Metabolizable energy of different glycerine sources derived from national biodiesel production for broilers

Abstract

Alternative feedstuffs, broilers, metabolizable energy, glycerol. ABSTRACTThe objective of the present study was to evaluate the quality of different glycerine sources produced in Brazil and to analyze their metabolizable energy levels and digestibility for broilers. Firstly, the composition of 10 samples of glycerine from different sources was analyzed. Secondly, glycerine from four different sources presenting contrasting compositions were selected to determine their metabolizable energy levels and digestibility in metabolism assays using 200 broilers between 21 and 29 days of age, applying the method of total excreta collection. The values of apparent metabolizable energy corrected for nitrogen balance of the four glycerine sources were 3145, 5026, 2828, and 2892 kcal/kg.

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

“…Broiler chickens fed a diet devoid of glycerol showed an average plasmatic concentration of 5.67 nmol of free glycerol/ml as a result of dietary lipolysis (Bernardino et al 2014). In this study, the values raised up to a mean of 14.45 nmol of free glycerol/ml in plasma in broilers fed 7% crude glycerin.…”

“…Also, glycerol-3-phosphate can be converted into dihydroxyacetone phosphate by the action of glycerol phosphate dehydrogenase and then to glucose viagluconeogenesis. The enzymes that catalyze the reactions of glycerol metabolism are tissue specific, in domestic birds glycerol kinase activity is high in liver and very low in the breast muscle (Newsholme and Taylor 1969;Bernardino et al 2014). However, glycerol phosphate dehydrogenase is active in both tissues muscle and liver (Harding et al 1975).…”

Animal performance, yield and characteristics of the meat of quail fed diets containing vegetable and mixed glycerin

“…In contrast, Bernardino et al (2014) found a linear increase in shear strength of the meat of broiler chickens with the inclusion of crude vegetable and mixed glycerin.…”

“…It is of note that meat products that are attractive to the palate cannot lose significant amounts of water during preparation to remain easy to chew and juicy. In contrast, Bernardino et al (2014) provided crude vegetable glycerin, crude mixed glycerin, and semi-purified mixed glycerin to broiler chickens and observed a 0.0457% linear reduction in water loss after cooking for every 1 g of glycerin added per kg of feed.…”

“…Glycerin is considered as a mixed compound with a variable chemical composition, and its use as a feed may result in poultry performance variation (Zavarize et al, 2014). Furthermore, the inclusion of high levels of glycerol in diets may exceed the capacity of the liver enzyme glycerol kinase, resulting in saturation of glycerol and limiting its absorption (Min et al, 2010).…”