Objective—To determine the effects of florfenicol
injection on the meat characteristics of the cervical
muscles in cattle.
Animals—100 steers (mean weight, 380 kg).
Procedure—In 50 calves, florfenicol (25 ml, twice)
was injected into the cervical muscles of 1 side of the
neck, and saline (0.9% NaCl) solution (25 ml, twice)
was injected into the cervical muscles of the other
side of the neck. In the remaining 50 calves, florfenicol
was injected into the cervical muscles of 1 side of
the neck, and nothing was injected into the cervical
muscles of the other side of the neck. Animals were
slaughtered 132 days later, and samples of the cervical
muscles were submitted for histologic evaluation
and measurement of shear forces.
Results—2 injection sites used in the present study
had extensive lesions, and both of these were sites
where florfenicol had been injected. However, histologic
scores for the florfenicol injection sites were not
significantly different from scores for the contralateral
saline solution injection sites and uninjected control
sites. In addition, shear force values were not significantly
different between sites in which florfenicol had
been injected and the contralateral sites.
Conclusion and Clinical Relevance—Results suggest
that few reactions should be expected with
injection of florfenicol into the cervical muscles in
steers and that reactions that do occur will consist
mainly of fibrosis and infiltration of adipose tissue.
However, shear force values, a measure of tenderness
of the meat, should not be affected. (Am J Vet