Evaluation of Dietary Glycerin Inclusion During Different Broiler Rearing Phases

Abstract

Alternative feedstuff, biodiesel, broiler litter; nutrition, pododermatitis.Submitted: April/2016 Approved: November/2016 ABStRACtThe objective of this study was to evaluate the effect of the dietary addition of different levels of glycerin on the performance, litter moisture, pododermatitis incidence, and carcass and parts yield of broilers. In total, 1,610 broilers were reared in 35 pens with 46 birds each. A completely randomized experimental design, with five treatments with seven replicates was applied. The experimental treatments were: T1: control diet; T2: dietary inclusion of 5% glycerin from 1-42 days of age; T3: dietary inclusion of 10% glycerin from 1-42 days of age; T4: dietary inclusion of 5% glycerin from 7-42 days of age; T5: dietary inclusion of 10% glycerin from 7-42 days of age. The diets containing glycerin fed since the pre-starter period improved broiler weight gain and feed conversion ratio, but did not influence feed intake or livability. At the end of the experiment, the production efficiency index of the broilers fed 10% glycerin during the entire rearing period was significantly reduced compared with the other treatments. Litter moisture in the pens of broilers fed 10% glycerin during the entire rearing period was higher compared to the other treatments since day 21.Diets containing 10% glycerin, both for the entire rearing period (1-42 days) or only after the pre-starter phase (7-42 days), influenced broiler performance and incidence of severe pododermatitis, reducing the production efficiency indexes at 42 days. Glycerin may be added up to 5% in broiler´s diets with no effect on performance, litter moisture and carcass yield, indicating that this co-product of the biodiesel industry can be used as an alternative feedstuff for broilers.

Carcass Characteristics and Meat Quality of Betong Chicken Fed with Diets Supplemented with Crude Glycerin

“…Therefore, these results were expected, as the feed was formulated to be isonitrogenous and isocaloric diet. These findings are in agreement with the previous studies which have reported that CG inclusion up to 10% had no negative effect on carcass traits ( Sehu et al , 2012 ; Freitas et al , 2017 ) and on internal organs ( Topal and Ozdogan, 2013 ). Similarly, Arif et al (2017) and Farrapo et al (2017) also found that CG did not alter the carcass characteristics and relative organ weight of quail.…”

“…Thus, the use of CG for livestock feed is probably the cheapest alternative. Several studies have confirmed that CG could substitute corn by 5 to 10% in the chicken feed without compromising growth performance and carcass yield in broiler chicken ( Cerrate et al , 2006 ; Sehu et al , 2012 ; Topal and Ozdogan, 2013 ; Urgnani et al , 2014 ; Freitas et al , 2017 ; Da Silva et al , 2017 ; Garcia et al , 2018 ; Legawa et al , 2018 ) and meat quail ( Arif et al , 2017 ; Farrapo et al , 2017 ). Although utilization of CG in broiler nutrition is widely reported, limited information is available regarding the effect of CG on meat quality, particularly in indigenous chicken breeds.…”

Purified glycerin diets for broilers from 8 to 42 days old

“…From the results obtained, it can be inferred that the levels of inclusion of purified glycerin in the diets improved the performance of the broilers, and it is possible to affirm that the inclusion of up to 6% does not affect the performance variables. Similar results were found by Freitas et al (2017), who developed an experiment, using levels of 0, 5 and 10% of glycerin in broilers fed from 1 to 42 days, and concluded that glycerin can be used in diets up to 5% without affecting the performance of the birds.…”

“…The high costs of feeding broiler chickens has aroused interest in new alternative sources of food, which can partially replace energy and protein foods in the diet, aiming at minimizing the costs of nutrition and, consequently, production (FREITAS et al, 2017;HENZ et al, 2013;SILVA et al, 2017).…”

“…However, there is yet no clear consensus on the ideal level of food inclusion in the diets, due to the different raw materials and catalysts used to produce biodiesel, which cause excesses of some minerals that may affect its composition and limit its use in the feeding of birds (FREITAS et al, 2017;ROMANO et al, 2014).…”