Istasse L, Van Eenaeme C, Gabriel A, Clinquart A, Maghuin-Rogister G, Bienfait J M
Service de Nutrition, Faculté de Médecine Vétérinaire, Bruxelles, Belgium.
Vet Res Commun. 1990;14(1):19-26. doi: 10.1007/BF00346379.
Six Belgian Blue bulls (double-muscled type) and six Friesian bulls were offered a fattening diet for 34 weeks. Plasma samples were obtained once a week and also every 20 min over a 24 h period, 7 weeks before slaughter. No differences were observed between the breeds in plasma glucose, urea and free amino nitrogen concentrations, while creatinine was significantly higher in the Belgian Blue bulls. Tri-iodothyronin, tetra-iodothyronin, insulin-like growth factor 1, insulin and testosterone concentrations were higher in the Holstein group. In contrast, the Belgian Blue bulls appeared to produce more growth hormone. The slaughter weight, carcass weight, dressing percentage and proportion of lean meat were significantly higher in the Belgian Blue group. The characteristics of muscle mass (carcass weight, dressing percentage and proportion of lean meat) were positively correlated with creatinine and with the total peak area or peak amplitude of growth hormone. The insulin concentration was positively correlated with the proportion of adipose tissue in the carcass and negatively correlated with the proportion of muscle. There were no correlations between the carcass characteristics and insulin-like growth factor 1 or testosterone. No further information was provided when the ratios of the hormones were correlated with carcass characteristics.
六头比利时蓝牛（双肌型）和六头弗里斯兰公牛被投喂育肥日粮34周。在屠宰前7周，每周采集一次血浆样本，并且在24小时内每隔20分钟采集一次。两个品种在血浆葡萄糖、尿素和游离氨基酸氮浓度方面未观察到差异，而比利时蓝牛的肌酐显著更高。三碘甲状腺原氨酸、四碘甲状腺原氨酸、胰岛素样生长因子1、胰岛素和睾酮浓度在荷斯坦牛组中更高。相比之下，比利时蓝牛似乎分泌更多生长激素。比利时蓝牛组的屠宰体重、胴体重量、屠宰率和瘦肉比例显著更高。肌肉质量特征（胴体重量、屠宰率和瘦肉比例）与肌酐以及生长激素的总峰面积或峰幅度呈正相关。胰岛素浓度与胴体中脂肪组织的比例呈正相关，与肌肉比例呈负相关。胴体特征与胰岛素样生长因子1或睾酮之间没有相关性。当激素比例与胴体特征相关时，未提供进一步信息。
