Forage quality, allocation, and supplementation throughout lactation
Forage quality characteristics can affect diet cost,energy intake and partitioning,feed conversion efficiency (FCE),and animal health.These characteristics include neutral detergent fiber concentration and digestion characteristics,starch concentration and digestibility,particle size and fragility,and crude protein concentration and composition.Forages are unique among diet ingredients fed to ruminants because they provide fiber that is effective at retaining feed particles in the rumen,increasing their digestibility and increasing digesta mass and volume.Increased digesta mass in the rumen can reduce risk of ruminal acidosis and abomasal displacement but can also limit feed intake,depending upon the physiological state of animals.Optimal forage allocation and supplementation strategies for dairy cattle must consider variation in forage quality characteristics as well as cows responses to their diet throughout lactation.Control of feed intake by ruminal distension increases with milk yield and diet forage NDF concentration.This paper will discuss the relative importance of forage quality characteristics to cows and how they change throughout the lactation cycle.
forage quality dairy cows energy intake energy partitioning feed efficiency
Mike Allen
Department of Animal Science, Michigan State University, East Lansing 48824
国际会议
3rd International Symposium on Dairy Cow Nutrition and Milk Quality(第三届“奶牛营养与牛奶质量国际研讨会)
北京
英文
131-138
2013-05-11（万方平台首次上网日期，不代表论文的发表时间）