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炼钢时,如果加进少许锰,钢会变得更坚硬和有韧性.胎儿在生长发育时,除了供给充足的蛋白质、维生素、铁、钙等营养物质外,如果也能保证供给足够的锰,就会使软骨组织、神经组织等生长良好.胎儿生长发育所需要的锰只能靠母体提供,一旦母体锰的供给不足,胎儿就会缺锰,这种现象在妊娠的最后三个月时表现得最为明显.1937年,有人首次给母鸡喂以
When steel is made, if a little manganese is added, the steel will be harder and more resilient. In addition to supplying enough protein, vitamins, iron, calcium and other nutrients when the fetus is growing, it is also guaranteed to supply enough manganese , Will make the cartilage tissue, nerve tissue, etc. Growth of the fetus required for the growth and development of manganese can only be provided by the mother, once the supply of maternal manganese insufficiency, the fetus will be lack of manganese, this phenomenon in the last three months of pregnancy The most obvious performance in 1937, the first time for hen feed