Influence of source and level of glycerin in the diet on growth performance, liver characteristics, and nutrient digestibility in broilers from hatching to 21 days of age

Abstract

The influence of source and level of inclusion of raw glycerin (GLYC) in the diet on growth performance, digestive traits, total tract apparent retention (TTAR), and apparent ileal digestibility of nutrients was studied in broilers from 1 to 21 d of age. There was a control diet based on corn and soybean meal and 8 additional diets that formed a 2 × 4 factorial with 2 sources of GLYC and 4 levels of inclusion (2.5, 5.0, 7.5, and 10%). The GLYC used were obtained from the same original batch of soy oil that was dried under different processing conditions and contained 87.5 or 81.6% glycerol, respectively. Type of processing of the GLYC did not affect any of the variables studied except DM and organic matter retention (P < 0.05) that was higher for the 87.5% glycerol diet. From d 1 to 21, feed conversion ratio (FCR) improved linearly (L, P ≤ 0.01) as the GLYC content of the diet increased, but ADG was not affected. On d 21, the relative weight (% BW) of the liver and the digestive tract increased (L, P < 0.01) as the level of GLYC in the diet increased, but lipid concentration in the liver was not affected. The TTAR of DM and organic matter increased quadratically (Q, P < 0.05) and the AME(n) content of the diet increased linearly (L, P < 0.01) with increases in dietary GLYC. Also, the apparent ileal digestibility of DM (L, P < 0.05; Q, P = 0.07) and gross energy (L, P < 0.01) increased as the GLYC content of the diet increased. It is concluded that raw GLYC from the biodiesel industry can be used efficiently, up to 10% of the diet, as a source of energy for broilers from 1 to 21 d of age and that the energy content of well-processed raw GLYC depends primarily on its glycerol content.

Evaluation of Dietary Glycerin Inclusion During Different Broiler Rearing Phases

“…In addition, consistent with studies evaluating the addition of increasing glycerin levels (up to 10%) in broiler diets (Zavarize et al, 2012;Menten et al, 2008;Fernandes et al, 2010), no negative effect of the inclusion of up to 8% of glycerin was detected on broiler performance, suggesting that glycerin can be included in broiler diets, provided its chemical composition. Mandalawi et al 2014 showed that raw glycerin from the biodiesel industry can be used efficiently, up to 10% of the diet, as a source of energy for broilers from 1 to 21 days of age and that the energy content of well-processed raw glycerin depends primarily on its glycerol content. However, when high glycerin levels were added to the diet (20 and 25%), Simon et al (1997) performance impairment was observed.…”

Impact of increasing crude glycerine levels in diet on growth, carcass traits, body measurements and blood cholesterol in growing Japanese quails

“…Results of the present study are in line with the findings of Bernardino et al (2015) who noticed that including crude glycerine in diets improved FCR in broilers and concluded that this was due to the low concentration of methanol (20.62 mg · l −1 ) in glycerine preparation. Furthermore, Mandalawi et al (2014) stated that FCR improved with glycerine addition in broiler diets from 1 to 21 day of age. Contradictive results were obtained by Cerrate et al (2006) who demonstrated that glycerine had no impact on FCR in poultry.…”

“…Moreover, higher levels of glycerine (12 and 15%) resulted in lower weight gains, and increasing crude glycerine level quadratically increased feed intake at 10 days of age. Mandalawi et al (2014) investigated the effects of different glycerine sources and levels in broiler diets. A 2×2 factorial design was used with four levels of inclusion (2.5, 5, 7.5 and 10%), along with two sources of glycerine.…”

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

“…Raw glycerin, a coproduct of the ethanol industry, is an attractive energy source that can replace part of the cereal grain in poultry diets and contribute to reduce feed cost (Lammers et al, 2008;Swiatkiewicz and Koreleski, 2009;Mandalawi et al, 2014).…”

“…The maximum level of inclusion of GLYC in laying hen diets for optimal production, has been estimated within the range of 50 to 100 g/kg (Lammers et al, 2008;Swiatkiewicz and Koreleski, 2009;Németh et al, 2013). Also, the inclusion of GLYC in broiler diets increased dry matter (DM) and gross energy (GE) retention (Kim et al, 2013;Mandalawi et al, 2014). In spite of the commercial interest for using GLYC as an energy source in the diet, little information is available on the effects of GLYC on total tract apparent retention (TTAR) of dietary components and egg quality in laying hens.…”