Nutrient Content of Carcass Parts from Broilers Reared Under Cycling High Temperatures

Abstract

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 C constant temperature (thermoneutral) or 23.9 to 35 C cycling high temperature (heat stress). Birds in the heat stress environment were exposed to 8 h of 23.9 C, 4 h of 23.9 to 35 C, 4 h of 35 C, and 9 h of 35 to 23.9 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. (

Effects of Dietary Supplementation with Epigallocatechin Gallate on Meat Quality and Muscle Antioxidant Capacity of Broilers Subjected to Acute Heat Stress

“…In this experiment, broilers undergoing AHS treatment at 33 °C for 12 h displayed a significant reduction in the eviscerated percentage. Smith [ 23 ] found that the dry matter contents of carcass parts (breast and thigh) were significantly decreased by elevated environmental temperature, but the contents of Na (breast) and K (back, breast, drumstick, and thigh) were significantly increased, indicating that elevated environmental temperature may decrease the organic matter contents in the carcass of broilers, which may partly explain why hot environmental temperature decreased the eviscerated carcass percentage. Excitingly, we found that adding EGCG to the diet can significantly reduce the negative effects of AHS on the eviscerated carcass percentage.…”

Effects of methionine source, arginine: lysine ratio and sodium chloride level in the diets of grower broilers reared under high-temperature conditions

“…Prime cuts yield included whole breast yield (with skin and bones) and leg yield (thighs and drumsticks with bones and skin), also calculated relative eviscerated carcass weight. The abdominal fat around the cloaca, cloacal bursa, gizzard, proventriculus and adjacent abdominal muscles was removed and weighed, as described by Smith (1993).…”

Evaluation of Potassium Chlodride and Ascorbic Acid as Anti-Heat Stress Agents in Broiler Chicks

“…As general inference, birds of HS-S environment had significantly (P0.05) less values of carcass, thighs and wing weights and dressing percentage and significantly (P0.05) heavier inedible weight than those of HS-M environment (Table , 2). The reports indicated that heat stress increased breast muscles percentages (Leenstra and Cahaner, 1992), reduced thighs weight (Smith, 1993) or decreased abdominal fat (ELDeeb and Abou-Elmagd, 2001). The reduction of thighs weight in the present study under severe heat stress (HS-S) agreed with Smith (1993).…”

“…The reports indicated that heat stress increased breast muscles percentages (Leenstra and Cahaner, 1992), reduced thighs weight (Smith, 1993) or decreased abdominal fat (ELDeeb and Abou-Elmagd, 2001). The reduction of thighs weight in the present study under severe heat stress (HS-S) agreed with Smith (1993). The reduction of carcass weight and dressing percentages were in agreement with the results of BWT (Table , 1).…”

“…The magnitude of high environmental temperature are detrimental to the growth, feed intake and feed conversion of broilers (Chwalibog, 1990). Heat stress was found to affect also the nutrient deposition in bird's body, consequently, changing carcass characteristics and composition (Smith, 1993). The physiological changes that occur during exposure to chronic heat stress in acid-base balance, mineral balance, respiration rate and body temperature were thought to be responsible for the above mentioned effects first two weeks of age.…”