The energy value of biodiesel glycerine products fed to broilers at different ages

Abstract

The objective of this study was to determine the apparent metabolisable energy corrected for nitrogen balance (AMEn) of some products containing glycerine from soybean oil (GOIL), a mixture of frying oil and lard (GMIX) and a semi-purified process (GSP) in broilers of different ages (10, 20, 30 and 40 days post-hatching), using two methodologies. In trial 1, the basal diets were replaced with 100 g/kg of each studied glycerine product and the diets were supplied ad libitum. Three hundred broilers were used in five replicates, with five, four, three and three animals per cage in each age group, respectively. The AMEn was calculated for each experimental unit. In trial 2, dietary treatments included the addition of glycerine at 0, 40, 80 or 120 g/kg for each crude glycerine product, with 900 broilers in six replicates, using the same number of animals per cage as described in trial 1. Depending on the experimental unit, the feeding was restricted in 88%, 92%, 96% and 100% of estimated intake according to the Cobb guide. The AMEn was determined using linear regression between the feed intake and the AMEn of each diet. In both trials, the total excreta collection method was used. Because of the chemical composition, GMIX was not considered crude glycerine. The mean AMEn values of the products were 20.55 MJ/kg, 15.80 MJ/kg and 15.05 MJ/kg for GMIX, GSP and GOIL, respectively. There was a linear decrease (p < 0.01) in the AMEn values with the increasing age of the broilers. Numerically, it was observed that the AMEn values decreased until 28-30 day post-hatching and then remained constant until the finishing phase. It is concluded that products containing glycerine can be used as an energy source for broilers, but that AMEn values can vary according to age. Younger broilers have a higher capacity of energy utilisation from these feedstuffs.

Activity of glutamate dehydrogenase and protein content in the breast of broilers fed diets containing different sources and levels of glycerine

“…For the formulation of diets, the mean values of apparent metabolizable energy corrected for the retained nitrogen (AMEn) that had been previously determined by Lima et al. () for each evaluated glycerine were utilized: 13.73 MJ AMEn/kg CGSO, 13.51 MJ AMEn/kg MCG and 13.83 MJ AMEn/kg SPGSO.…”

Influence of the inclusion of co-products of the soy oil industry in poultry diets on nutrient digestibility, growth performance, and production

“…Results from chapter 2 of the present thesis indicate that the AMEn content of glycerol close to 96% of the GE of a product containing 81-87% glycerol, less than 0.4% free fatty acids, 5% ash, 0.06% methanol and less than 10% water. This estimation is close to the predictive value of 97% of the GE obtained by Kerr et al (2011) for glycerol containing less than 0.5% free fatty acids, but higher than the range of 86.0 to 92% reported by Lima et al (2013) in products with lower glycerin and higher fat residues. Differences in the composition of the fat residue, might explain the lower values reported by these authors.…”

“…5 The interaction between source and level of glycerin was not significant (P > 0.10). The inclusion of up to 10% GLYC in the diet improved growth performance of the broilers with effects being more pronounced for FCR than for ADG and for the first week of life than thereafter, consistent with data of Lima et al (2013) who reported that young broilers have a higher capacity to utilize the energy content from this ingredient than older broilers. Mclea et al (2011) and Topal and Ozdogan (2013) reported also that the inclusion of 8 to 10% glycerol in the diet improved ADG and FCR in broilers from 1 to 28 d of age, in agreement with the results of the current experiment.…”

The effect of replacing soya bean oil with glycerol in diets on performance, egg quality and egg fatty acid composition in laying hens

“…Due to the importance of glycerol in energy metabolism and its high availability due to biodiesel production, its inclusion in animal diets has generated interest. Several authors have shown that glycerine has a high energy value for poultry (Lammers et al, 2008;Dozier et al, 2011;Jung and Batal, 2011;Lima et al, 2013), regardless of compositional differences resulting from fat sources, processing methods and reagents used for biodiesel production. Lammers et al (2008), in metabolism experiments, used 48 Hy-Line W-36 laying hens, fed 0%, 5%, 10% and 15% crude glycerol in their ration and found an apparent metabolisable energy (ME) value of 15.92 MJ/kg (3805 kcal/kg).…”