Evaluation of biochemical parameters and genetic markers for association with meat tenderness in South African feedlot cattle.

摘要: A large proportion of South African feedlot cattle are crossbreds Brahman (BrX, Bos indicus), and Simmental (SiX, taurus). sample 20 grain fed bulls from each these crossbreeds was used to compare meat quality with that the small frame indigenous Nguni (NgX, Sanga) by evaluating a variety biochemical genetic parameters previously shown be associated tenderness. Shear force values were generally high (5.6 kg average at 14 days post mortem), SiX animals higher than BrX or NgX (P = 0.051) despite calpastatin:calpain ratio in < 0.05). Calpain activity cold shortening both correlated tenderness for all classes. The size too accurately estimate genotypic effects published markers CAST CAPN1 genes, but allele frequencies suggest only modest progress would possible using markers.