Factors influencing intermuscular fat and other measures of beef chuck composition

Abstract

Carcasses from 59 steers produced from the mating of Braford, Simbrah, Senepol, and Simmental bulls to Brahman- and Romana Red-sired cows and Brahman bulls mated to Angus cows were used in this study. Effects of sire breed and feeding calves vs yearlings on fat depots in the chuck, when steers were fed to 1.0 cm external fat, were determined. Breed of sire and feeding calves vs yearlings had no effect (P greater than .05) on percentage of intermuscular fat. However, carcasses from Braford-sired steers had a higher (P less than .05) percentage of dissectable subcutaneous fat on the chuck than did those from other breed groups. Carcasses from Simmental-sired steers were superior (P less than .05) to those from Braford-sired steers in USDA yield grade and had a higher average marbling score (P less than .05) than the Simbrah-sired group. Estimated kidney, pelvic, and heart (KPH) fat was higher (P less than .05) in carcasses from Brahman-, Simbrah-, and Senepol-sired steers than in Braford-sired steers. Steers fed as calves had higher percentages (P less than .05) of KPH fat and major chuck muscles than did those fed as yearlings. The best single predictor of percentage of intermuscular fat within the chuck was adjusted fat over the ribeye (R2 = .46).

Características De La Canal en Ganado Simmental Y Simbrah en México

“…Característica GC GD GI M R AOL 0,344±0,031* 0,439±0,028* -0,252±0,043* -0,252±0,043* 0,347±0,031* GC 0,723±0,020* 0,111±0,035 0,111±0,036 0,693±0,021* GD 0,071±0,037 0,072±0,037 0,920±0,011* GI 0,990±0,001* 0,015±0,038 M 0,016±0,038 En contraste, Blanco et al (2008), al evaluar una técnica para predecir la composición de la canal in vivo, no encontraron diferencias en R, peso de la canal caliente y peso de los cortes de primera entre animales Holstein, Pinzgauer y Braunvieh. De manera similar, Christensen et al (1991), al evaluar novillos hijos de vacas Romana Roja y Brahman y de sementales Simmental, Simbrah, Senepol, Braford y Brahman, encontraron similar GI para todas las cruzas analizadas, con excepción de los novillos nacidos de sementales Brahman, cuyos promedios fueron significativamente menores al resto de los grupos genéticos.…”