The number of pigs per litter at farrowing, on d 1
(i.e., after cross-fostering), and at weaning was not
different (P > 0.10) among temperatures and dietary
CP levels (Table 1). The average birth weight was
1,602 g and did not differ (P > 0.10) between treatment
groups. Dietary treatments did not affect (P > 0.10)
piglet growth rate during lactation. Compared to 20°C,
exposure to 29°C depressed (P < 0.001) piglet BW gain
(182 vs 254 g/d) and daily milk yield (7.35 vs 10.43
kg/d) over the first 3 wk of lactation.