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California Ranchers Will Need Vet's Prescription To Use Livestock Antibiotics

By Julia Mitric 
 
 
In California, ranchers already need a veterinarian's prescription for certain antibiotic treatments for livestock.
 
But a new law taking effect in January will require a prescription for all medically important antibiotics used to treat health problems in cattle, sheep and other livestock. 
 
University of California Agricultural Natural Resources farm advisor Dan Macon works with ranchers on livestock production in the northern Sacramento Valley and the Sierra foothills.
 
Macon notes the law doesn't require a vet to be on site for each animal that needs treatment. But there will need to be a veterinary-client-patient relationship.
 
As Macon explains, that means "the vet knows the operation, knows the rancher and has some idea of the types of animals and types of issues the rancher may be dealing with.
 
"And so, it does require some semi-annual check in with the vet at the ranch," he adds.
 
Macon points out that food animal veterinarians have become increasingly rare.
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Four Star Pork Industry Conf - Back to Basics: Fundamentals drive vaccine performance

Video: Four Star Pork Industry Conf - Back to Basics: Fundamentals drive vaccine performance

At a time when disease pressure continues to challenge pork production systems across the United States, vaccination remains one of the most valuable and heavily debated tools available to veterinarians and producers.

Speaking at the 2025 Four Star Pork Industry Conference in Muncie, Indiana, Dr. Daniel Gascho, veterinarian at Four Star Veterinary Service, encouraged the industry to return to fundamentals in how vaccines are selected, handled and administered across sow farms, gilt development units and grow-finish operations.

Gascho acknowledged at the outset that vaccination can quickly become a technical and sometimes tedious topic. But he said that real-world execution, not complex immunology, is where most vaccine failures occur.