Effects of Dietary Metabolizable Energy and Lysine on Carcass Characteristics and Meat Quality in Arbor Acres Broilers

Abstract

An experiment was performed to evaluate the effects of dietary metabolizable energy (ME) and lysine on carcass characteristics and meat quality in Arbor Acres (AA) broilers from 1 to 56 days of age. A total of 2,970 1-d-old male broiler chicks were randomly allocated to nine dietary treatments (three ME levels in combination with three lysine levels), and dietary ME and lysine concentrations were formulated by varying corn, soybean meal, tallow, and L-lysine sulfate concentrations. Live body weight (BW), carcass weight (CW), dressing percent, breast muscle weight (BMW), yield of breast muscle, muscle color (CIE L*, a*, and b*), pH values 45 min and 24 h postmortem (pH 45 , and pH 24 ), meat shear force value (SFV), and water loss rate (WLR) were evaluated. Results showed that live body weight and dressing percent increased (p<0.05) as dietary energy increased. Higher dietary lysine content improved breast muscle weight. Neither carcass weight nor yield of breast muscle was affected by dietary energy or lysine content. Higher ME increased the b* value (p = 0.067) and pH 24 value (p<0.05), whereas it decreased SFV (p<0.05) and WLR (p = 0.06). Only water loss rate was influenced (p<0.01) by dietary lysine, which was higher in broilers from the high lysine diet as compared to those from medium or low lysine diets. The pH 45 value and L* value of breast muscle were not affected by ME or lysine. Significant interaction of dietary ME and lysine was found on a* value of breast muscle. These results indicated that dietary ME and lysine had important effects on breast muscle growth and meat quality, however their effects were different. Different concentrations of dietary ME and lysine might be considered to improve meat quality.

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

“…This finding, while being consistent with that of Nguyen and Bunchasak (2005), on the Thailand Betong native chicken and Magala et al (2012) on Uganda local chickens, was different from the observations of Niu et al (2009), Alabi et al (2013 on commercial broilers and Venda chicks respectively. This may be due to breed differences which have different gene encoding key regulatory factors such as hormones, enzymes and metabolic pathways (Richards and Proszkowiec-Weglarz, 2007;Tang et al, 2007). Emmans and Fisher (1986) and Emmans (1989) indicated that chickens grow based on their genetic potential; thus, they attempt to eat as much of a given feed as would be required to satisfy their growth needs.…”

Effects of low protein diet and low protein diet supplemented with synthetic essential amino acids on meat quality of broiler chickens

“…In the current study, 10 days of the ELCP diet reduced the CSA compared with the control diet. According to Tang et al (2007), a highenergy diet decreased the SFV of chicken breast muscle. The lowest mean CSA was found in the LCP group, but the SFV of the LCP group was not as low as that of the ELCP group.…”

“…Differences in energy intake could explain the SFV disparities. According to Tang et al (2007), a highenergy diet decreased the SFV of chicken breast muscle. The dietary energy intake should have been higher in the ELCP group than the other two groups because the FI of the ELCP group was higher.…”

Dietary energy level for optimum productivity and carcass characteristics of indigenous Venda chickens raised in closed confinement

“…However, the values obtained from the Venda chickens are lower than those for broiler chickens as proposed by NRC (1994). Differences in dietary energy levels for optimal feed intake between Venda and broiler chickens may be related to differences in energy requirements (NRC, 1994;Mbajiorgu 2010;Mbajiorgu et al, 2011). Tang et al (2007 reported that differences in responses to dietary energy levels might be attributed to breed differences.…”