Crude glycerin levels in pearl millet-based diets for Nellore young bulls in feedlot

Abstract

-The objective of this study was to find the best level of inclusion of crude glycerin (0, 60, 120, and 240 g kg −1 of dry matter of diet) in substitution of pearl millet in a feedlot diet. Twenty-eight Nellore young bulls with mean age of 18 months and average weight of 357±23.56 kg were used. The animals were distributed in a completely randomized design with four treatments and seven replications. The intakes of dry matter, crude protein, neutral detergent fiber, and total digestible nutrients were similar among the dietary levels of crude glycerin. The ether extract intake decreased with increase in the levels of crude glycerol in the diets. Apparent digestibility of dry matter, crude protein, and extract ether was similar among the dietary crude glycerin levels. Apparent digestibility of neutral detergent fiber was lower in the diets with inclusion of crude glycerin in relation the other diets. The increase in the levels of crude glycerin did not affect the total digestible nutrients content of the diets. Average daily gain increased linearly with the increase in crude glycerin. Feed conversion was not altered by the increase in the levels of crude glycerin in the diets. The dietary increase in crude glycerin level did not affect the carcass characteristics. The inclusion of up to 240 g kg −1 of crude glycerin in pearl millet grain-based diets for feedlot-finished Nellore young bulls increases average daily gain, but does not change the main carcass characteristics of economic importance.

Physical composition of carcass, commercial cuts and meat characteristics of young bulls fed millet-based diets containing increased crude glycerin levels

“…The temperature of the carcass decreased (P < 0.05) as the chilling period increased, reaching less than 5°C after 16 h, which is the maximum recommended value to ensure the microbiological quality of the meat (DAVE; GHALY, 2011). The crude glycerin levels of the diet, in turn, did not influence (P > 0.05) the temperatures of the carcasses, which is explained by similar fat cover degree and conformation of the carcasses (MOREIRA et al, 2016). According to Klont et al (1999), heavier carcasses with higher conformation show lesser decrease in temperature, and consequently lesser pH decline, which is associated with the larger specific surface of the carcasses.…”

“…The cold carcass weights in animals fed diets containing 0, 60, 120, and 240 g of crude glycerin were 230.7, 236.9, 237.4, and 243.0 kg, respectively. Moreira et al (2016) published the productive performance results of experimental animals.…”

Crude glycerin in corn grain-based diets for dairy calves

“…Crude glycerin has been evaluated in cattle diets, and the results have indicated that there is an improvement in the average daily gain (ADG) and feed conversion (Moreira et al, 2016;Barros et al, 2018). Furthermore, the results of crude glycerin use seem to depend on diet composition (Hales et al, 2013), level of inclusion of this byproduct (Benedeti et al, 2016), and animal category (Maciel et al, 2016a;Maciel et al, 2016b).…”

Physical composition of carcass, commercial cuts and meat characteristics of crossbred Holstein-Zebu young bulls fed crude glycerin levels in the diets

“…The use of crude glycerin in animal feeding has been the target of many research studies (FRANÇOZO et al, 2013;GÓRKA et al, 2013;MOREIRA et al, 2016a). Researchers have examined the use of this by-product in cattle feeding with regard to animal performance and carcass and meat quality, but results have been contradictory (LAGE et al, 2010;FRANÇOZO et al, 2013).…”

“…Researchers have examined the use of this by-product in cattle feeding with regard to animal performance and carcass and meat quality, but results have been contradictory (LAGE et al, 2010;FRANÇOZO et al, 2013). In general, animal performance is expected to increase with the incorporation of crude glycerin because it improves energy-use efficiency, as observed by Moreira et al (2016a). However, because the inclusion of crude glycerin in ruminant diets increases the rumen production of gluconeogenic precursors (CHANJULA et al, 2014), Pethick et al (2004) suggested that total carcass fat and meat marbling are expected to increase.…”