Animal feed is the biggest cost for most cattle producers. In the United States, the cost of hay, grains and other feed has risen sharply because of a drought. At the same time, wildfires this year burned more than a million hectares of North American rangeland.
Jack Field raises cattle in the northwestern state of Washington. To save money, he made plans to truck his small herd of cows three hundred kilometers to feed on crop stubble. Crop stubble is what remains after crops have been harvested.
Moving his cattle from farm to farm costs money and time. But he says if he can avoid feeding them hay, he can still make a profit.
Tim DelCurto is a beef scientist at Oregon State University. He is working with ranchers and feedlot owners to help them find lower cost ways to feed cattle. He says cattle can eat things like grass-seed straw and distillers grains. These grains are left over from ethanol fuel production.
He says cattle can also eat cannery waste and items rejected by vegetable processors -- like misshapen green beans, carrots, even French fries.
"Now I think one of the unique attributes of beef cattle -- and sheep would fit this, too -- is that they can virtually digest anything."
The rising cost of feed has led agricultural research universities to give greater attention to what experts call "feed efficiency." The University of Idaho has a cattle barn where sensors measure exactly how much food each cow eats.
Professor Rod Hill says just because animals are growing at the same rate does not mean they eat the same amount of food. In fact the difference in how efficiently their bodies convert feed into meat, fat, bone and hide might be surprising.
"These animals are -- for your eye and mine -- they look quite homogenous. But the variation in intake for animals growing at the same rate is of the order of thirty-five percent."
This is a case where humans and animals have something in common.
"You know, we talk to people who say, 'All I have to do is, is, is look at the candy store and, and I put on three pounds.' We don't actually quantify it so precisely in humans, but we know in humans that some people can eat a little and they can put on quite a bit of weight and some people can eat a lot and hardly put on any weight. So it's a biological phenomenon."
Rod Hill says ranchers can use selective breeding to get the same growth with less feed. But he says not to focus too much on one thing, like reducing fat.
"Less-efficient animals are slightly fatter, and more-efficient animals are slightly leaner. So we wouldn't want to just go after efficiency and then forget about the body composition. So, we wouldn't want animals to become too lean, so that might reduce marbling in the product, especially in the quality cuts where the profit is."
中国人和美国人之间的误解
4岁!他却已经游历1万7千英里 走遍41个国家
最鼓舞人心的名言
过年最怕亲戚问这10个问题 中招了么
电子烟在男子口中爆炸 牙齿被炸飞
全球最佳国家排名:德国第1中国17
听说常化妆的人才懂这19个词汇 你get了么
测一测:你的语法拼得过7岁孩子吗?
名家建议:10个永不过时的写作技巧
把喵星人当萌宠这事 中国人在5千年前就做了
人类牙齿有望像鲨鱼牙齿一样可以再生
中国互联网初创企业投资热或将消退
你先看到鸭子还是兔?一张图测试大脑转速
中国人赴日抢购纸尿裤
Apple Pay登陆中国了 微信支付宝有对手了!
让你每天精力充沛的十大方法
万万没想到:原来红薯这么有营养!
如何用形状来推测你的容忍度
研究:厨房越乱,吃得越多
这只汪乱入马拉松就算了 居然还拿了名次!
不变的春节 渐变的年俗
这小哥自拍有毒!镜头里有比他更抢镜的……
我是自带杀气的猫 愚蠢的人类不准靠近我!
94%旅游达人都答不出的竞猜题:你敢来试吗
最适合练口语的5部脱口秀
如何用一个密码管理所有的密码
最小背包客 3月大的她比你去过的国家多多了
万万没想到:英语里表达情绪的词竟然这么少
瘦不下来?你一直搞错了运动和吃饭的时机!
囧研究:灵魂伴侣真的存在吗?
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |