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Table 4 Summary of variables used in statistical analyses for identifying covariates for layer poultry performance in opened and sealed housing systems in the Savannah region of Nigeria

From: Predictors of death and production performance of layer chickens in opened and sealed pens in a tropical savannah environment

Variable

Description

Month

The month during which total daily egg production was recorded (January - December)

Season

The season during which total daily egg production was recorded (cold-dry, hot-dry or warm-wet). This variable was generated from the Month variable.

Pen_number

Unique identifier for pen (1 - 8)

Pen_type

Unique identifier for the type of pen (opened or sealed)

Age

Age of layers during which total daily egg production was recorded (19 - 101 weeks)

Total_layers

Total number of layers or stocking density on daily record

Total_dead

Total number of dead layers on daily record

Mortality

Percentage dead of layers on daily record

Feed_layer

Quantity of feed (gram) required per layer per day

Feed_egg

Quantity of feed (gram) required per egg production per day

Feed_required

Total feed required (kilogram) per layer per day

Actual_feed

The actual feed (kilogram) fed to layers per day

Total_eggs

Total number of eggs produced per day

Total_crates

Total number of crates of eggs produced per day

Egg_production

Percentage daily egg production