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首页> 外文期刊>The British Journal of Nutrition >Dietary histidine requirement to reduce the risk and severity of cataracts is higher than the requirement for growth in Atlantic salmon smolts, independently of the dietary lipid source.
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Dietary histidine requirement to reduce the risk and severity of cataracts is higher than the requirement for growth in Atlantic salmon smolts, independently of the dietary lipid source.

机译：饮食中组氨酸降低白内障的风险和严重性的要求高于大西洋鲑鲑鱼生长的要求，而与饮食中的脂质来源无关。

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摘要

The present study was carried out to investigate whether the dietary histidine requirement to reduce cataract development is higher than that for growth in Atlantic salmon smolts (Salmo salar L.) after seawater transfer and whether dietary vegetable oils contribute to cataractogenesis. Duplicate groups of salmon smolts were fed ten experimental diets with either fish oil (FO) or a vegetable oil (VO) mix replacing 70% FO and histidine at five target levels (10, 12, 14, 16 and 18 g His/kg diet) for 13 weeks after seawater transfer. The VO diet-fed fish exhibited somewhat inferior growth and feed intakes compared with the FO diet-fed fish, irrespective of the dietary histidine concentration. Both cataract prevalence and severity were negatively correlated with the dietary histidine concentration, while lens N-acetyl-histidine (NAH) concentrations were positively correlated with it. The fatty acid profiles of muscle, heart and lens reflected that of the dietary oils to a descending degree and did not affect the observed cataract development. Muscle, heart and brain histidine concentrations reflected dietary histidine concentrations, while the corresponding tissue imidazole (anserine, carnosine and NAH) concentrations appeared to saturate differently with time. The expression level of liver histidase was not affected by the dietary histidine concentration, while the liver antioxidant response was affected in the VO diet-fed fish on a transcriptional level. The lowest severity of cataracts could be achieved by feeding 13.4 g His/kg feed, independently of the dietary lipid source. However, the present study also suggests that the dietary histidine requirement to minimise the risk of cataract development is 14.4 g His/kg feed.
机译：进行本研究的目的是研究减少海水转移后饮食中减少白内障发展的组氨酸需求量是否高于生长在大西洋鲑鱼（Salmo salar L.）中的白鲑，以及饮食中植物油是否有助于白内障发生。重复鲑鱼群的十个实验日粮中添加鱼油（FO）或植物油（VO）混合物，以五个目标水平（10、12、14、16和18 g His / kg日粮代替70％FO和组氨酸） ）在海水转移后的13周内。与FO饮食喂养的鱼相比，VO饮食喂养的鱼表现出的生长和饲料摄入量略低，而与饮食中组氨酸的浓度无关。白内障患病率和严重程度与饮食中组氨酸浓度呈负相关，而晶状体N-乙酰基组氨酸（NAH）浓度与饮食中组氨酸呈正相关。肌肉，心脏和晶状体的脂肪酸谱在一定程度上反映了膳食油的脂肪酸谱，并且不影响观察到的白内障发展。肌肉，心脏和大脑中的组氨酸浓度反映了饮食中的组氨酸浓度，而相应的组织咪唑（鸟氨酸，肌肽和NAH）浓度则随时间而饱和。肝脏组氨酸酶的表达水平不受日粮中组氨酸浓度的影响，而肝脏抗氧化反应在转录水平上受VO日粮喂养的鱼的影响。白内障的最低严重性可以通过喂食13.4 g His / kg饲料来实现，而与饮食中的脂质来源无关。但是，本研究还表明，使白内障发生风险最小化的饮食组氨酸需求量为14.4 g His / kg饲料。

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