Lipid metabolism of Tsaiya ducks: plasma and liver related traits underad libitum and fasting

Abstract

This study investigated related traits of lipid metabolism in plasma and liver of layer Tsaiya ducks. Each of 60 ducks was randomly allocated into an ad libitum feeding and a three‐day fasting group during the growing period (8–12 weeks old) and during the initial laying period (26–30 weeks old; 10–14 weeks from the onset of laying), respectively. Results indicated that, even under ad libitum conditions, Tsaiya ducks had high concentrations of plasma glycerol and ketone bodies. Plasma triacylglycerol (TG) contents of laying ducks were approximately seven‐fold higher than those of growing ducks. Contents of liver fat and ketone bodies, plasma phospholipid and non‐esterified fatty acid (NEFA) concentrations were higher in the laying period than in the growing period. The lipogenesis‐related traits, including blood glucose, plasma TG and phospholipid concentrations, were significantly decreased by fasting (P < 0.05). In contrast, the lipolysis‐related traits, including plasma NEFA, glycerol and ketone body concentrations, were significantly increased by fasting (P < 0.05). After fasting, body and liver weights of ducks and contents of abdominal fat and liver TG were significantly decreased (P < 0.05); conversely, concentrations of liver ketone bodies were markedly increased (P < 0.05). This study indicated that fasting depressed lipogenesis and increased lipolysis in Tsaiya ducks. In addition, in laying ducks, lipogenesis was more active than in the growing ducks. © 1999 Society of Chemical Industry

Pre- and postprandial changes in plasma hormone and metabolite levels and hepatic deiodinase activities in meal-fed broiler chickens

“…We have repeated our previous study (Buyse et al 2000) and extended it with the effect of food deprivation and the postprandial time course of changes in plasma concentrations of hormones and key metabolites and hepatic D-I and -III activities during and after refeeding. In accordance with other studies in chickens (Bacon, 1986), turkeys (Anthony et al 1990) and ducks (Lien et al 1999), food deprivation caused a significant decrease in plasma TG levels. The origin of TG in the circulation of avian species, in casu chickens, is 2-fold.…”

“…Most studies revealed an increase in plasma NEFA levels in FR poultry (e.g. Leveille et al 1975;Bacon, 1986;Lien et al 1999;Aman Yaman et al 2000). In contrast, we did not observe any differences in plasma NEFA concentrations between FR and AL chickens.…”

Carbon isotopic fractionation in eider adipose tissue varies with fatty acid structure: implications for trophic studies

“…Fasting, as well as strenuous exercise, results in increased mobilization of FFA from adipose stores into the bloodstream in both humans (Cortright et al, 1997) and birds (Lien et al, 1999;Price et al, 2008) but there are few data available to indicate the minimum time period necessary to promote this mobilization. Lien and colleagues (Lien et al, 1999;Lien and Jan, 2003) used a fasting period of 3days with Tsaiya ducks (Anas platyrhynchos var.…”

“…Lien and colleagues (Lien et al, 1999;Lien and Jan, 2003) used a fasting period of 3days with Tsaiya ducks (Anas platyrhynchos var. domestica), a larger species, while Käkelä and colleagues (Käkelä et al, 2006;Käkelä et al, 2007;Käkelä et al, 2009) used a period of 24h to ensure that portomicrons derived directly from diet were eliminated from circulation in several seabird species.…”

“…Typical fasting levels of FFA seem to vary by species and likely by body mass but are generally of the order of 20-50% that of TAG. For instance, Lien and collegues found FFA at ~25% of TAG after a 3day fast in ducks (Lien et al, 1999). With much smaller body masses of <30g, white-throated sparrows (Zonotrichia albicollis) also had FFA levels ranging from 25% to 50% that of TAG after an overnight fast of unspecified duration (Smith et al, 2007).…”