Nutrient content of carcass parts from broilers reared under cycling high temperatures
1993
Smith, M.O.
A study was conducted in which carcass parts from broilers reared under different growing temperature regimens were examined for crude protein, fat, calcium, phosphorus, potassium, and sodium. Commercial broilers were reared from 22 to 49 days of age at either 23.9 degrees C constant temperature (thermoneutral) or 23.9 to 35 degrees C cycling high temperature (heat stress). Birds in the heat stress environment were exposed to 8 h of 23.9 degrees C, 4 h of 23.9 to 35 degrees C, 4 h of 35 degrees C, and 9 h of 35 to 23.9 degrees C. Within each growth environment, protein and fat content differed among carcass parts. Protein content of thighs and drumsticks from birds grown at elevated temperatures were 10.1 and 5.3%, respectively, higher (P<.05) than those from birds grown in a constant temperature environment, but the fat content of these parts from birds in the cooler environment were higher by 8.3 and 9.4%, respectively (P<.05). There was no effect of temperature on the calcium or phosphorus content of carcass parts, but the sodium content of the breast was higher (P<.05) at elevated temperatures. The breast portion of carcasses from heat-stressed birds had the greatest (P<.05) amount of potassium.
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