Adjusting Performance Data for Non Genetic Factors


The following adjustment factors come from work done originally at Texas A&M - San Angelo combined with work on adjustment factors for sheep. Specifically they were obtained from the Boer Goat Improvement Network, B-GIN Fact Sheet, 2004 EPD Report.

Multiplicative factors used to adjust birth
and weaning weights for non-genetic effects:

EFFECT LEVEL BIRTH WEIGHT
ADJUSTMENT FACTOR		 WEANING WEIGHT
ADJUSTMENT FACTOR
Kid Sex Buck 0.91 0.90
  Doe 1.00 1.00
  Wether - 0.97
Type of
Birth - Rearing		 1-1 1.00 1.00
  1-2 - 1.14
  2-1 - 1.04
  2-2 1.13 1.18
  3-1 - 1.08
  3-2 - 1.23
  3-3 1.27 1.27
Age of Dam 1 1.27 1.10
  2 1.07 1.09
  3-7 1.00 1.00
  8+ 1.05 1.00

NOTES:

Actual birth weights and age-adjusted (to 90 days) weaning weights are multiplied by the factor shown to correct for non-genetic effects of kid sex, type of birth (for birth weight) or birth and rearing (for weaning weight), and age of the dam.

Type of birth - type of rearing. Birth weights were adjusted only for type of birth.

Multiplicative factors used to adjust
litter size for effects of age of dam:

AGE OF DAM ADJUSTMENT FACTOR
1 1.48
2 1.17
3 1.05
4 1.01
5 1.00
6 1.00
7 1.02
8 1.05
9+ 1.13