科研之友
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摘要
The objective of this survey was to investigate qualitative and quantitative properties of meat from organic, free-range, and conventional broilers as currently provided to consumers. Fifteen broilers from 4 suppliers of each type were evaluated for raw meat yield, cooked meat yield, proximate composition, pH, color, lipid oxidation, fatty acid composition, and sensory attributes. Organic broilers yielded more dark (thigh) meat (P < 0.05) than free-range or conventional, when compared on a raw-meat basis, but conventional and free-range broilers yielded more (P < 0.05) cooked light (breast) meat than organic. Protein content of organic breast and thigh meat was greater (P < 0.05) than conventional in the raw and the cooked meat comparisons. The pH of breast meat from organic broilers was higher (P < 0.05) than free-range or conventional. Organic breast and thigh meat was less yellow (P < 0.05) than free-range or conventional. Fatty acid analysis showed that organic breasts and thighs were lower (P < 0.05) in saturated and monounsaturated fatty acids and higher (P < 0.05) in polyunsaturated fatty acids than free-range and conventional broilers. Shear force measurements were less (P < 0.05) for both breast and thigh meat from conventional broilers relative to free-range and organic broilers. Sensory panel results indicated that thighs from conventional broilers were more tender (P < 0.05) and less chewy (P < 0.05) than thighs from free-range and organic broilers, whereas other sensory properties did not differ. At the time of the study, March through May of 2006, the average retail prices for US broilers were $3.19, $2.78, and $1.29 per pound ($7.03, $6.13, and $2.84/kg) for organic, freerange, and conventional, respectively. Whereas a difference in the fatty acid composition was the largest difference observed between retail broilers in this survey, it is important to note that diets and production environments within the study were not controlled. It is apparent that the market prices for broilers at the time of this study are not fully reflected in the quantitative and qualitative measurements included in this study. It appears that consumers may be placing significant value on more intangible attributes associated with broilers marketed as organic and free-range chicken than on those attributes measured in this study.
- 出版日期2008-11
