Table 4.

Arterial concentrations and uterine extractions of blood gases and energy metabolites during late gestation and farrowing (study-2)

	Stage of gestation1								Farrowing status2
Item	d 28	d 21	d 14	d 10	d 7	d 3	SEM	P-value	Farrowing	Postfarrowing	SEM	P-value
Arterial concentration
O2, mM	6.6	6.5	6.5	6.4	6.3	6.3	0.2	0.60	6.2a	5.9b	0.1	< 0.01
CO2, mM	30.6	31.0	29.7	30.3	30.4	31.2	0.6	0.42	30.2b	31.2a	0.2	< 0.01
Glucose, mM	5.2	5.4	5.1	5.1	5.5	5.0	0.2	0.40	3.9b	4.8a	0.2	< 0.001
Lactate, mM	0.8	0.9	0.9	0.9	0.9	0.8	0.1	0.73	1.5a	1.1b	0.1	< 0.001
Triglycerides, μM	436	443	455	500	529	469	62	0.85	283a	221b	0.01	< 0.001
NEFA, μM	54	81	105	93	106	100	22	0.27	829a	543b	52	< 0.001
Acetate, μM	239b	258b	261b	278ab	318a	329a	22	0.02	176	182	6.3	0.42
Propionate, μM	3.1	3.3	3.5	3.6	3.4	3.6	0.2	0.48	4.3	4.6	0.3	0.45
Butyrate, μM	4.3	4.8	5.1	5.4	5.1	4.7	0.5	0.59	2.4b	3.6a	0.3	< 0.01
Uterine extraction, %
O2	12.6	16.9	16.0	16.2	17.9	17.8	1.9	0.37	10.9	10.7	4.2	0.98
CO2	−4.5	−3.4	−6.3	−3.4	−6.3	−3.9	1.8	0.30	−4.7	−2.6	1.7	0.07
Glucose	3.3c	4.0b	4.5b	5.6ab	5.4ab	6.1a	0.4	<0.001	3.0	2.2	0.7	0.29
Lactate	0.6	0.5	0.6	0.7	0.8	0.5	0.8	0.99	−3.1a	-8.5b	2.3	< 0.01
Triglycerides	−4.6	−1.5	−5.0	−2.2	−1.9	−2.8	4.1	0.97	7.2	1.2	5.9	0.11
NEFA	2.0	3.7	3.8	8.3	11.2	11.1	4.9	0.46	−0.2	−5.3	5.9	0.41
Acetate	−6.4	−3.9	−2.8	0.4	8.5	5.1	4.6	0.08	−14.1	−13.3	8.1	0.25
Propionate	−27.1	−21.2	−17.4	−16.2	−2.8	−9.3	9.3	0.34	−34.3	−40.1	5.3	0.22
Butyrate	8.4	14.1	10.3	9.0	12.2	18.6	3.4	0.17	−14.1b	15.9a	9.0	< 0.05

^a,bMeans within a row with different superscripts differ (P < 0.05).

¹Samples were collected relative to the expected date of farrowing.

²Blood samples collected during farrowing were grouped into 2 categories: farrowing (samples collected while the sows were farrowing) and postfarrowing (samples collected after the sows completed farrowings within 24 h after birth of first piglet).