pyrimidine deoxyribonucleotide catabolic process +
pyrimidine ribonucleotide biosynthetic process +
pyrimidine ribonucleotide catabolic process +
The chemical reactions and pathways resulting in the breakdown of a pyrimidine ribonucleotide, a compound consisting of nucleoside (a pyrimidine base linked to a ribose sugar) esterified with a phosphate group at either the 3' or 5'-hydroxyl group of the sugar.