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Choline is a vitamin-like nutrient that functions as a biological methyl donor, in various reactions in the body thus playing a major role in energy metabolism. Although it can be synthesized by most animals, it is not produced in quantities sufficient to meet their requirements; as a result, external supplementation is often required. In ruminants, choline is rapidly degraded in the rumen (Sharma and Erdman, 1989); therefore, a rumen-protected form of choline has been developed for its safe delivery to the small intestine for absorption. Rumen-protected choline (RPC) is commonly used in the diets of dairy cattle and dairy goats during the transition and early lactation periods, which are characterized by negative hormonal and energy balances, as it can prevent the development of fatty liver and improve milk yield and composition (Hartwell et al., 2000; Pinotti et al., 2008). However, the use of RPC in fattening goats has received little attention. In a recent study from Yangzhou University, ABSTRACT. The effects of rumen-protected choline (RPC) supplementation in different energy level diets on growth performance and meat quality of fattening goats were examined in this study. In total, 40 six-month-old Cashmere goats (initial body weight 24.30 ± 2.64 kg) were randomly assigned to four treatments: two different digestible energy (DE) levels (11.94 and 10.89 MJ/kg) and RPC supplement levels (0 and 0.2%). The experiment lasted for 70 days, with the first 10 days of acclimation and next 60 days of formal experimental period. It was shown that RPC supplementation in a low-energy diet improved the overall average daily feed intake, and the interaction effect of RPC×DE was highly significant between days 20 to 60 of the experiment. The overall average daily gain and feed to gain indices were not significantly affected by RPC supplementation at any energy level; however, RPC supplementation in a lowenergy diet tended to improve these indices. There were no significant effects of RPC×DE on slaughter performance, meat quality or serum biochemical indices; however, RPC supplementation resulted in lower drip loss, cook loss and shearing force, with a tendency to improve meat quality. Another positive effect of RPC supplementation was the enhancement of serum albumin and the reduction of serum urea nitrogen levels. So, it can be suggested that RPC has a greater effect on growth performance when supplemented in low-energy diets, and RPC addition can improve meat quality. Received: 25 February 2020 Revised: 13 May 2020 Accepted: 1 September 2020

Effects of rumen-protected choline supplied at different dietary energy levels on growth performance and meat quality of fattening goats