Effect of piglet separation from dam at birth on colostrum uptake.

The objective of this study was to determine whether birth order influences piglet survival because of reduced uptake of maternal antibodies by the piglets born later in large litters. Forty-five litters were serially allocated to one of 2 study groups. The crèche group consisted of 18 litters for which the 205 piglets were removed to a warm box to prevent suckling until 4 h after delivery of the first pig, and the control group of 27 litters for which 306 piglets were allowed to suckle from birth. The protein content of piglet blood and sow colostrum was determined with Brix refractometers. Parity, farrowing duration, liveborn litter size, litter size at 12 d, and piglet weight at birth and at 24 h and 12 d of age did not differ between the 2 treatment groups (P > 0.1). There were also no significant differences (P > 0.1) at any time point in weight or in the mean percent protein in plasma between the first 3 and the last 3 piglets born to an individual sow. However, the mean percent protein in plasma was significantly higher in the control group than in the crèche group at both 24 h (P ≤ 0.05) and day 12 (P ≤ 0.01) postpartum. The lack of differences in plasma protein levels between the first and last pigs born along with the lower percent plasma protein in the piglets that were prevented from suckling immediately after birth militate against the use of this technique as a way to equalize the opportunity for adequate transfer of maternal antibodies.