Effects of Excess Methionine on Growth Performance and Blood Parameters of Peking Ducks during 7 to 28 Days of Age

XUE Jiajia, XIE Ming, TANG Jing, HUANG Wei, ZHANG Qi, HOU Shuisheng, LU Lianshui

doi:10.3969/j.issn.1006-267x.2018.08.014

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 8: 2979 - 2986

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.08.014

Molecular Nutrition

Effects of Excess Methionine on Growth Performance and Blood Parameters of Peking Ducks during 7 to 28 Days of Age

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1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
2. Chongqing Academy of Animal Sciences, Chongqing 402460, China;
3. County Agriculture Bureau of Suning in Hebei, Cangzhou 062350, China

Received date: 2018-01-15

Online published: 2018-08-18

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Abstract

This experiment was conducted to investigate the effects of excess methionine on growth performance and blood parameters of Peking ducks during 7 to 28 days of age, and to determine the maximum safe level of methionine of Peking ducks during 7 to 28 days of age. A total of 252 seven-day-old healthy male Peking ducks were randomly allotted to 6 groups with 7 replicates per group and 6 ducks per replicate according to similar pen weight. The ducks in 6 groups were fed diets with methionine levels of 0.48%, 0.73%, 0.98%, 1.23%, 1.48% and 1.73%, respectively. The diet with methionine level of 0.48% was a methionine-adequate diet for ducks. The experiment lasted for 21 days. The results showed as follows:1) compared to the dietary methionine level of 0.48%, when dietary methionine level was 0.98% or above, the final body weight (FBW), average daily gain (ADG) and average daily feed intake (ADFI) of ducks were significantly decreased (P<0.05), and the FBW, ADG and ADFI were significantly decreased with methionine level increased (P<0.05). However, there was no significant difference on the ratio of feed to gain (F/G) among six groups (P>0.05). 2) Compared to the dietary methionine level of 0.48%, when dietary methionine level was 0.98% or above, the plasma total bilirubin content was significantly increased (P<0.05); when dietary methionine level was 1.23% or above, the plasma homocysteine content was significantly increased (P<0.05), and it was significantly increased with methionine level increased (P<0.05); when dietary methionine level was 1.73%, the activities of glutamic-pyruvic transaminase and lactic dehydrogenase in plasma were significantly increased (P<0.05). 3) Compared to the dietary methionine level of 0.48%, when dietary methionine level was 0.98% or above, the blood hemoglobin content and mean corpuscular hemoglobin concentration were significantly decreased (P<0.05); when dietary methionine level was 1.23% or above, the blood mean corpuscular hemoglobin content was significantly decreased (P<0.05); when dietary methionine level was 1.48% or above, the blood red cells volume distribution width and mean corpuscular volume were significantly increased (P<0.05), while the blood red cell count was significantly decreased (P<0.05). 4) According to broken-line regression analysis, the maximum safe level of methionine for ADG in Peking ducks during 7 to 28 days of age was 0.87%. In conclusion, dietary excess methionine can inhibit the growth of Peking ducks during 7 to 28 days of age and cause in abnormal of blood parameters. The maximum safe level of methionine of Peking ducks during 7 to 28 days of age is 0.87%.

Key words： methionine; ducks; growth performance; maximum safe level; blood parameters

Cite this article

XUE Jiajia, XIE Ming, TANG Jing, HUANG Wei, ZHANG Qi, HOU Shuisheng, LU Lianshui . Effects of Excess Methionine on Growth Performance and Blood Parameters of Peking Ducks during 7 to 28 Days of Age[J]. Chinese Journal of Animal Nutrition, 2018 , 30(8) : 2979 -2986 . DOI: 10.3969/j.issn.1006-267x.2018.08.014

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