The Thai Journal of Veterinary Medicine


The objective of this study was to compare the effect of DL-methionine (DLM) and DL-methionine hydroxy analogue (DL-MHA) supplementation on the growth performance, carcass quality, fat accumulation and lipid profile in blood of meat-type duck. Three hundred male Cherry Valley ducks were divided into 3 groups with 4 replications of 25 ducklings each. Each group was given a diet as follows: 1) basal diet, 2) basal diet + DLM, and 3) basal diet + DLMHA. The results show that dietary supplementation with DLM and DL-MHA increased body weight (P<0.01), feed intake (P<0.01) and pectoralis major (P<0.05), but decreased abdominal fat (P<0.01) when compared to the basal diet. Supplementation with DL-MHA also resulted in greater levels of triglycerides (P<0.05), low-density lipoprotein (P<0.05) and cholesterol (P<0.05) in the blood compared to the DLM group, in addition to greater levels of triglycerides (P<0.05) and high-density lipoprotein (P<0.05) compared to the basal diet. Furthermore, supplementation with DLM was shown to lower the level of plasma uric acid (P<0.05) compared to the basal diet. It is concluded that DL-MHA can promote the same productive performance in meat-type ducks as DLM, but the fat accumulation and lipid profile in blood was greater with the DL-MHA supplementation than with DLM. Furthermore, the underlying mechanism of different effects between DL-MHA and DLM on the lipid metabolism in ducks should be further investigated.

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