Characteristics and risk factors for severe repeat-breeder female pigs and their lifetime performance in commercial breeding herds

Table 2 Severe repeat-breeder (SRB) risks in served female pigs by parity group

	Parity
Measurements	0	1	2	3	4	5	6 or later
Number of serviced records	93,604	78,243	70,596	62,258	53,371	43,634	52,352
Number of first return records	11,458	8734	5625	4730	3772	2694	2614
First return occurrences, %	12.2	11.2	8.0	7.6	7.1	6.2	5.0
Number of second return records	2325	1324	834	695	490	297	290
Number of culled records after the second return^a	246	142	87	105	68	55	49
Number of removed records after the second return^b	394	232	168	136	90	68	64
Number of SRB females^c	532	235	145	104	70	34	38
SRB risk for first-served females, %	0.57	0.30	0.21	0.17	0.13	0.08	0.07

^aNumber of females culled due to reproductive failure
^bOther removed records included females removed due to non-reproductive problems (e.g., lameness, diseases or death)
^cThe 8 pigs (1158-1150) had twice SRB in their lifetime

ISSN: 2055-5660