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

Table 3 Comparisons of lifetime performance between three female return-to-service groups

	Female return groups
	Non-return		Return once or twice, but not SRB		SRB
Lifetime performance measurements	N	Mean (± SE)	N	Mean (± SE)	N	Mean (± SE)
Annualized lifetime number of pigs born alive	56,803	27.6 (0.15)^a	29,093	25.7 (0.15)^b	853	21.4 (0.26)^c
Annualized lifetime number of pigs weaned	56,803	23.6 (0.10)^a	29,093	22.3 (0.10)^b	853	19.3 (0.20)^c
Lifetime non-productive days	61,348	74.0 (1.26)^c	31,106	122.5 (1.26)^b	1150	165.3 (1.74)^a
Lifetime pigs born alive	56,803	58.9 (0.80)^b	29,093	60.9 (0.80)^a	853	44.5 (1.35)^c
Gilt age at first-mating, days old	57,022	254.6 (3.18)^ab	28,771	253.7 (3.18)^b	1044	254.7 (3.33)^a
Number of parity at removal	61,348	4.7 (0.07)^b	31,106	4.9 (0.07)^a	1150	2.9 (0.10)^c
Number of parity at culling	51,496	4.9 (0.08)^b	27,389	5.0 (0.08)^a	1052	2.8 (0.11)^c
Number of parity at death	9852	3.2 (0.07)^c	3717	4.1 (0.07)^a	98	3.5 (0.24)^b
Female life days	58,482	950.2 (10.28)^b	29,407	1029.5 (10.28)^a	1083	807.7 (14.99)^c
Total cumulative re-service intervals, days	61,348	0.0 (0.00)	31,106	56.0 (1.05)^b	1150	111.3 (1.52)^a

ISSN: 2055-5660