Abstract
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.
Highlights
In Mexico, beef production is one of the main activities within the animal production industry, and during 2017, said activity generated approximately 6.75 billion dollars
The aim of the present study was to determine the physicochemical characteristics, nutritional content, fatty acid profile, and conjugated linoleic acid (CLA) concentration of beef from grazing and feedlot systems in northeastern Mexico in order to generate information that will benefit the production of beef with nutraceutical characteristics
To determine the diet and meat fatty acid (FA) profile, methylation of the samples was performed according to the technique proposed by Palmquist and Jenkins (2003), where the FA are presented as methyl esters
Summary
In Mexico, beef production is one of the main activities within the animal production industry, and during 2017, said activity generated approximately 6.75 billion dollars. Producing under grazing conditions has the advantages of lower production costs, animal welfare, and beef with nutraceutical properties The latter is important when considering the growing demand for healthy foodstuffs, derived from the increase of diseases such as cancer, diabetes, obesity, and cardiovascular problems, which are related to poor eating habits (Daley, Abbott, Doyle, Nader, & Larson, 2010). The latter is especially important issue in Mexico, because the country has severe problems regarding child and adult obesity (Shamah-Levy et al, 2018). An FA of particular interest is conjugated linoleic acid (CLA), given its potential beneficial effect
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