence that does not allow them to blend sufficiently. Often, the order of addition is based on convenience rather than the kinetics of blending. If the goal is to create a uniform ration, ingredients should be included in the right order and blended for the amount of time necessary to disperse throughout the entire mixture without causing them to re-segregate or settle.
This is a fairly complex topic dependent upon a combination of many factors. But for now, consider the physical characteristics and inclusion level of each ingredient and how that may contribute to ease or difficulty of dispersion throughout the ration. The ingredients together should be more similar rather than less similar.
One of the most common areas of concern is the dispersion of micro-ingredients, such as drugs or other additives. If lack of dispersion of these ingredients is leading to a high level of variation, first consider the level of inclusion. It is nearly impossible for most mixers to disperse a very small amount of these ingredients throughout a batch without a micro-machine. If this is the issue, and a micro-machine is not an option, premixing is likely the solution.
Indeed, both Rumensin and Bovatec labels suggest making a premix first. It follows that micro-ingredients, those used at less than 1 percent of the mass, should first be mixed and then blended with a carrier. Nutritionists usually prefer the premix be formulated for inclusion at approximately 5 percent to increase the likelihood of consistent and complete dispersion.
Also, check the scales to ensure that they are accurate. If they are, then ensure the correct amount of each ingredient is being added and the ration does not call for an amount more precise than you can measure or effectively add to the mixer. Rations should be formulated only to that degree of precision that can be achieved. Small inconsistencies can have a substantial effect on uniformity.
What do you see when you look at a forage stand? A source of livestock feed or a commodity to be sold? The more forage you have, the more cattle you can feed. Fertilizer is a principal input cost for a forage crop. There are no substitutes or shortcuts for providing adequate nutrients. Cutting back on fertilizer will likely cost more over the long run because of decreased yields and stand longevity.
When you add up all the pasture, grass hay, alfalfa, corn and sorghum-sudan silages, millets and grazing small grains, forages account for the most acreage of any U.S. crop, yet they continue to be neglected when it comes to fertilization. The majority of grazing lands receive no fertilizer of any kind. The resulting low forage yield and daily rate of gain are widely accepted on land with low perceived value.
It is good to look for ways to reduce fertilizer costs, but it’s all about efficiency of production. Indiscriminate reductions in fertilizer will likely lead to reductions in yield and an increase in the unit cost of hay. Cutting costs in forage production should be done in a way that has minimal impact on forage yield.
Make the investment in fertilizer more efficient by using soil test results. If you do not soil sample and apply fertilizer and/or lime based on the results of those tests, it is likely that the appropriate amount is not being applied. If nutrients are under-applied, the result is forage yield below its potential. If over-applied, then costs were incurred that won’t produce a positive response. Few other practices in forage production can improve the profitability more than soil testing and following fertility recommendations.
Apply fertilizer to fields where soil test values indicate an economic response and where the soil pH is in the optimum range. If the soil pH is too high or too low, you won’t get a good return on investment. Rather, first focus on adjusting the soil pH in those fields. If the pH drifts much below 6 or much above 7, the availability of some nutrients in the soil will decrease. For example, a pH difference of 5.6 versus 6.2 can effectively reduce the value of nitrogen fertilizer by as much as 35 percent, phosphorus by as much as 50 percent and potassium by as much as 10 percent.
Lime is a key ingredient to improving soil fertility. Since water is required for lime to react with the soil, effects of a lime application will be slower in dry conditions. It often takes six months to a year before a response can be measured, even under perfect circumstances. However, a response may be observed within weeks of application when soil pH is extremely low. In areas where needed, it is important to apply lime immediately after the growing season or crop removal to allow it to react and correct soil pH before the next growing season.
Nitrogen is usually the most limiting element in forage production. This major nutrient is involved in chlorophyll development for photosynthetic activities, yield and forage quality. Nitrogen, however, requires some timing and proper manipulations to get good yields and reduce losses. Splitting N applications will reduce the risk of leaching, volatilization and nitrate toxicity.
Nitrogen-use efficiency can be significantly increased by phosphorus fertilization. Optimal soil phosphorus level should be between 30-40 ppm. If the P level is low, it could allow only 40-60 percent of total hay production. In the spring, P is a crucial nutrient in promoting the development of new roots and tillering. Phosphorous can be applied to a hay field any time of year since it is very stable and available to the plant when needed. When fertilizing annual crops, however, P should be applied before planting. Avoid spreading phosphorus fertilizer when there is risk of runoff, which is the primary way this nutrient is lost from soils.
Potassium allows plants to survive in cold weather and sustain productivity during drought. It is involved in many metabolic processes in the plant. There is a very low environmental risk with K applications. The major inefficient use of K is a phenomenon called “luxury consumption,” in which forage crops take up more K than required for optimum growth. To avoid this, K should be applied in two or more split applications during the hay season. The environmental risk posed by K is low, but care must be taken to ensure it is used efficiently.
Yes, fertilizer can be expensive, but it’s still a bargain when compared to dragging down yield and the cost of renovating perennial forage stands. Proper plant food applications will pay off in extra forage and feed for your livestock
The health and well-being of the nursing calf starts before birth with the health and nutritional status of its mother. Nutrient needs of the cow increase during the last trimester of gestation and, by the last month prior to calving, the fetus is gaining approximately 1 pound per day.
In addition to this late-term fetal growth, the cow is preparing for lactation. Research has shown cows that are thin (less than 4 body condition score) have a decreased concentration of immunoglobulins in colostrum compared to cows in a body condition score of 5 to 6. Calves born to very thin cows may be weak and slow to nurse, reducing the colostrum they consume and making them more susceptible to disease.
The newborn calf needs a healthy mother and a clean environment. Manure and mud provide an ideal environment for disease-causing bacteria and viruses. Early in the calving season, calves are exposed to these pathogens and often develop minor, undetectable infections. These young calves amplify the pathogen load in the environment faster than adult cattle do.
As the calving season progresses, newborn calves are challenged with increasingly higher levels of pathogens. Infection with high doses of bacteria or viruses combined with other risk factors such as overcrowding, temperature extremes and precipitation can quickly overwhelm calves’ defenses. Scours may develop. Long calving seasons further exacerbate the situation by providing a steady supply of new calves susceptible to infection over a long period of time.
Segregating cow-calf pairs by age of the calf has helped reduce the incidence of scours outbreaks. Older calves tend to infect younger calves. The Sandhills Calving System, developed by the University of Nebraska-Lincoln, is a system that utilizes a series of calving pastures to minimize newborn calves’ contact with disease agents. Named after the Sandhills area of north-central Nebraska where it was tested, the system prevents direct contact between younger calves and older calves and keeps later-born calves from being exposed to an accumulation of pathogens in the environment. The idea is to minimize both the disease load and newborns’ exposure to the disease agents until their immune systems have sufficiently matured to better withstand them.
Key components of the system are age-segregation of calves and the frequent movement—every seven to 10 days—of pregnant cows to clean calving pastures. Every 10 days, or whenever 100 calves are born, the herd is divided by sorting cows that had not calved from the cow-calf pairs of the preceding group. In this manner, fewer cattle groups are required, although the number of calves within any pasture group never exceeds 100, and all calves within a group are within 10 days of age of each other. After the youngest calves are 4 weeks old, all calves can be commingled.
The timing and the amount of colostrum consumption is also critical for the health of newborns. Ideally, calves need to stand and nurse within the first few hours to maximize antibody absorption and immunity. The best-case scenario occurs when a cow in good body condition gives birth to a vigorous calf in a clean environment, promptly stimulates the calf by licking it clean and the calf quickly nurses a large colostrum meal.
That first meal triggers a sequence of gut changes. To protect the calf from pathogens, the gut begins to “close” (loses its ability to take contents directly into the blood) as soon as food is introduced to the intestinal tract. As a result, fewer and fewer antibodies can be absorbed from each subsequent meal until gut closure is complete.
If a calf has nothing to eat, it can still absorb some antibodies at 24 hours, but if the calf consumes anything, gut closure begins immediately. “Anything” can be a dose of colostrum that is too small, milk replacer or debris nursed from a dirty udder or environment. Bacteria nursed from a dirty environment can be directly absorbed into the blood and cause disease.
Disease transmission is less likely if colostrum from within the herd is used. Commercial colostrum replacers are also effective and come from carefully tested herds. These products must be mixed carefully according directions. Feeding colostrum banked from neighboring herds can be effective but could increase the risk of introducing diseases. Colostrum supplements are relatively safe in terms of disease transmission but typically do not contain a high enough concentration of antibodies to guarantee adequate passive transfer. Visit with your local veterinarian when considering these options.
For pasture and hay producers, spring can be the busiest and most important season in determining this year’s plans for sustainable and profitable production. The key ingredients to your spring forage management are fertilization and weed control.
Spring growth sets the stage for your overall forage production, and applying the right amount of plant nutrients at the right time is critical. Nitrogen will boost grasses at green-up, but applications can be risky in the spring no matter what type of forage you are raising. Will it be too dry or too wet at application time? After application, will we receive rain and how much will we get? It’s hard to make decisions around these factors.
One way to manage your risk is to use nitrogen stabilizers. Products such as SuperU and Agrotain are good tools to minimize losses any time you apply nitrogen.
Soil testing should always be part of your program. Without knowing what we have, it is hard to plan for the future. MFA can handle your sampling needs with either grid or composite samples. If you are looking at increasing your stocking rates, a grid sample program will help put you on track to a profitable future.
Weed control is essential to good pasture management. Weeds compete with desirable plants. They’re generally low in feed quality, and some can be toxic to livestock. Identify and plan a control program best for your farming practice. There are many herbicides available for use on grass. This list is not exhaustive, but does include most of the frequently used products:
GrazonNext HL: This potent broadleaf weed killer is my top choice for general weed control in pastures and hay ground. No license is required to buy or use it. It is safe to use on all grasses. There are no grazing restrictions, and it has 45-90 days of residual activity.
Chaparral: This is the strongest broadleaf weed control available and has the longest list of controlled weeds. No license is required to buy or use it. Fescue is sensitive to this product, but it will recover soon after application. Chaparral has 45-90 days of residual activity. This is a dry product that mixes easily with water. It’s safe to use on all grasses, keeping the caution about fescue in mind, and there are no grazing restrictions.
Graslan L: This broadleaf herbicide is a high-load version of Grazon P+D. It requires a license. Brome is sensitive to this product, and it’s toxic to fish. Leave a buffer strip of 40 feet when approaching any waterway, pond or lake. It’s safe to use on all grasses, with the caution about brome in mind. This is the first year for Graslan L, which will replace Grazon P+D.
Remedy Ultra: This potent broadleaf herbicide also controls certain woody plants. It is often tank-mixed with a Grazon product or Tordon 22K for more broad-spectrum control. No license is required. Remedy Ultra is toxic to fish. Leave a buffer strip of 40 feet when approaching any waterway, pond or lake. It has little to no residual activity and is safe to use on all grasses.
PastureGard HL: This should be your “go to” product for fencerow and spot treatments of brush. This potent broadleaf herbicide and brush killer may cost more per gallon than similar products, but it costs less per acre. There is no license required. PastureGard HL is toxic to fish. Leave a buffer strip of 40 feet when spraying near any waterway, pond or lake. It has very little or no residual activity and is safe for use on all grasses.
Tordon 22K: This potent brush herbicide is effective on many species and controls a large number of broadleaf weeds. It requires a license to buy or use it. Use caution when spraying near any body of water. Tordon 22K has 45-90 days of residual activity and is safe for use on all grasses, although it can stunt brome.
Tordon RTU: This ready-to-use product is primarily a cut-stump treatment. Do not dilute. Tordon RTU does a good job of killing the root system and preventing resprouting of most tree species. There are no grazing restrictions for cut-stump treatments using Tordon RTU.
Here are a few other points to consider:
Always read and follow the herbicide label. It trumps anything I’ve written.
Be sure the weeds you want to control are on the label of the product you are using.
Always use Astute or Astute Extra at 1 quart per 100 gallons. This is your “spreader/sticker,” and its use is as important as using the right herbicide.
Spray when the wind is 3-10 miles per hour to avoid unwanted movement via drift.
Spray when weeds are small for best control.
Spray brush that has at least 18 months of growth.
With brush control, don’t bush hog until they are all dead. Bush hogging too early is like starting over.
Consult your local MFA agronomists. They can provide valuable insight to increase your success.
Check MFA’s Agronomy Guide for grazing restrictions and more information. If you have questions, feel free to contact me. I’m the new range and pasture specialist for MFA, taking over for David Moore who has accepted a different position with the company. My wife and I operate a small cattle farm in southwest Missouri, and I have worked for the past 17 years at the Lamar MFA Agri Services location.
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