Absence of carcass defects after commercial extremes in dietary CP and ME minimizes broiler formulation as a welfare concern
نویسنده
چکیده
Defects associated with broiler carcasses were used to reveal adverse welfare when dietary CP and ME varied. Chicks were reared sexes-separate in floor pens from 0 to 42 days of age on common feeds. During the subsequent 42-56 days, feeds having CP at either 18.0 or 16.5% while ME was either 3250 or 3090 kcal / kg were given. All feeds either attained or exceeded minimum nutrient requirements. At 56 days, feed was withheld 12 hours, and birds processed using automated equipment. Warm carcasses were static chilled in slush-ice for 4 hours then one person evaluated the incidence of: wings having dislocated joints, bruising, broken bones, and brachial veins expressing extra-vascular blood; drumsticks with broken bones and bruising; breast bruising and broken clavicles; and back-thigh area having bruising, torn skin and scratching, Wing bruising was the defect having the greatest incidence (19.0%) and breast bruising the least (0.4%). Males exhibited a greater vascular disruption of blood in the wing veins, broken drumsticks and back bruising than females while the converse occurred for drumstick bruising and skin tearing of back-thigh area (P<.05). No significant effects were detected that could be attributable to level of CP and/or ME (P>.05). Absence of carcass defects associated with wide variations in feed CP and ME levels infer a minimal threat to broiler welfare that could be attributed to normal variations of these nutrients. ________________________________________________________________________
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