Table 4.

Increased lysine and energy feeding duration prior to parturition on litter performance to weaning within parity category¹

	Gilts				Sows
Response	Control	Day 113	Day107	SEM	Control	Day 113	Day 107	SEM
Litters, n	42	43	41	—	99	98	100	—
Litter weight, kg
After cross foster2	19.8	20.2	20.5	0.39	20.9	21.4	21.6	0.33
Weaning5	73.2	71.6	70.4	1.55	76.2	78.3	77.4	1.20
Average piglet BW, kg
After cross foster2	1.48	1.52	1.54	0.029	1.56	1.60	1.61	0.025
Weaning5	5.98	6.00	5.80	0.105	6.57	6.54	6.56	0.082
Litter gain3,4,5, kg	54.0a	51.5ab	49.7b	1.61	55.2	57.0	55.7	1.05
Litter count, n
After cross foster2	13.3	13.5	13.3	0.56	13.6	13.2	13.7	0.36
Weaning	12.3	12.1	12.2	0.54	11.7	11.9	11.9	0.34
Fallbacks6, %	2.9	2.9	2.4	0.66	5.3	3.7	4.9	0.63
Mortality4,7, %	5.0	7.5	5.1	1.14	8.1a	5.4b	7.1ab	0.79
Weaned4,8, %	92.4	90.2	92.0	1.33	86.6b	90.9a	88.3b	1.06
Wean age, d	20.8	20.9	20.7	0.23	20.8	20.6	20.6	0.15

¹A total of 423 sows were weaned from an initial 472 sows that farrowed. Sows were removed due to poor milking, health challenge, becoming nurse sows. Pigs stayed with birth sow until 24 h, then were cross-fostered within regimen to equalize litter size. Regimens consisted of: 1) Control: 2.0 kg/d gestation feed (12.5 g SID Lys and 6.5 Mcal ME) until day 113 of gestation, then 2.7 kg/d lactation feed (28 g SID Lys and 9.4 Mcal ME) until parturition; 2) 2.0 kg/d gestation feed (12.5 g SID Lys and 6.5 Mcal ME) until day 113 of gestation, then 3.8 kg/d lactation feed (40 g SID Lys and 13.3 Mcal ME) until parturition; or 3) 3.8 kg/d lactation feed (40 g SID Lys and 13.3 Mcal ME) from day 107 of gestation until parturition. Movement from gestation to farrowing occurred at day 113 (± 2 d) of gestation. Weaning occurred at day 18 to 24 of lactation.

²Piglets were cross-fostered within regimen between 24 and 48 h. Weights are adjusted to reflect the addition or subtraction of fostered piglets.

³Litter gain = Litter weaning weight – litter weight after cross foster.

⁴Significant regimen within parity differences. Values within the parity category without a common superscript differ (P < 0.05).

⁵Count after cross-fostering used as a covariate.

⁶Fallbacks were pigs removed due to weight loss or injury and moved to a nurse sow. This occurred between days 3 and 10 of age and is divided by the litter count after cross-fostering.

⁷Mortality that occurred after cross-fostering until weaning does not include mortality in the first 24 h.

⁸Percentage weaned = litter count at weaning/litter count after cross foster.