Enables thromboxane-A synthase activity. Predicted to be involved in cellular chloride ion homeostasis; positive regulation of vasoconstriction; and prostaglandin biosynthetic process. Predicted to act upstream of or within fatty acid biosynthetic process and prostaglandin metabolic process. Predicted to be located in endoplasmic reticulum membrane. Is expressed in several structures, including bone marrow; brain; liver; lung; and metanephros. Human ortholog(s) of this gene implicated in Ghosal hematodiaphyseal syndrome; cerebral infarction; and platelet-type bleeding disorder 14. Orthologous to human TBXAS1 (thromboxane A synthase 1). [provided by Alliance of Genome Resources, Apr 2022]