Use of Exogenous Fibrolytic Enzymes to Improve Feed Utilization by Ruminants

  title={Use of Exogenous Fibrolytic Enzymes to Improve Feed Utilization by Ruminants},
  author={Karen A Beauchemin and Dar{\'i}o Colombatto and Diego P. Morgavi and W. Z. Yang},
  journal={Journal of Animal Science},
Research has demonstrated that supplementing dairy cow and feedlot cattle diets with fiberdegrading enzymes has significant potential to improve feed utilization and animal performance. Ruminant feed enzyme additives, primarily xylanases and cellulases, are concentrated extracts resulting from bacterial or fungal fermentations that have specific enzymatic activities. Improvements in animal performance due to the use of enzyme additives can be attributed mainly to improvements in ruminal fiber… 
Improving Forage Quality and Animal Performance with Fibrolytic Enzymes
The intention in this paper is to review the literature on the effects of enzyme application to feeds at ensiling or feeding, and to present the results of certain preliminary studies aimed at improving the utilization of tropical forages with fibrolytic enzymes.
Effect of Exogenous Enzymes on Ruminal degradation of Feed and Animal Performance: A review
The better understanding of the production techniques, enzyme activity, mode of enzyme action and application techniques of commercial non starch polysaccharidase enzymes can help the scientific community for competent utilization of these biotechnological products for efficient utilization of the available feed resources.
Mode of action of exogenous cell wall degrading enzymes for ruminants
Adding exogenous enzymes to the diet increases the hydrolytic capacity of the rumen mainly due to increased bacterial attachment, stimulation of rumen microbial populations and synergistic effects with hydrolases of ruminal microorganisms.
Ruminant Nutrition Symposium: Improving cell wall digestion and animal performance with fibrolytic enzymes.
This paper aimed to summarize published responses to treatment of cattle diets with exogenous fibrolytic enzymes (EFE), to discuss reasons for variable EFE efficacy in animal trials, to recommend
Fibrolytic enzymes improving in vitro rumen degradability of tropical forages.
The results indicated that the use of fibrolytic enzymes can be a reliable strategy to improve degradability of low-quality forages, contributing to the sustainability and intensification of livestock production in tropical countries.
Effect of adding fibrolytic enzymes to dairy cow rations on digestive activity in the rumen.
the objective of the study was to determine whether supplementing the rations of red-and-white Polish holstein-friesian dairy cows with exogenous fibrolytic enzymes in the form of fibrozymetm
J J The' objective of this paper is to examine the role of exogenous fibrolytic enzymes on ruminant productivity. These fibrolytic enzymes have been reported to be effective to increase feed
Supplementation of exogenous fibrolytic enzyme in livestock nutrition
Exogenous fibrolytic enzymes can be used to increase utilization of feed and increase production of the animals, which help in degradation of specific bond, anti nutritional factors present in the feed, changes in the micro flora profile in the small and large intestine.


Evaluation of a nonstarch polysaccharidase feed enzyme in dairy cow diets.
Increased intake of digestible energy due to enzyme supplementation did not increase milk yield or milk component yield, and further research is necessary to determine the mechanism by which adding a fibrolytic enzyme mixture enhanced intake, but only increased feed digestion when used at a low level.
Influence of supplementary fibrolytic enzymes on the fermentation of corn and grass silages by mixed ruminal microorganisms in vitro.
It was concluded that enzyme activity, probably a type of endo-(beta-1,4)-glucanase activity, limits the rate of fermentation of corn and grass silage in the rumen and treatment of the ration prefeeding will be key to harnessing the potential of exogenous fibrolytic enzymes in ruminant nutrition.
Synergy between ruminal fibrolytic enzymes and enzymes from Trichoderma longibrachiatum.
The synergistic effect between ruminal and exogenous enzymes increases the hydrolytic potential within the rumen environment and is likely a significant mechanism by which enzyme additives improve feed digestion in ruminants.
Fibrolytic enzyme treatment of barley grain and source of forage in high-grain diets fed to growing cattle.
It is demonstrated that using a fibrolytic enzyme mixture in high-grain diets that contain mainly barley grain can improve fiber digestion and grain utilization, but the mode of action is unclear.
Effect of direct-fed fibrolytic enzymes on the digestive characteristics of a forage-based diet fed to beef steers.
Results from this study indicate that direct application of enzymes to forages is capable of improving forage digestion.
A comparison of methods of adding fibrolytic enzymes to lactating cow diets.
The results indicate that fibrolytic enzymes have the potential to increase digestibility and milk production in dairy cows because digestion is low relative to potential Digestibility and when digestion is higher, as was observed in lambs or in vitro, no improvement in digestibility occurs.
Intraruminal supplementation with increasing levels of exogenous polysaccharide-degrading enzymes: effects on nutrient digestion in cattle fed a barley grain diet.
The effects of supplying increasing ruminal doses of exogenous polysaccharide-degrading enzymes (EPDE) on rumen fermentation and nutrient digestion were studied using eight ruminally cannulated heifers and did not affect urinary excretion of allantoin and uric acid, or concentrations of glucose and urea in blood.
Effects of fibrolytic enzymes in corn or barley diets on performance and carcass characteristics of feedlot cattle
Meat from barley- fed calves tended to be more highly marbled and was brighter in colour than meat from corn-fed calves, but diet had no effect on muscle score, rib eye area, or carcass leanness.
Stability and stabilization of potential feed additive enzymes in rumen fluid*