Performance and Ruminal Parameters of Boer Crossbred Goats Fed Diets that Contain Crude Glycerin

Abstract

Simple SummaryThere is an increasing interest in the use of by-products, such as crude glycerin in animal feeding, and many studies emphasize that the addition of these ingredients can reduce feed costs, avoid environmental problems, and serve as good energy sources for ruminants. However, there is little information available on the replacement of ground corn with crude glycerin in goat diets. We analyzed the effects of replacing corn with crude glycerin up to 150 g/kg of diet on feed intake and growth performance of goats. This substitution reduced consumption, digestibility, and performance.AbstractThis study aimed to evaluate the effects of four levels of crude glycerin (0, 50, 100, or 150 g/kg on a dry matter basis) on intake, digestibility, production performance, and ruminal parameters for finishing Boer crossbred goats. Thirty-two crossbred, castrated Boer × undefined breed goat kids, with an initial average weight of 17.8 ± 2.2 kg and approximately four months old, were distributed in a completely randomized design, with four treatments and eight repetitions. The dry matter and neutral detergent fiber intakes, both in g/day and percent of body weight, linearly decreased (p ≤ 0.05) with increased inclusion levels of crude glycerin in the diet. The dietary crude glycerin levels linearly decreased (p ≤ 0.01) the digestibility coefficients of ether extract and quadratically increased (p = 0.04) digestibility coefficients of neutral detergent fiber. The final weight, total weight gain, and average daily gain for the animals showed a linear decrease (p ≤ 0.02) as dietary crude glycerin levels increased. The addition of crude glycerin caused a linear increase in ruminal pH (p ≤ 0.01), which ranged from 6.27 to 6.49 for diets with 0 and 150 g/kg crude glycerin, respectively. The concentration of ruminal NH3–N exhibited a linear decrease as the crude glycerin inclusion levels increased (p ≤ 0.01). Total short-chain fatty acid (SCFA) concentration, individual molar ratio, and the acetate: Propionate ratio in the ruminal fluid of the animals were not influenced (p ≥ 0.07) by the dietary crude glycerin levels. These data indicate that crude glycerin should not be used to replace ground corn in the diets of growing goats that are finished in a feedlot because the substitution reduces the intake and digestibility of several nutrients and decreases performance.

A 1.1 Mb duplication CNV on chromosome 17 contributes to skeletal muscle development in Boer goats

“…Because of its broad ecological adaptability, it has been widely introduced in many countries for the hybrid genetic improvement of native goats ( Marques et al, 2021 ; Ncube et al, 2022 ; Pérez-Baena et al, 2021 ). Many researchers have explored its meat quality ( van Wyk et al, 2022 ), feeding mode ( Pérez-Baena et al, 2021 ), and reproductive performance ( Bezerra et al, 2019 ; Kholif et al, 2020 ), as well as the molecular basis of muscle development, coat color, and environmental adaptation ( Chaosap et al, 2020 ; Shakweer & El-Rahman, 2020 ; Wang et al, 2019b ; Xiong et al, 2020 ). However, the genetic basis for its superior muscle growth remains poorly understood.…”

Effect of Short-Term Glycerin Supplementation on Follicle Dynamics and Pregnancy Rate in Goats

“…Part of the ingested glycerol is absorbed directly by the ruminal epithelium, metabolized in the liver, and directed toward gluconeogenesis by glycerol kinase, which converts it into glucose. Therefore, from a glucogenic perspective, the inclusion of crude glycerin increases the glucogenic potential of the diet [15]. Furthermore, another fraction of glycerol can be fermented and converted into volatile fatty acids; mainly propionate, which is the main precursor of gluconeogenesis in the liver and provides energy for cellular metabolism [16].…”

Glicerol en el comportamiento productivo y características de la canal y carne de cabras: un metaanálisis

“…Sin embargo, existen discrepancias entre los hallazgos publicados en la literatura científica, principalmente debido al nivel y pureza del glicerol y la etapa de producción de los animales (Kholif, 2019). Tal es así que glicerina bruta de baja pureza no se recomienda para reemplazar al maíz en la dieta de cabras porque reduce el consumo y la digestibilidad de varias fracciones nutricionales y disminuye el rendimiento de la canal (Bezerra et al, 2019), pero glicerina bruta de 91.62% de pureza (glicerol) no afecta las características de la carcasa (Matos et al, 2018). Asimismo, AbuGhazaleh et al…”