After June 2023, reimplanting cattle with an ear implant that is not permitted for reimplantation on the label will no longer be appropriate.
As of August 2020, the U.S. Food and Drug Administration’s (FDA) Center for Veterinary Medicine (CVM) has been working to improve the consistency of new animal drug applications. The FDA CVM has recognized that some anabolic cattle ear implants may not have clear instructions on the label regarding their use for reimplanting within a production phase. The FDA CVM has issued two letters, one in May of 2021 and another in December of 2021, to inform the beef industry of its attempt to clarify reimplantation claims on cattle implant labels.
Currently, there are cattle implant labels that state the cattle implants are intended for reimplantation, and there are cattle implant labels that state the cattle implants are not intended for reimplantation within a production phase. At this time, however, there are other cattle implants that do not specify on the label whether reimplantation is approved.
The FDA CVM has set a June 2023 deadline for cattle implant manufacturers to update the labels on their cattle implants to clarify their reimplantation approval within a production phase. Therefore, after June 2023, the FDA CVM expects cattle implant labels to indicate the approval of use for reimplantation within a particular production phase and for cattle producers to follow the instructions on the label.
What does this all mean? First, the labels on cattle implants should clearly state if they are approved for reimplantation in a production phase by June 2023 so cattle producers can follow the label’s instructions. Implant labels should provide instructions for which production phase the implant is approved for (e.g., the “beef calf” phase, the “growing beef steers/heifers on pasture” phase, the “growing beef steers/heifers in a drylot” phase, or the “growing beef steers/heifers fed in confinement for slaughter” phase).
The FDA CVM has definitions of these different production phases on their website. Below is a bulleted list of some of the production phases involving younger cattle that are typically raised for beef production.
Beef calves:
• Calves nursing their dams and less than 2 months of age (pre-ruminating).
• Calves nursing their dams and greater than 2 months of age (ruminating).
Beef steers/heifers:
• Growing beef steers/heifers on pasture (e.g., stockers).
• Growing beef steers/heifers in a drylot (e.g., backgrounders).
• Growing beef steers/heifers fed in confinement for slaughter (e.g., feedlot cattle).
If the cattle implant you choose to use is not labeled for reimplant use, it may still be used again during a subsequent production phase if approved for that production phase. If the cattle implant is labeled with approval for reimplantation, that means you can readminister the cattle implant within that approved production phase.
Ambiguity may remain in the FDA CVM production phase definitions due to the housing and diet requirements, as these can vary between cattle operations. — Michigan State University Extension
