粗放養殖 的英文怎麼說
中文拼音 [cūfàngyǎngzhí]
粗放養殖
英文
extensive fish culture-
As one of the contracted agricultural technology extension project in shanxi province, the jinnan cattle feeding and management technical package exte nsion project, assigned by science and technology committee of shanxi province i n 1999, directed on the problems, such as extensive cattle feeding and managemen t, low sale percentage of commercial beef cattle, low meat production, low repro ductive survive rate of cows and poor economic returns, to increase the scientif ic contents and economic returns of cattle industry by adopting technical packag e including beef cattle crossbreeding, beef cattle feeding and management, cow ' s feeding and nutrition, calf raising, stover processing, and supplementation for grazing cattle in winter and spring etc
「晉南牛飼養管理配套技術推廣」是山西省科委1999年度下達「山西省農村技術承包」項目，其目的是針對我區廣大農戶養牛飼養管理粗放、商品牛出欄率低、產肉率低、母牛繁殖成活率低、經濟效益差等缺點，通過採用肉牛雜交改良、改良肉牛飼養管理、加強母牛飼料營養、犢牛培育、秸稈氨化、放牧牛冬春補飼等配套技術，達到提高養牛業科技含量，增加養牛業經濟效益的目的。Now, the general tendency in the world freshwater fish breeding field is : the change from " extensive " to " intensive ". but in our country, the actuality of freshwater fish breeding is : low unit production rate little economic benefit severe pollution bad sustainability
世界淡水養殖業「由粗放型向集約型轉變」的總趨勢，引出了對我國淡水養殖業「單位產量低、效益低、污染嚴重、可持續性差」 ? ?這一現狀的思考。
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