Table 1.

Effect of the prenatal and postnatal (growing) climatic environment on the growth performance of growing pigs¹

Items	GTN–PTN	GTN–PHS	GHS–PTN	GHS–PHS	RSD2	Statistics3
Live BW, kg
75 d	35.8	36.1	36.6	35.2	1.7	GE**, P**, S* PE × GET, GE × P**
82 d	42.3	42.6	43.7	41.6	1.69
140 d	104.4a	105.8a	98.8b	95.6b
ADG, g · d−1
75 to 81 d	859	888	997	943	70	P**, GE × P**
82 to 140 d	1,147	1,114	1,017	989
82 to 140 d4	1,110a	1,129a	983b	967b	52	GE**
ADFI, g · d−1
75 to 81 d	1,729	1,884	1,996	1,901	168	P**, GE × P**
82 to 140 d	2,635	2,683	2,347	2,307
82 to 140 d4	2,602a	2,680a	2,215b	2,255b	84	GE**, S*
ADFI per metabolic BW, g · kg–0.60·d–1
75 to 81 d	198	208	218	210	11	P**, GE × P*
82 to 140 d	196	202	180	181
82 to 140 d4	198a	202a	172b	178b	6	PET, GE**, S*
FCR
75 to 81 d	2.02	2.12	2.01	2.02	0.09	P**
82 to 140 d	2.30	2.41	2.31	2.33
82 to 140 d4	2.34	2.37	2.29	2.31	0.08	ns

¹A total of 48 female pigs (housed three pigs per pen) were distributed to a 2 x 2 factorial design based on their prenatal environment (PE) and their postnatal growing environment (GE): TN – thermoneutral (18 to 24˚C), HS = heat-stressed (28 to 34˚C). First main period: Pigs were maintained in TN conditions from 75 to 81 d of age. Second main period: The GTN room was maintained in TN conditions until 140 d of age; in GHS room, temperature transition started at 82 d of age and full-blown thermal challenge was from 84 to 140 d of age.

²Residual standard deviation.

³The pen was considered as the experimental unit. Data were analyzed using PROC MIXED model with PE, GE, period (P), their interactions, and sire (S) as fixed effects. LS means with different superscript letters differ according to the experimental group ^TP < 0.10, *P < 0.05, **P < 0.01.

⁴Adjusted performance based on the average value measured during first main period (944 g/d, 1,915g/d, 212 g·kg BW^−0.60·d⁻¹, and 2.03 for ADG, ADFI, ADFI per metabolic BW, and FCR, respectively).