The crucial role of lysine in the hepatic metabolism of growing Holstein dairy heifers as revealed by LC-MS-based untargeted metabolomics

被引:0
作者
Fanlin Kong [1 ]
Yuan Li [1 ]
Qiyu Diao [1 ]
Yanliang Bi [1 ]
Yan Tu [1 ]
机构
[1] Beijing Key Laboratory for Dairy Cow Nutrition, Sino-US Joint Lab on Nutrition and Metabolism of Ruminants, Key Laboratory of Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Institute of Feed Research, Chinese Academy of Agricultural S
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S823 [牛];
学科分类号
0905 ;
摘要
The objective of this experiment was to evaluate the effect of supplementing rumen-protected Lys based on a Lys-deficient diet on liver metabolism in growing Holstein heifers.The experiment was conducted for 3 months with 36 Holstein heifers(initial body weight:200±9.0 kg;7-month-old).Heifers were randomly assigned to 2 diets based on corn,soybean meal,alfalfa hay,and wheat bran:control,Lysdeficient diet(LD;0.66% Lys in diet),and Lys-adequate diet(LA;1.00% Lys in diet).The results showed no difference in growth performance between the 2 groups(P> 0.05).However,there was a clear trend of increasing feed conversion rate with Lys supplementation(0.05 <P <0.01).The serum urea nitrogen concentration was significantly decreased,and the aspartate aminotransferase-to-alanine aminotransferase ratio was significantly decreased by Lys supplementation(P <0.05).Moreover,growing heifers fed a Lys-adequate diet had lower levels of urine nitrogen excretion and higher levels of the biological value of nitrogen(P <0.05).Metabolomic analysis revealed that 5 types of phosphatidylcholine and 3 types of ceramide were significantly increased and enriched in sphingolipid metabolism and glycero phospholipid metabolism(P <0.05).His,Leu,and Asp levels were significantly decreased in the liver following Lys supplementation(P <0.05).In conclusion,Lys supplementation may promote the synthesis of body tissue proteins,as evidenced by significantly decreased amino acids in the liver and urine N excretion,it also improves hepatic lipid metabolism by providing lipoprotein precursors.
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页码:1152 / 1161
页数:10
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