Influence of dietary energy on bird performance, carcase parts yields and nutrient composition of breast meat of heterozygous naked neck broilers reared at natural optimum and summer temperatures

Abstract

1. Heterozygous naked neck birds were raised under natural spring (average 21.2 degrees C) and summer temperatures (average 27.1 degrees C) to investigate the influence of dietary energy on broiler performance, carcase yield and nutrient composition of breast meat. 2. Birds were fed on a low energy diet of 12.12 MJ ME/kg, a medium energy diet of 12.96 MJ ME/kg and a high energy diet of 13.79 MJ ME/kg with 2 protein concentrations per energy treatment, 230 and 200 g/kg, from 0 to 3 and 3 to 7 weeks of age, respectively. 3. Summer rearing resulted in a decrease in body weight, body weight gain, carcase weight and carcase part yields of birds. 4. Increasing dietary energy from 12.12 to 13.79 MJ ME/kg increased body weight at 3 and 7 weeks, body weight gains from 0 to 3 and 3 to 7 weeks, carcase weights and relative abdominal fat weights of birds in a linear manner. There was no effect of dietary energy on the nutrient composition of breast meat. 5. It was concluded that there was no differences in dietary energy requirements of heterozygous naked neck birds when grown under natural optimum (21.2 degrees C) and summer temperatures (27.1 degrees C).

Oil and fat in broiler nutrition

“…Deaton et al (1981) used diets with similar nutritive values added with 4, 7 and 10% of animal fat, and observed that the increasing fat level of the diet increased the quantity of abdominal fat, corroborating results reported by Yalçin et al (1998).…”

Effect of dietary energy level on growth performance and morphometric parameters of local barred chickens at the starter phase

“…Furthermore, several researches have shown that growth parameters are influenced by changes in dietary energy concentration in two partially dependent pathways. Firstly, as dietary energy increases, feed efficiency is improved as less feed is taken in to satisfy the energy needs of the chickens and secondly, growth rate is promoted by increasing levels of dietary energy as reported by Plavnik et al (1997), Yalcin et al (1998) and Dublecz et al (1999).…”

Effects of Dietary Energy on Growth Performance and Carcass Quality of White Growing Pekin Ducks from Two to Six Weeks of Age

“…High dietary energy did not affect breast and leg meat (P > 0.05), but abdominal fat increased (P < 0.05) when dieatary AME was above 2,700 kcal/kg in our study (Table 3). Some researchers observed no significant effects of highenergy diets on breast meat yield of broilers (Leeson et al, 1996;Yalçin et al, 1998;Dozier et al, 2006), but increasing dietary energy could have caused deposition of excess abdominal or carcass fat in broilers (Jackson et al, 1982b;Summers et al, 1992;Leeson et al, 1996;Ghaffari et al, 2007). The use of an iso protein diet in our study may have increased ME/CP ratio of the diets, and this change may have caused excess abdominal fat in ducks, which was supported by Scott et al (1959), who observed that the carcass fat of 7.5-wk-old Pekin ducks increased as dietary ME/CP ratio increased.…”