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被称为“空中牧场”的林业饲料业,越来越引起国内外人士的兴趣和重视。全世界有森林面积38亿公顷。不少树种的枝丫、嫩枝叶等包含有叶绿素、胡萝卜素、维生素等营养成分。苏联、日本、美国等国家在利用森林采伐和木材加工废弃物制取牲畜饲料方面都取得了一定成效。苏联于1955年就成立了林业饲料研究所,进行林业饲料生产,现已形成工业体系,年利用嫩枝叶3,000万吨,枝条250万吨,绿叶20万吨,制取大量叶绿素、胡萝卜素软膏和各种膏、粉制剂,已成为禽畜饲料中不可缺少的添加剂。日本科学家将桦树枝丫用化学处理方法,生产出优质粗饲料,用来喂养奶牛、山羊等反刍家禽,效果甚好。美国
The forestry feed industry, known as “Sky Ranch,” has drawn increasing interest and attention from people both at home and abroad. The world’s forest area of 3.8 billion hectares. Many branches of tree species, such as young leaves contain chlorophyll, carotene, vitamins and other nutrients. The United States, Russia, Japan, the United States and other countries have achieved some success in making animal feed by using forest harvesting and wood processing wastes. The Soviet Union established the Institute of Feedstuffs and Fodders in 1955 to produce forestry feed. Now it has an industrial system. It uses 30 million tons of young leaves, 2.5 million tons of shoots and 200,000 tons of green leaves each year to produce a large amount of chlorophyll and carotene ointment A variety of creams, powder formulations, has become an indispensable additive in livestock feed. Japanese scientists will birch branches Ya chemical treatment methods to produce high-quality roughage, used to feed dairy cows, goats and other ruminants, the effect is very good. United States