ABSTRACT

Physicochemical characteristics and lipid profile of beef from cattle feeding on grazing and feedlot were compared. Forty beef samples were collected from each feeding system. The samples were taken from the Longissimus dorsi muscle. There were no differences between the feeding systems (P > 0.05) with regard to pH, luminosity index (L*), red (a*), yellow (b*), drip loss, and cooking yield. Regarding the nutritional content, there were significant differences in moisture and fat contents (P < 0.05), but not in protein or ash content (P > 0.05). The main fatty acids found were oleic, palmitic, and stearic. There was a higher concentration of unsaturated fatty acids, especially conjugated linoleic acid, on that beef from grazing bovines (P < 0.05). This information is useful for producers in the Northeastern region of Mexico, as it can help differentiate their product from the product of other similar ecological regions in Mexico and worldwide.

摘要

比较了放牧和饲养场饲喂的牛肉的理化特性和脂质分布。从每个饲喂系统收集了40个牛肉样品。样品取自背最长肌。进料系统之间在pH值，光度指数（L *），红色（a *），黄色（b *），滴水损失和烹饪产量方面没有差异（P > 0.05）。在营养含量方面，水分和脂肪含量存在显着差异（P <0.05），而蛋白质或灰分含量则无差异（P> 0.05）。发现的主要脂肪酸为油酸，棕榈酸和硬脂酸。放牧牛的牛肉中有较高浓度的不饱和脂肪酸，尤其是共轭亚油酸（P <0.05）。该信息对于墨西哥东北地区的生产者很有用，因为它可以帮助将他们的产品与墨西哥和全世界其他类似生态地区的产品区分开。