ABSTRACT: Five experiments were conducted to
evaluate the effects of dietary spray-dried porcine
plasma (SDPP) and spray-dried bovine plasma (SDBP)
and their various molecular weight fractions on performance
of pigs weaned at approximately 14 or 21 d of
age. In addition, the efficacy of various levels of the
immunoglobulin G (IgG)-rich fraction of SDPP and
SDBP were evaluated. Experiment 1 evaluated the dietary
addition of SDPP and three of its fractions (IgGrich,
albumin-rich, and low molecular weight fractions).
Pigs fed SDPP grew faster and consumed more feed
than the controls during the first week (P < 0.05). The
IgG-rich fraction resulted in improvements in ADG and
ADFI that were similar to those of pigs fed SDPP. The
albumin-rich fraction had no effect on growth rate, but
the low molecular weight fraction decreased feed intake
as well as growth rate. Experiments 2 and 3 evaluated
SDPP and graded levels of its IgG-rich fraction in pigs
weaned at 21 or 14 d, respectively. In Exp. 2, pigs fed
SDPP grew faster and consumed more feed than the
controls during the first week (P < 0.05). Pig performance
was enhanced with the addition of the IgG-rich