ner: Nutrient Efficiency Ratio (NER)

In aquacultuR: A Comprehensive R Tool for Zootechnical Metrics

Nutrient Efficiency Ratio (NER)

Description

Function to calculate the Nutrient Efficiency Ratio (NER). The NER belongs to the Nutrient Use Efficiency metrics and relates the intake of a compound with the bodyweight increase. If the feed intake (FI) is restricted and the administered diets are of comparable digestibility, then potential differences in growth could be related to differences in the sub-composition of target nutrients that are also controlled for. This would be reflected by the NER.

Usage

ner(ibw, fbw, fi, nut_f, dm = 1)

Arguments

ibw	a numeric value for the initial weight (either average weight of the individuals or the total biomass) of the livestock at the beginning of the feeding trial.
fbw	a numeric value for the final weight (either average weight of the individuals or the total biomass) of the livestock at the end of the feeding trial.
fi	numeric; value providing the total feed intake in grams during the experiment.
nut_f	numeric; value within the interval of (0,1), indicating the inclusion rate of the nutrient of interest in the feed fed.
dm	numeric; value within the interval of (0,1), indicating the dry matter content of the feed. Default is 1 (100%).

Value

returns a single numeric value

Author(s)

Anıl Axel Tellbüscher

Examples

# Initial bodyweight = 10 g
# Final bodyweight = 100 g
# Feed intake = 240 g
# Nutrient mass fraction in feed = 0.5 g/g
ner(ibw = 10, fbw = 100, fi = 240, nut_f = 0.5)

aquacultuR documentation built on Jan. 26, 2026, 5:07 p.m.