Feedipedia
Animal feed resources information system
Feedipedia
Feedipedia

Glossary

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Name Definition
NDF

NDF, fraction of the cell walls according to Van Soest, considered to be roughly equivalent to hemicellulose, true cellulose and lignin.

NE growing pig

Net energy for growing pig. Difference between the metabolizable energy and the energy lost in heat during metabolization process.

Nitrogen degradability (effective, k=4%)

Effective degradability of nitrogen in ruminants, calculated with a hourly disappearance rate of 4%. The effective degradability is calculated as D = a + ((b*c)/(k+c)) where a = fraction immediately degradable, b = fraction potentially degradable, c = degradation rate of particles and k = hourly disappearance rate of particles (Ørskov and MacDonald, 1979).

Nitrogen degradability (effective, k=6%)

Effective degradability of nitrogen in ruminants, calculated with a hourly disappearance rate of 6%. The effective degradability is calculated as D = a + ((b*c)/(k+c)) where a = fraction immediately degradable, b = fraction potentially degradable, c = degradation rate of particles and k = hourly disappearance rate of particles (Ørskov and MacDonald, 1979).

Nitrogen digestibility, growing pig

Nitrogen digestibility for the growing pig, calculated as percentage of digestible (total tract) nitrogen relative to the nitrogen content of the feed.

Nitrogen digestibility, rabbit

Nitrogen digestibility for the rabbit, calculated as percentage of digestible (total tract) nitrogen relative to the nitrogen content of the feed.

Nitrogen digestibility, ruminants

Nitrogen digestibility for ruminants, calculated as percentage of digestible (total tract) nitrogen relative to the nitrogen content of the feed.

Nitrogen digestibility, salmonids

Nitrogen digestibility for salmonids (salmons and trouts), calculated as percentage of digestible (total tract) nitrogen relative to the nitrogen content of the feed.