Table 1. Sample description.

The dataset contains 21,247 females and 3,337 males. 12,195 of Landrace and 12,389 of Large White breeds. Predictors: Average Daily Gain, Backfat Thickness, Muscle, Thickness, Birth Date, Breed, Sex. Dependent variables: scores for front and back legs.

Variable	Min	1stQu.	Median	Mean	3rdQu.	Max
Average Daily Gain	0.33	0.72	0.79	0.79	0.85	1.61
Backfat Thickness	4.30	10.90	12.90	13.25	15.20	35.60
Muscle Thickness	32.12	56.04	59.70	59.68	63.40	96.00
Birth Date	2012	2014	2015	2015	2016	2016
Scores
Front Legs	1.00	3.00	3.00	3.11	3.00	5.00
Back Legs	1.00	3.00	3.00	2.99	3.00	5.00