Table A.1.

Overview of missing data and (potential) outliers.

Farm ID	Flock	Type of data	Parameter	Explanation
1	1, 2, 4–7	Historical	FCR	All values were checked by the veterinarian; the values of the first 2 flocks were correct, the values of the last 4 flocks were incorrect and therefore removed
3	10	Observational	ADG, FCR, and MR	Missing data; data could not be obtained
6	8–12	Observational	ADG	All values were checked by the veterinarian; and replaced by the correct data
7	2, 4	Historical	FCR	Not enough evidence to assume that the observations were incorrect
7	10, 11	Observational	ADG	All values were checked by the veterinarian; and replaced by the correct data
8	1	Historical	ADG	The value was checked by the veterinarian and corrected afterwards
9	13–16	Observational	FCR	All values were checked by the veterinarian, and replaced by the correct data
11	3–5	Historical	MR	Not enough evidence to assume that the observations were incorrect
12	6	Historical	FCR	The value was checked by the veterinarian, and appeared to be correct
12	5	Observational	FCR	The value was checked by the veterinarian, and appeared to be correct
13	1, 3, 5, and 6	Historical	FCR	All values were checked by the veterinarian; the value of the first flock was corrected, the values of the other flocks were incorrect and therefore removed
13	3	Historical	MR	Not enough evidence to assume that the observation was incorrect
13	7	Historical	MR	Missing observation; data could not be obtained
14	1	Historical	ADG	The value was checked by the veterinarian and corrected afterwards
16	5	Historical	MR	Not enough evidence to assume that the observation was incorrect
16	5	Historical	MR	The veterinarian checked the value; in this flock, there were problems in the climate control within the stable. Consequently, all technical performance indicators of this flock were considered as outlier and removed.
19	3	Observational	ADG	The value was checked by the veterinarian, and appeared to be correct