Metabolizable energy values of soybean meals and soybean oil for broilers at different ages

Abstract

One trial with six analyses of different diets at different ages was carried out to determine the values of apparent (AME), corrected (AMEn), true (TME) and true corrected (TMEn) metabolizable energy of SBM and SBO for broiler chickens from 1 to 42 days of age. Three Brazilian SBM samples and one SBO were evaluated by replacing part of the basal diet with the test ingredient (300 g kg-1 for SBM and 100 g kg-1 for SBO). A total of 1.368 one-day-old male Ross 308 birds were assigned into 36 metabolic cages according to weight in a completely randomized experimental design with six replicates for each test ingredient and basal diet. Six more replicates of fasted birds were used for the determination of metabolic energy and N losses at each age. Four days of adaptation followed by three days of excreta collection for energy measurement. The birds were reared until each age, in solid floor pens with a corn/soybean basal diet. The total excreta collection method was used. The AME, AMEn, TME and TMEn of SBM and SBO increased (p < 0.05) until 28 days and after this time no difference (p >0.05) was observed.

Effects of feed particle size on energy values for broiler chickens at various ages

“…Digestive capacity was not fully developed in the younger birds and this might limit their utilization of nutrients (Mello et al, 2009). Similar results were obtained by Bertechini et al (2019), who found greater metabolizable energy values in older birds, which was related to their more developed digestive tracts. Schneiders et al (2017) evaluated soybean meal (563 µm GMD) for broiler chickens in various phases (1 -8, 11 -18, 31 -38, and 41 -48 days) and found a linear decrease in CAME with age, with values varying from 56.2% to 51.4%.…”

Effect of lipid source and emulsifier on productive and physiological parameters of broilers

“…The fact that the emulsifying agent did not affect lipase activity in the pancreas can lead to the hypothesis that this additive influences the processes of lipid digestion and absorption, such as facilitating micelle formation, indirectly enhancing the activity of lipase in the gastrointestinal tract. The energy values of DSO for broilers increased up to 21 days of age, as reported by Bertechini et al [25], which indicates the development of the digestive system up to 21 days and improvement in lipid use. Khonyoung et al [26] reported that feeding lysolecithin as an emulsifier improved broiler performance up to 21 days of age, which demonstrates that the addition of an emulsifier to broiler diets would improve the use of dietary lipids up to 21 days of age.…”