South African Journal of Animal Science
On-line version ISSN 2221-4062
Print version ISSN 0375-1589
WITT, F.H. de et al. Influence of dietary lipid sources on carcass traits of broilers. S. Afr. j. anim. sci. [online]. 2009, vol.39, n.5, pp.49-52. ISSN 2221-4062.
A study was conducted to determine the influence of different dietary lipid sources on dressing percentage, breast meat yield and breast weight of male broiler birds. Four isoenergetic (15.1 MJ AME/kg DM) and isonitrogenous (222.3 g CP/kg DM) diets were formulated, using high oleic sunflower oil (HO), sunflower oil (SO), fish oil (FO) and tallow (T) at a 60 g/kg dietary inclusion level. Four hundred, day-old Ross 788 broiler males were randomly allocated to the four treatments (n = 100) and further subdivided into four replicates/treatment (n = 25). All birds receive a standard commercial diet for the first 14 days, where-after the experimental diets were fed for another 28 days. At 42 days of age, three birds/replicate (n = 12/treatment) were randomly selected, weighed and slaughtered at a commercial abattoir. Chilled carcasses (4 ºC) were weighed to determine dressing percentage. Breast muscles were removed from the chilled carcasses, skinned and weighed for the calculation of breast meat yield. Breast meat yield were expressed as a percentage of the live body weight as well as carcass weight. This study showed that the broilers fed a diet supplemented with 60 g/kg tallow had a better dressing percentage, breast meat yield and breast weight compared to other treatments. These results suggested that dietary lipid sources could be used to improve certain carcass traits of broilers.
Keywords : Ross 788; fatty acids; dressing percentage; breast meat yield.