June 2020 - National Cattlemen

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N A T I O N A L CATTLEMEN

The trusted leader and definitive voice of the beef industry June 2020 • Vol. 36, No. 8 • NCBA.org

Strategies for Parasite Control In Your Cattle Herd By Julia Herman, DVM, MS

NATIONAL CATTLEMEN’S BEEF ASSOCIATION 9110 E. NICHOLS AVENUE, SUITE 300 CENTENNIAL, CO 80112

PRSRT STD U.S. Postage PAID Denver, CO Permit No. 1673

Beef Cattle Specialist Veterinarian, NCBA, a contractor to the Beef Checkoff Cattle across the country are reaping the benefits of spring grass growth – fresh vitamins and minerals, quality nutrition, places to explore and travel, and much more. As the transition into warmer months brings such growth, it also encourages farmers and ranchers to broaden strategies for keeping their animals healthy. Parasites, both external and internal, are a challenge that can be detrimental to animal comfort and productivity. While eliminating parasites is not a realistic strategy, preparing a year-long plan to control

parasites’ negative effects on your cattle will prevent stress, improve performance, and reduce the risk of disease transmission. Parasite management varies by region with differences in climate, environmental conditions, host susceptibility, and farm/ranch management practices. To effectively treat or control parasites in the herd, it is important to know exactly which ones are a problem. This can be challenging at times, so it is important to have a resource team ready to assist. Working with your local veterinarian and extension agent will help tailor a strategy to the specific operation, using multiple modalities to protect your herd. Coordinating with neighboring ranches on parasite control would also improve overall success of the program. Common external parasites include horn flies, face flies, ticks, lice, and others. In addition to being physical irritants to livestock, these insects can be vectors of infectious disease. For instance, face flies are the major vector of Moraxella bovis which is one cause of infectious bovine keratoconjunctivitis (commonly known as pinkeye). Insecticide ear tags (fly tags) are a useful tool in fly and tick control and easy to use. Timing of applying the tags is crucial as tags placed too early will lose effectiveness and need to be replaced by midsummer. There are resistance issues developing in the horn fly population so it is also important to work with your veterinarian to ensure you are alternating the active ingredient in the fly tag every year to not promote resistance. Liquid pour-ons can be used effectively as long as the correct dose is applied for the weight of the animal. Feed-through

fly control is a feed supplement that has either an insect growth regulator compound or larvicide that is passed undigested by the animal and deposited in the manure. Both products interfere in the life cycle and control fly populations. Back rubbers, oilers, and dust bags could also be used depending on the facility setup. Choosing the correct product ingredient for the intended parasite is critically important to the success of the control program. Preventing resistance in the animal health realm can apply to both antimicrobial and antiparasitic products. Anthelmintic (or dewormer) resistance has become a real threat to prevention and control of internal parasites (i.e., worms) in livestock as decades of overuse have decreased the utility of certain classes of anthelmintics. Because of this, treatment protocols have become more complex than giving a single product and necessitate veterinary consultation. As discussed in the Checkoff-funded Beef Quality Assurance Program, proper dosing to bodyweight of the animal plays a role in effectiveness of the medication. While much focus is placed on withdrawal times for antibiotics, do not forget that many topical and injectable parasite treatments have withdrawal periods to adhere to. Beyond anthelmintics, which can be very effective when used properly, alternative methods to managing internal parasites can be effective adjunct strategies. Collecting manure samples to conduct fecal egg counts with your local veterinary clinic or diagnostic laboratory aids in monitoring parasite loads in an individual animal or herd. This can guide targeted deworming which requires some labor input

and observation of each animal but can be an effective alternative to deworming the entire herd. The focus is to selectively treat susceptible animals such as the young, stressed, or immunocompromised to remove most of the source of pasture contamination but does not risk increasing anthelmintic resistance in that worm population. This technique is used extensively in small ruminants where resistance is more prevalent. By targeting which animals get treated, it allows for a refugia to form, or a population of susceptible worms to persist in the population and remain susceptible to anthelmintic treatment in the future should it need to occur. A fecal egg count reduction test (FECRT) is the most effective method of evaluating anthelmintic effectiveness in a herd or flock and can be done in collaboration with a veterinarian. Grazing management through rotational grazing is a useful tool to improve pasture health and provide solid nutrition which improves overall animal health. More overgrazed pastures increase the risk of parasite problems since larvae from parasite eggs will contaminate overgrazed pasture and then are ingested by susceptible animals. The significance of considering the cattle’s entire environment – from optimizing nutrition, having a solid herd health program, using low stress handling, etc. to provide the foundation for a strong immune system and healthy cattle – cannot be emphasized enough. Using a multimodal approach to address parasite control is necessary to maximize benefit to both the cattle and the operation.

MARKET SNAPSHOT WEEK ENDING 5/22/2020 (prices vs. year ago) $111.40

CHOICE BOXED BEEF $459.04

OMAHA CASH CORN $2.99

5%

108%

20%

SOUTH CENTRAL 500-600 LB. STEERS $153.89

LIVE FED STEERS

6% $164.39

$116.65

$220.23

$3.72

IN THIS ISSUE Leadership Comments

3

Federation News

8

Governance 9 Market Matters

14 & 15

Checkoff 18


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