The effect of betaine and dl-methionine on growth performance and carcass characteristics in meat ducks

By Yan Wang, Zi-rong Xu, Jie Feng. 2004

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Growth, Carcass Quality and Serum Constituents of Slow Growing Chicks as Affected by Betaine Addition to Diets Containing 2. Different Levels of Methionine (2005, background): “Betaine has an energysparing role by reducing maintenance requirement of the pig (Schrama and Gerrits, 2000), and improves growth, carcass yields and muscle protein (Virtanen and Rosi, 1995; Esteve- Garcia and Mack, 2000; Türker et al., 2004 and Wang et al., 2004).”
Metabolic, Osmoregulatory and Nutritional Functions of Betaine in Monogastric Animals (2009, background): “Some studies revealed that betaine could be as effective as methionine in promoting growth and feed efficiency in broilers (Pesti et al., 1979; Zhan et al., 2006) and starter ducks (1-21 d) (Wang et al., 2004) fed diets marginally deficient in methionine.”