Forage Crises? Extending Forages and Use of Non-forage Fiber Sources
نویسندگان
چکیده
Forage availability is sometimes limited because of poor growing conditions or because of insufficient land base on individual farms. In addition, forage fiber can limit feed intake, particularly for high producing cows, and forage quality is highly variable. Therefore, there is continual interest in alternatives to forages in diets for dairy cows. Decreasing the forage content of diets requires careful selection of ingredients for use in the dietary space created. Because cereal grains must be limited in diets to avoid ruminal acidosis, byproduct feeds with high fiber content are the most commonly discussed alternatives to forages. These can replace some, but not all, forage in diets of lactating cows. These byproduct feeds are referred to as non-forage fiber sources (NFFS) to distinguish them from other byproduct feeds. However, cereal grains also can be used in place of forages to some extent if fermentability of starch is reduced. Forage alternatives should be considered based on their ability to substitute functionally for forage. This paper discusses how forages function in diets of dairy cows, and factors to consider when selecting forage alternatives.
منابع مشابه
Crude protein fractionation and fiber analysis of commerical non-forage fiber sources for ruminants in central iran
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