Fly Fighting

Written by Dr. Jim White on .

Flies cause substantial economical losses to cattle producers; e.g., biting flies carry diseases such as anaplasmosis and bovine leukosis virus. Face flies can spread pinkeye from animal to animal. Flies are well adapted to the environment. They have been around for thousands of years and are doing very well for themselves. The adaptability of flies means that it is going to be impossible to completely remove them from your operation. However, there are ways to control flies and to lessen their negative impact.

1. FEED AN INSECT GROWTH REGULATOR. These are either Altosid to treat horn flies on pastured cattle, or Clarifly for confinement cattle. Clarifly has a claim for face flies in addition to horn flies. Clarifly costs about twice as much to use compared to Altosid, but it gets twice the fly species. The pesticide should be fed starting 30 days before flies typically appear, and should be continued for 30 days after a killing frost. This roughly means feeding it between March 15 to Nov. 15. While horn flies don’t travel far, face flies will travel up to two miles.

2. USE FLY TAGS. Newer-generation fly tags are quite useful in controlling fly populations. To reduce pyrethroid resistance, after using pyrethroid tags for two consecutive years, switch to an organo-phosphate tag for one year. For optimal fly control, many products require two tags for an adult animal and one tag for a calf. As always, whenever you are using a pesticide follow the label directions. Applying the tags too early will be result in less effective fly control. The ideal time to apply tags is when there are about 200 horn flies per cow. The best time to check this is in the early morning hours: it is cooler, and the wind tends to be down. Look at the animals as they graze, it is relatively easy to see the flies on their sides.

3. USE POUR-ONS. You can apply a pour-on at the same time you flytag your cattle. If you are doing this during spring turnout time, you can use a product that kills internal parasites, these products are also effective against flies. If you do this later in the year, use products that are just labeled for flies and/or lice.

4. PROVIDE DUST BAGS/CATTLE RUBS. If you place a dust bag or rub at a site where all cattle use it, and keep it charged with insecticide, it can provide a very economical means of controlling face and horn flies.

5. SPRAY CATTLE. If you use a spray product on your cattle at timely intervals it can be very effective at reducing the fly population. Though useful, this method can be time-consuming.

When working on controlling flies and lessening their damage to your cattle, it is unlikely that one strategy alone will be sufficient. When you use several methods in conjunction, you are better able to lessen the negative impact of flies. If grass tetany is a concern, use Mag- Ade Meal IGR-CTC. If you offer free-choice mineral and want to minimize problems, feed Ricochet FESQ Max CTC-Alt. If you need a fescue equalizer, feed Fescue Equalizer CTC-Alt.

Horn flies cost the American cattle industry a couple of million dollars every day. Horn flies are about half the length of a house fly. Both males and females are blood feeders and congregate on the shoulders and backs of cattle. When disturbed, horn flies will fly up in a swarm, but they will return to animals almost immediately. Females leave occasionally to lay their eggs in fresh manure piles.

The close association between horn flies and host helps with control. The flies leave animals only to lay eggs or to change hosts. Thus many methods will expose flies to control practices (ear tags, topical products, feed-through feed additives). With some chemistries (pyrethroids), insect resistance has been an issue. Resistance is not a problem when using IGR-insect growth regulator, chemical name S-methoprene; there is no known resistance to IGR-methoprene-Altosid. The appropriate application of an IGR feed-through product is that the horn fly control is long-term and preventive, not reactive. IGR is ingested as part of the animal’s feed. Cattle then excrete manure which has IGR. Given that horn flies must lay their eggs in fresh manure, the IGR is there to keep the horn fly pupae from developing into breeding, biting adult horn flies.

Ricochet FESQ Max CTC-Alt is a convenient, ready-to-use mineral formulated to balance range or pasture feeding programs for beef cattle. The inclusion of IGR and CTC allows for both horn fly control and medicated feed claims.

6 steps for a successful lambing or kidding season

Written by Dr. Tom Earlywine on .

The health, growth and early performance of a lamb or kid crop directly impacts future performance in the milking parlor, pasture or showring. As a result, long-term successes can be driven by success during the lambing and kidding season.

Nutrition is essential in giving lambs and kids a solid start. High quality milk replacer can be a solution to success; however, success is not guaranteed on milk replacer alone. Here is a look at six steps to a successful total management program shared at the 2015 Dairy Sheep Association of North America Symposium.

1. Set obtainable goals

Before the first lamb hits the ground, analyze past performance of the flock, set tangible goals and determine a path for achieving these goals. Consider a 200 percent lamb or kid crop as an attainable goal. Mature and well-conditioned ewes and does should be able to lamb at least two lambs or kids. Strive for less than 5 percent pre-weaning mortality. The industry target is less than 5 percent, but it’s estimated that 20 percent of lambs are lost before weaning, with 80 percent of those losses in the first 10 days.

2. Provide newborn care

Within the first few minutes after a lamb or kid is born, they are exposed to bacteria and pathogens. Two ways to protect against these pathogens are navel disinfection and quality colostrum.

Dip the newborn’s navel in 7 percent tincture of iodine immediately after birth. Make sure the disinfectant covers both the outside and inside of the navel.

Colostrum or the first milk in lactation is the primary protection newborns receive against environmental pathogens and bacteria. Lambs and kids should receive 10 percent of their body weight in colostrum by 18 hours of age, fed at 105 degrees F. For example, a 10-pound lamb should be fed 1 pound or 16 ounces of colostrum in the first 18 hours of its life.

Keep in mind that fluctuations in colostrum quality and quantity are probable; a colostrum replacement can be used to ensure all lambs and kids receive a high-quality, disease-free colostrum.

3. Select a species-specific milk replacer

After newborns are fed high-quality colostrum or colostrum replacer for the first feeding, they can be transitioned to a milk replacer.

Look for a milk replacer made specifically for lambs or kids. Many options of milk replacer may be available to you, but calves, lambs, kids, pigs, alpacas, puppies and kittens all have different nutrient requirements. Milk replacers formulated for lambs are better able to provide the nutrients lambs require because they closely mimic the composition of ewe’s milk. The same is true with kid-specific milk replacers for kid goats.

4. Choose the right feeding system

Bottle feeding, free-choice feeding or an automated system are the three primary means of feeding lambs and kids on milk replacer.

Select which system is the best fit by considering the facilities, size of operation, labor situation and performance objectives. Make sure the system provides enough nutrition so lambs and kids at least triple their birth weight by 28 days of age. Clean and disinfect the system as often as possible.

5. Stimulate rumen development

The rumen is the main site for nutrient breakdown. Absorption in mature ruminants and in other species has been highly correlated to health and performance of the animal.

When a lamb or kid is born, the rumen is not fully developed and neither are the papillae inside the rumen. Growth of the rumen papillae and rumen development can be correlated with what the lamb or kid eats pre-weaning.

If the rumen is not developed appropriately, weaning can be delayed or unsuccessful. Water is a critical ingredient in the development of bacterial growth and the beginning of rumen fermentation. Always provide free choice water.

6. Promote a smooth weaning transition

Lambs and kids are ready for weaning when they consume an equivalent of 1.5 percent of their body weight in high-quality creep feed along with adequate water. Usually this will occur near 30 days of age or 35 pounds of weight. At weaning time, each lamb should have consumed at least 25 pounds of lamb milk replacer powder.

Follow these steps to weaning:

  • Plan weaning protocol, timing and facilities 14 to 21 days prior to weaning.
  • Ensure animals are consuming creep feed and utilizing water.
  • Gradually remove milk replacer or remove ewe.
  • Feed a high protein ration (18 to 25 percent crude protein).

Following these six steps provides a total management system for successfully raising lambs or kids, especially when on milk replacer. Setting goals, providing a high-quality colostrum and milk replacer, comfortable housing, and ready access to high quality feed and water will help lambs and kids thrive.

Stocker health is stocker profit

Written by Dr. Jim White on .

Stocker cattle health has always been a challenge, but the challenge seems to have increased over the years. We have some of the best vaccines and technology, but the mortality number has continued to rise.

Any number of things can influence stocker calf health. I have been told by backgrounders that the feed I formulate doesn’t influence calf health nearly as much as other variables. They tell me where the calves come from is important. How they were previously managed, weaned, bought and transported is a big factor. And how they were managed when received is important, too. Somewhere in the discussion, I usually try to point out that Cattle Charge really does help get calves off to a good start.

While variables other than feed are important in the health risk equation, the feed/ration that formulated is of absolute significance to how the calf will perform as soon as they hit the facility. For example, with long-haul, weaned-on-the-truck calves, the first few days is very important to offer a highly palatable and nutrient-dense pellet/ration that will compensate for low intake. Getting them to eat and having sound bunk management is absolutely key to prop up immunity status of the calf. You can have the best vaccination protocol, but if the calves do not eat a fully fortified/balanced diet for the expected intake, any amount of vaccine/medicine will not work as expected.

The vaccine to use will depend on the targeted pathogen, as well as the complexity of where the pathogen resides in the calf and the level of protection that can come from the vaccine. Your veterinarian should make specific vaccine recommendations based on your operation, the risk level of your cattle, and the past disease issues they have experienced.

The real cost of sick calves is reduced performance and death loss, not the cost of medication. Yes, some medications are expensive upfront costs, but the cost of poor performance or losing a calf is greater. Whittling away at costs of medication is to lose focus on the real cost—one dead calf buys a lot of medicine.

If you bring calves to the farm and don’t have a detailed knowledge of what you are bringing in, you’ll have little control over how they were weaned. You won’t know vaccination history or the what exposure to pathogens the animals have had. Nor will you know how they were handled, sold or transported. Somewhere in this discussion, I usually try to point out that buying Health Track calves assures you of previous management, ability to handle stress and generally improved performance.

Regardless of where you get backgrounders, it is important to match the available resources to the calves once they are settled and go onto grass or the backgrounding yard. The objective is to manage for performance.

If the calves are on a pasture, forage allocation/stocking rate is key. Animal performance will tend to improve as forage availability increases, but only up to a point. And increasing stocking rate tends to increase pounds of gain per acre, but only up to a point. The right forage availability/stocking rate depends on forage production, forage quality, cost inputs and value of weight gain.

Calves on a forage base will need to be supplemented. They will need added protein if the forage base is corn silage. They will need energy if the forage base is cool-season grass. Supplementing energy to energy-short forage rations improves calf performance and improves efficiency of feed utilization. In all situations their performance can be improved with feeding an approved feed additive—ionophores such as Rumensin or Bovatec and fly control when needed. If you do not feed a supplement, at least feed a mineral. Feeding mineral on pastured calves usually shows about a 0.25-pound improvement in average daily gain for calves compared to calves without access to mineral. Feeding an ionophore is worth about 0.2 pounds of average daily gain.

Consider using implants when feasible. In feeder cattle, estrogenic growth-promoting implants improve feed efficiency and daily gain 5 to 15 percent. Implants that include TBA can provide an additional 3 to 5 percent improvement in feed efficiency and daily gain. A good re-implant program can sustain implant-associated performance beyond the payout that would be expected for a single implant. If you are looking for a high quality grade, the most important thing is to never have an implant dosage that exceeds what the caloric intake can support at any stage of production. If they are eating enough to gain 3.5 lbs per day, that boost is 0.5 lbs per day. If they have enough calories to gain 1.5 lbs per day, the improvement is only 0.15 lbs. When the implant is going full-tilt and the calories aren’t there is what may negatively impact grade potential. Proper implant administration can improve the response to implanting. Proper use of disinfectants, using sharp needles, and proper placement are important. The principal problems of getting it wrong will be abscesses and crushed or missing implants. While some implants come with antibiotics, this is not a substitute for good implanting technique.

At weaning, calves not intended for breeding should be implanted with a “feeder”, or low-to moderate-potency implant. The feeder implant can be either an estrogenic implant or a combination estrogenic/TBA implant.

It is important to finish the feeding period with the most potent implant selected in the implanting program. Therefore, if a combination estrogenic/TBA implant is selected as the first implant, it should be used again in subsequent implantings. If an estrogenic implant without TBA is selected as the first implant, a similar product or an estrogenic/TBA implant can be selected for subsequent implanting.

You can delay implanting if the days on implant program do not fit with the expected days on feed. If the animals are high risk, implanting them increases nutrient requirements when their intake is already low.

Delaying implanting 20 to 30 days after they are placed in the feedlot has proven effective. For example, if a group of calves arrives at the feedlot weighing 500 pounds, and the expected days on feed to reach market weight is 240 days, delaying 30 days would allow for use of two implants rather than three.

Cold weather and cows

Written by Dr. Jim White on .

By the time you see this, the world-famous weather prognosticating groundhog Punxsutawney Phil has trundled out to do his job. We’re either in for six more weeks of winter or not. Regardless of what the rodent indicates, weather records tell us that it’s about the coldest time of year. And that means spring-calving beef cows are getting close to dropping calves.

For feeding plans, that means its important to remember that the days just before Christmas, when cows were in mid-gestation and had lower nutrient requirements, are gone. In these cold, pre-calving days, there are a couple of things that certainly require attention: 1) how weather affects the cow’s nutrient needs; 2) barns and their proper ventilation. If you’re calving outdoors, on pasture or in the woods, lack of ventilation obviously is less of an issue. It’s excessive ventilation that you’re worried about.

When cattle are in an environment where they do not need to spend energy to warm themselves (cold stress) or cool themselves (heat stress), they enjoy what is called the thermoneutral zone. The colder end of the thermoneutral zone is the “lower critical temperature.” At points below this effective temperature, a cow requires additional energy to maintain its body temperature. If cows have a dry winter coat, the threshold at which they begin spending energy to stay warm is considered 32º F.

As a general rule, when the ambient temperature drops below the lower critical temperature, cattle will experience a 1 percent increase in energy requirement for each degree the temperature, or wind chill, drops below 32º F.

As an example, if it is 26º out with no wind and a cow is dry, she will require a 6 percent increase in energy requirements (32º - 26º = 6). If you are unable to protect the cow from getting wet, the math can get ugly. A wet coat increases the lower critical temperature to 60º. A cow outside in sleet at 26º suffers a 34 percent increase in required energy (60º - 26º = 34). And because her coat is wet, instead of every degree raising the energy requirement by 1 percent, it goes to 2 percent. Her energy requirements are fully two thirds higher when wet. She can not eat enough feed to maintain her weight.

The best that can be done from a feed perspective is to increase the amount of dietary energy available to cattle during cold weather. The most direct way to increase energy is to add concentrate/ionophores to the diet. In a pinch you can allocate your hay supply, saving higher energy hay for colder times of the year. Or saving it for expected wet periods. You’ll have to make the call depending on your hay supply and weather conditions. Regardless, protecting cattle from adverse weather conditions drastically influences the animal’s feed needs and reduces your feed bill.

Temperature is not the only factor to consider. Earlier in my career, I worked in Iowa, where we worried more about air quality for cattle enclosed in barns. Up there, ensuring adequate air exchange was a critical issue. In tight barns, adequate air exchange is required to control humidity, condensation and ammonia levels. Poorly ventilated barns typically increased health challenges for the herd.

In a peaked-roof barn, the simple solution is to make sure there is an open ridge at the peak. The opening allows warmer, moisture-laden air to rise up and out of the barn. The concept applies to mono-slope barns as well. An opening high in the barn allows warm air to carry moisture out.

The trick is to allow for good air exchange without causing cold drafts. In my experience, it is better to minimize barn humidity than maximize barn temperature. You should protect cattle from the weather, but not at the expense of air quality.

Another factor to consider in winter feeding is the cow’s protein requirement. While protein requirements won’t increase in the drastic manner that energy requirements do, feeding protein is still important in winter. A cow needs protein for her growth, maintenance and fetal development if she is gestating. Moreover, rumen function is influenced by nitrogen/crude protein. Nitrogen/protein deficiencies cause reduced fiber digestion, which tends to amplify energy deficiencies during adverse weather conditions. When forage digestibility is reduced, forage intake will be limited.

More in the Feb 2016 Issue of Today's Farmer Magazine



Supplement poor forage

Written by Dr. Jim White on .

Feeding a protein supplement maintains animal performance

About every year there are periods when the forage on hand isn’t high enough quality or in adequate quantity to meet your cow herd’s needs. You can’t be sure just which time of year, but you can count on challenges from pasture dormancy, drought, pest infestations, blizzards, all things that can make you operation short on the energy component of feed.

Of course, as a beef producer, it warms your heart to see cows out making a living grazing forages—just turning grass into beef without interventions from management or your checking account. But that warm heart sometimes gets in the way of cold business sense. You will usually benefit economically by correcting nutrient deficiencies sooner than later. For example before you begin to see body condition losses. Doing so substantially improves animal performance. And poor animal performance gets into the checkbook, too. Poor performance from a deficit in energy for your herd leads to decreased conception in cows; reduction in milk production and lactation length; loss of body condition scores; and reduction in fetal growth.

It can also bring on a reduced tolerance to stress, which invites disease, parasites and calving challenges.

Addressing forage/energy deficiency can be tedious. A straightforward solution is to feed a supplement which is low in protein and high in energy. Corn, for example. You can supplement the additional energy in a number of ways: tubs, blocks, liquid, cubes, pellets, mash, etc.

Your cost will vary. And your herd’s potential for shrink and the ease of handling will vary. Fundamentally the objective is to get supplemental feed that directly addresses the limiting factors in the cows’ diet. Of course, you have to consider your labor costs, time and delivery options. These are too often ignored to the detriment of your payday. Still, if you study the economics of these factors are combined with the a range of feed nutrient values, you can find the best value for the money. For example, a 20-percent protein hay might have a lower unit-of-energy cost and/or protein cost than a supplement tub. But, if you are driving 50 miles to do chores, tubs make a lot of sense.

Also consider how the cows will handle the diet. Ruminal forage digestibility can be reduced when high starch levels are introduced to the diet.

Fiber digestibility increases as an all-forage diet increases in starch. Fiber digestibility reaches a peak/plateau at about 0.25 percent of bodyweight. If you are feeding corn, that means feeding 0.375 percent of body weight to get to the right spot. At higher levels, the energy concentration increases, but the fiber digestibility declines. At ever higher levels of grain, this becomes less of an issue because the amount of forage in the diet is dropping.

However, one concern with lower forage digestibility is that the rate of passage through the animal will take a lot longer.

In turn, the rumen fills with forage that can’t be pushed through the system fast enough for adequate forage to be consumed. You can help the process by mechanically chopping the forage.

Another constraint to forage digestibility can be a forage with a low crude protein content. When forage protein is below 8 percent, the protein/nitrogen in the rumen can limit rumen bacteria growth, which in turns limits forage digestibility. The rumen microbial population needs adequate nitrogen to function well. They get that nitrogen from protein/nitrogen feeds. Therefore, adding a protein supplement to the diet can increase forage intake in many cases and alleviate or reduce the energy deficiency problem. This is particularly the case where your forage inventory is abundant but slightly high in fiber and low in protein. Controlled studies indicate that the intake of lower quality forage can be increased 20 to 60 percent, and forage digestibility can be increased by 5 to 15 percent by supplementing rumen-available protein.


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