By Russ Daly
Providing pain control and analgesia following surgical procedures is becoming more commonly accepted – and requested – by producers for their food animals. That was one of the messages brought to veterinarians by Dr. Bob Streeter, a veterinary clinician from Oklahoma State University, at the 2018 James Bailey Herd Health Conference, held February 10, 2018 on the SDSU campus.
Common Uses
Common procedures such as castration and dehorning have long been considered potentially painful for animals, but only relatively recently have there been products available for veterinary use to reduce pain associated with these surgeries. Streeter explained that there are some benefits to the presence of pain: it’s the physiologic response that makes the animal protect an injured part of the body, for example. When pain becomes chronic, however, many adverse effects on the animal have been documented, including impaired immune, cardiovascular, digestive, and neurologic functions. Furthermore, for some animals, the physical and psychological stimulation present during some painful conditions can wind itself up to the point where severe stress sets in.
Veterinarians commonly use medications to preempt pain in surgical situations. One of the most common examples is the use of local anesthetics to block nerves when preparing for surgery such as a C-section or displaced abomasum correction. However, local anesthetics are increasingly being used by veterinarians prior to more minor surgeries such as dehorning and castration.
In a similar manner, analgesia that will tamp down pain for hours or days following the procedure is also becoming more accepted. Administering medications such as flunixin or meloxicam to an animal after surgery or a minor procedure is akin to giving a person aspirin or ibuprofen for pain relief.
Barriers & Challenges
Even though the benefits of pain relief for food animals have been increasingly well-documented, barriers to their use still exist. These include drug residues, cost, worker efficiency, routes of administration, and availability of the medications. Since these treatments are applied to food animals, the risk of drug residues is a serious consideration. Veterinarians are usually able to use these medications under extra-label drug use provisions, but it is then up to them to determine an appropriate slaughter (or even milk) withdrawal to implement.
A major stumbling block for many producers and veterinarians is that giving a local nerve block or administering pain medication represents extra work steps and slows down the processing of large numbers of animals. As time goes on, however, veterinarians are devising ways of more quickly blocking horns (use of automatically-refilling syringes for local anesthetics, for example) and administering pills in the course of chutework. The release onto the market of a transdermal (pour-on) non-steroidal analgesic for cattle may hold promise for even more efficient treatment with pain relievers.
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