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Farm & Ranch

Cattle Nematodes (Worms)

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Barry Whitworth, DVM | Senior Extension Specialist | Department of Animal & Food Sciences

According to the Mesonet, Oklahoma received some much-needed rain in late April (2023). With the moderate temperatures and high humidity, the environment is perfect for the proliferation of gastrointestinal nematodes (GIN) which are commonly called “worms.” Cattle can be infected with a variety of GIN. Most do not cause issues unless husbandry practices are poor. However certain GIN have been associated with disease. The most pathological GIN in cattle is Ostertagia ostertagi. Cooperia species and Haemonchus species are two that have been implicated with production issues. Control of these parasites is constantly changing due to environment, anthelmintic (dewormer) resistance, and consumer preference. Cattle producers should develop a plan to manage these parasites. 

In order for GIN to complete their life cycle, certain environmental conditions must exist. The development stage begins with passing of the egg in the feces of the animal. If the egg is to hatch, the temperature must be warm and the humidity needs to be close to 100%. Ideal temperature ranges from 70⁰ to 80⁰ Fahrenheit (F), but any temperature above 45⁰ F will allow for development. Temperatures above 85⁰ F or below 45⁰ F will begin to hamper development. Humidity needs to be 80% or higher.

Once the egg hatches, the larva goes through a couple of molts to reach the infective stage which is the third stage larva (L3). L3 must have moisture to free itself from the fecal pat. Once free, it rides a wave of water on to a blade of forage. Once ingested, this begins the prepatent or pre-adult stage. Two molts take place during this stage (L3 to L4 and L4 to L5). If conditions are not favorable for survivability of offspring, L4 will go into an arrested development stage (hypobiosis) for a period of time. The patent or adult stage is the mature breeding adult.

Once inside the body, the parasite will migrate to certain locations in the digestive tract. For example, O. ostertagi develop in the gastric gland in the abomasum. H. placei and H. contortus will migrate to the abomasum. Cooperia species will live in the small intestine. A few like Trichuris (whipworms) are found in the large intestine.

Clinical signs of parasitism vary according to the species of parasite, burden, and site of attachment. Severe disease, which is referred to as parasitic gastroenteritis (PGE), with internal parasites is unusual with today’s control methods. Clinical signs of PGE are lack of appetite, weight loss, weakness, diarrhea, submandibular edema (bottle jaw), and death. However, most parasite infection are subclinical which means producers do not see clinical signs of disease. In subclinical infections, the parasite causes production issues such as poor weight gain in young cattle, reduced milk production, and lower pregnancy rates.  

Producers should be monitoring their herds for parasites throughout the year but especially in the spring when conditions are ideal for infection. A fecal egg count (FEC) is a good way of accessing parasite burdens. Livestock producers need to gather fecal samples from their herd periodically. The samples should be sent to their veterinarian or a veterinary diagnostic lab. Different techniques are used to access the number of eggs per gram of feces. Based on the counts, the producer will learn the parasite burden of the herd. Producers can use this information to develop a treatment plan.

 In the past, GIN control was simple. Cattle were routinely dewormed. Unfortunately, anthelmintic resistance has complicated parasite control. Now proper nutrition, grazing management, a general understanding of how weather influences parasites, biosecurity, refugia, anthelmintic efficiency, and the judicious use of anthelmintics are important in designing an effective parasite management program. All of these considerations need to be discussed in detail with a producer’s veterinarian when developing a plan for their operation.

Cattle producers need to understand that parasites cannot be eliminated. They must be managed with a variety of control methods. Designing a parasite management plan requires producers to gain a general understanding of life cycle of the parasite as well as the environmental needs of the parasite. Producers should use this information as well as consult with their veterinarian for a plan to manage GIN. For more information about GIN, producers should talk with their veterinarian and/or with their local Oklahoma State University Cooperative Extension Agriculture Educator.

References

Charlier, J., Höglund, J., Morgan, E. R., Geldhof, P., Vercruysse, J., & Claerebout, E. (2020). Biology and Epidemiology of Gastrointestinal Nematodes in Cattle. The Veterinary clinics of North America. Food animal practice36(1), 1–15.

Navarre C. B. (2020). Epidemiology and Control of Gastrointestinal Nematodes of Cattle in Southern Climates. The Veterinary clinics of North America. Food animal practice36(1), 45–57.

Urquhart, G. M., Armour, J., Duncan, J. L., Dunn, A. M., & Jennings, F. W. (1987). In G. M. Urquhart (Ed). Veterinary Helminthology. Veterinary Parasitology (1st ed., pp 3-33). Longman Scientific & Technical.

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Farm & Ranch

Beef Quality Assurance: A Commitment to Cattle, Consumers, and the Future

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Barry Whitworth, DVM, MPH
Senior Extension Specialist/State BQA Coordinator

Department of Animal & Food Sciences | Ferguson College of Agriculture | Oklahoma State University

According to one survey, Beef Quality Assurance (BQA) is the most successful rancher educational program in the United States. In Oklahoma, BQA is a joint effort of the Oklahoma Beef Council, Oklahoma State University Cooperative Extension Service, and the OSU Department of Animal and Food Sciences. This Beef Checkoff-funded program helps cattle producers raise healthy cattle while providing consumers with a healthy, safe, wholesome product.

BQA is a voluntary certification program that provides cattle producers with science-based guidelines for animal husbandry, herd health, and food safety. Launched in the 1980s, BQA helps producers adopt best management practices that reduce residues, prevent defects in carcasses, and improve the overall quality of beef. This not only benefits producers but also builds consumer confidence.

The objectives of BQA are to provide hands on training to help cattle producers meet BQA expectations as well as realize the benefits of being BQA certified. BQA emphasizes record keeping that meets or exceeds government guidelines. BQA participants are provided with technical assistance from BQA staff, veterinarians, extension specialists, and others. Lastly, BQA provides a foundation for responsible cattle management.

To improve beef quality, BQA applies principles from the Hazard Analysis Critical Control Points (HACCP)program. This system helps producers identify key control points in beef production where management practices can prevent problems before they occur. Preventing issues at the source not only protects consumers but also makes economic sense for producers.

The BQA program addresses a wide range of management practices such as cattle care, herd health, biosecurity, nutrition, record keeping, transportation, environmental stewardship, worker safety, and emergency action planning. Emphasizing these results in better outcomes for cattle as well as producers. To find other areas where improvement should be made, BQA relies on the National Beef Quality Audits (NBQA). These audits are conducted roughly every five years on feeder steers and heifers and cull cows and bulls. The audits can be viewed at www.bqa.org.

Beef cattle producers have different options for certification. The option of certification depends on what phase of the beef cattle production cycle producers identify with. One certification program is related to cow/calf production for those who breed and sell calves. Another program deals with stocker/backgrounder operations for those that raise and sell feeder cattle, and lastly, feeder operators can be feedyard certified. Even those individuals that haul cattle can be BQA certified in transportation.

BQA trainings can be done online at bqa.org or in-person trainings occur across the state of Oklahoma throughout the year. For in-person training, producers should contact their local Oklahoma State University Cooperative Extension County office for more information.

BQA certifications are valid for three years from the date of the original certification. To renew a certification, a producer must obtain three hours of continuing educational (CE) courses before their BQA certification expires. CE courses are available at bqa.org or can be obtained through OSU Extension programs.

BQA certification demonstrates to consumers that beef cattle are raised with care, respect, and responsibility. By following BQA guidelines, producers can improve herd health, reduce losses, and increase consumer demand for beef. In short, BQA is both good business and the right thing to do.

For more information about BQA, cattle producers should visit the BQA website at www.bqa.org or contact their local Oklahoma State University Cooperative County Extension office.

References

Klopatek, S. C., Cantwell, A. M., Roche, L., Stackhouse-Lawson, K., & Oltjen, J. W. (2022). Beef Quality Assurance national rancher survey: program participation, best management practices, and motivations for joining future sustainability programs. Translational animal science6(3), txac094.

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Farm & Ranch

The Life Cycle of a Show Steer: An Introduction

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For many livestock exhibitors in Oklahoma, the Oklahoma Youth Expo is always top of mind. As the highly anticipated event approaches, I couldn’t think of a better time to introduce my new seven-part series, The Life Cycle of a Show Steer.

Growing up in the livestock industry—raising, selling, and exhibiting market steers—I’ve been immersed in this world for as long as I can remember. As a kid, I hosted “steer shows” in my living room, dragging a stuffed calf around while begging my mom to judge (not to brag, but I won every time). Recognizing my passion early on, my dad handed me a real show halter at just three years old. Since then, I’ve had the privilege of competing at shows across the country, from the Sioux Empire Livestock Show to the National Western Stock Show and Rodeo.

While winning at national events was unforgettable—especially covering my steer in glitter for the Sioux Empire Sale of Champions and standing on the green carpet in Denver—nothing compares to the limo ride tradition at the Oklahoma Youth Expo. In 2022, my steer, Tarzan, was named breed champion All Other Breeds (AOB), but the journey to that moment was long and full of hard work.

Throughout this series, I’ll take you behind the scenes of what it takes to prepare a steer for his final show, using Tarzan’s story as a guide. From selecting genetics to the emotional final days at the show, I’ll cover every stage of the process.

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Farm & Ranch

Why Body Condition is Important in the Cow Herd

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By Marty New

Body condition scores of beef cows at the time of calving have the greatest impact on subsequent rebreeding performance.

One of the major constraints in the improvement of reproductive efficiency is the duration of the post-calving anestrous period. If cows are to maintain a calving interval of one year, they must conceive within 80 days to 85 days after calving. Calving intervals in excess of 12 months are often caused by nutritional stress at some point, which results in thin body condition and poor reproductive performance.

Research has shown mature and young cows that maintain body weight have ample energy reserves before parturition, exhibited estrus sooner than cows that lost considerable body weight and consequently had poor energy reserves. Body weight change during pregnancy is confounded with embryo and placenta growth. Therefore, the estimation of body fat by use of body condition scores is more useful in quantifying the energy status of beef cows. The system of body condition scoring is an excellent estimator of percentage of body fat in beef cows.

The processes of fetal development, delivering a calf, milk production and repair of the reproductive tract are all physiological stresses. These stresses require availability and utilization of large quantities of energy to enable cows to be rebred in the required 85 days.

Added to physiological stresses are the environmental stresses of cold, wet weather on spring calving cows. In normal cow diets, energy intake will be below the amount needed to maintain body weight and condition. As the intake falls short of the energy utilized, the cow compensates by mobilizing stored energy and over a period of several weeks, a noticeable change in the outward appearance of the cow takes place.

Cows that have a thin body condition at calving return to estrus slowly. Postpartum increases in energy intake can modify the length of the postpartum interval. However, increases in the quality and quantity of feed to increase postpartum body condition can be very expensive. Improvement in reproductive performance achieved by expensive postpartum feeding to thin cows may not be adequate to justify the cost of the additional nutrients.

The influence of nutrition before calving is a major factor that controls the length of time between calving and the return to estrus. Thin cows with a BCS score of four or less at calving produce less colostrum as well as give birth to less vigorous calves that are slower to stand.

The impact of quality and quantity of colostrum will effect these calves’ immunoglobulin levels, thus harming their ability to overcome early calf-hood disease challenges. It is much easier to increase condition in cows before rather than after they calve. High nutrition after calving is directed first toward milk production. Feeding cows to gain condition early in lactation therefore leads to increased milk production but has little effect on body condition.

Cows prior to calving and through breeding should have a BCS of five or higher to have good reproductive performance. First-calf heifers should have a BCS of six. Spring-calving cows are still consuming harvested forages and lactating will generally lose one BCS following calving.

Over-stocking pastures is a common cause of poor body condition and reproductive failure. Proper stocking, year-round mineral supplementation and timely use of protein supplement offer potential for economically improving body condition score and reproductive performance.

An efficient way to utilize BCS involves sorting cows by condition 90 to 100 days prior to calving. Feed each group to have condition scores of five to six at calving. These would be logical scores for achieving maximum reproductive performance while holding supplemental feed costs to a minimum.

Body condition scoring has allowed cattlemen to continually evaluate their nutritional program. By evaluating cow condition at strategic times of the year, it is possible to coordinate use of the forage resource with nutritional needs of the cow herd so supplemental feed and hay needs are reduced to a minimum.

This article originally appeared in the February 2016 issue of Oklahoma Farm & Ranch. 

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