摘要
ABSTRACT
This study aimed to evaluate performance, gut health and metabolic changes in dairy calves receiving milk replacer supplemented with lysine and methionine with 0.6% or 1% AminoGut (10% Glutamate and 10% Glutamine). Forty-five Holstein calves were blocked and distributed in the treatments: (1) Control: no supplementation; (2) Lys, Met, AminoGut 0.6%; (3) Lys, Met, AminoGut 1%. Animals were individually housed, with free access to water and concentrate. Milk replacer (6 L/d) was fed until the eighth week of life. Feed intake and faecal score were monitored daily. Calves were weighted and measured weekly. Blood samples were collected every other week to determine metabolites. Supplementation did not affect the performance nor the metabolism of calves. There was no effect of supplementation for faecal score. An age effect was observed for most of the variables, mainly as a response of starter intake and consequent shift from a pre to a functional ruminant metabolism. The supplementation of the milk replacer with lysine and methionine in association with 0.6% or 1% AminoGut had no effect on performance, gut health nor metabolism of dairy calves. More important than the fine adjustment of amino acid requirements is the adoption of practices to improve starter intake.
摘要译文
摘要本研究旨在评估含有0.6％或1％AminoGut（10％谷氨酸和10％谷氨酰胺）的含有赖氨酸和蛋氨酸的代乳粉的奶牛犊的性能，肠道健康和代谢变化。 45只荷斯坦犊牛在治疗中被阻断和分布：（1）对照：无补充; （2）Lys，Met，AminoGut 0.6％; （3）Lys，Met，AminoGut 1％。将动物单独饲养，自由饮水和浓缩。将代乳品（6 L / d）喂养至生命的第八周。每天监测采食量和粪便评分。每周对犊牛进行加权和测量。每隔一周收集血样以确定代谢物。补充不影响小牛的表现和新陈代谢。对粪便评分没有补充效果。对于大多数变量观察到年龄效应，主要是作为起始物摄入的响应以及随后从前体转变为功能性反刍动物代谢。添加赖氨酸和蛋氨酸以及0.6％或1％AminoGut的代乳品对乳犊的性能，肠道健康和代谢没有影响。比氨基酸需求的微调更重要的是采用改善起始剂摄入量的做法。
Jackeline Thais da Silva[1];Thais Manzoni[1];Nathalia Brito Rocha[1];Glauber Santos[1];Evangelina Miqueo[1];Giovana Simão Slanzon[1];Carla Maris Machado Bittar[2]. Evaluation of milk replacer supplemented with lysine and methionine in combination with glutamate and glutamine in dairy calves[J]. Journal of Applied Animal Research, 2018,46(1): 960-966