This video from the My Forage System channel explains the various concepts related to the digestibility of NDF fiber (Neutral Detergent Fiber) and its importance for the diet of ruminants.
Key points:
NDF definitions:
NDF is a measure of the quantity of fiber in a forage.
It is analyzed in the laboratory and expressed as a percentage of the dry matter of the fodder.
There are several ways to measure NDF, each giving slightly different information.
Factors influencing NDF:
The type of plant, its maturity stage and the growing conditions influence the NDF content of the fodder.
Post-harvest treatments, such as drying or silage, can also change NDF.
Digestibility of NDF:
The digestibility of NDF is the proportion of NDF that is degraded by microorganisms in the rumen of the ruminant.
It is important because it determines how much energy the animal can get from the fodder.
Several factors influence the digestibility of NDF, such as the particle size of the fodder, the chemical composition of the fiber, and the presence of microorganisms in the rumen.
Concepts related to NDF:
Effective NDF: a measure of the ability of fodder to stimulate milk production and animal health.
TD NDF: total digestibility of NDF in the intestinal tract.
NDF passage and management rates: indicate the rate at which NDF degrades and passes into the rumen.
Use of NDF in animal feed:
Measuring NDF and its derived parameters can help farmers choose appropriate forages for their animals.
It makes it possible to optimize the food ration and to improve the production and health of ruminants.
Recommendations:
It is important to use reference values for NDF and its derived parameters for each type of ruminant and production.
It is advisable to have forages analyzed by a laboratory to find out their NDF content and other nutritional characteristics.
It is important to consult an animal nutritionist to formulate balanced rations adapted to the needs of animals.