文档介绍：对肥育猪饲喂高纤维日粮的隐含本钱
Producers are paid more money for leaner pigs 猪长得瘦，养猪者就可多赚钱
Do they want more lean meat or less fat?
他们究竟是要多些瘦肉呢还是要少些脂肪呢？
Technologies to get leaner pigs:
生产瘦猪的技术
Genetics 遗传
Nutrition 营养
Feed additives 饲料添加剂
Slaughter weight 屠宰体重
Feed low energy diets 饲喂低能量饲料
Gross Energy 总能
Digestible energy 消化能
Fecal Energy
粪能
Metabolizable Energy 代谢能
Urine & Gas Energy
尿能和呼出气能量
Net Energy 净能
Heat Increment
热增耗
Maintenance Energy
维持能量
Productive Energy
生产能量
Productive Energy生产能量
Productive energy used to make lean tissue as long as all other essential nutrients are available在所有其它必需养分都得到了满足的情况下，生产能被用来制造瘦肉组织
Once any of the essential nutrients are gone, lean deposition stops and the excess energy/nutrients are deposited as fat 缺乏任何其它必需养分，瘦肉生长就会停止，多余的能量和养分就会沉积为脂肪
By decreasing energy fed, decrease the amount of energy available to make fat 减少能量的饲喂量，就可减少用于制造脂肪的能量
Also decrease amount of energy available to make lean tissue 也会减少用于制造瘦肉的能量
Times Have CHANGED !!! 时代已经变了!!!
Can’t use 30+ year old technology in today’s swine production and be successful long-term in a world market
在当今的养猪生产中不可能再使用30多年前的陈旧技术而在世界市场上取得长期的成功
Methods to Evaluate Inputs 对投入进行评价的方法
Feed represents 65-75% cost of production – minimize that cost! 饲料代表了生产总本钱的65～75%，要尽可能地降低这一本钱
Traditional – Diet cost/ton
传统方法——每吨产品的饲料本钱
Low quality ingredients 低质量饲料原料
Marginal nutrient levels 养分含量刚刚够
No evaluation of pig performance不测定猪的性能
Feed cost/kg of gain单位增重的饲料本钱
Considers diet cost/ton & feed efficiency考虑每吨产品的饲料本钱和饲料利用率
Doesn’t consider days to market, carcass quality, etc不考虑到达上市体重的天数、胴体质量，等等
Effects of Feeding High-Fiber Diets 饲喂高纤维日粮的后果
Lowers daily gain降低日增重
Less product produced/facility so fixed costs (building, labor, interest, utilities, etc) must be spread over fewer pigs单位设施产出的产品较少，所以固定本钱只能分摊到比较少的猪头上
Higher fixed cost/pig每头猪分摊的固定本钱较高
What does it do to carcass quality:
对胴体质量有什么影响？
Reduces fat thickness 降低脂肪量
Reduces muscle deposition? 减少瘦肉沉积
Effec