Effect of plasma, lactose and soy protein source in phase I diets on nursery pig performance.
Research at the University of Missouri with 128 18-day-old
weaned pigs compared the effects of plasma proteins, lactose and soy
protein sources in phase I starter diets on pig performance. The experiment
consisted of a 2x2x2 factorial arrangement of treatments with two levels
of plasma proteins (0 and 7 percent), two levels of lactose (0 and 30
percent) and two soy protein sources (soybean meal and extruded soy
protein concentrate). The diets were formulated to contain 1.56 percent
lysine and 0.86 percent sulfur amino acids. All diets contained 1.75
percent spray-dried blood meal. Phase I diets were fed for 14 days.
The addition of plasma proteins increased average daily gain (ADG) and
average daily feed intake (ADFI) in Phase I, but plasma had no effect
on pig weight at day 39 of the experiment. Lactose increased ADG and
ADFI in phase I with no effect on subsequent performance. There were
soy protein by plasma proteins interactions in ADG and ADFI in phase
I. Plasma proteins increased ADG and ADFI in the pigs fed soybean meal.
When plasma proteins were not in the diet, there were no differences
between the soybean protein sources. Between days 14 and 39, there was
no difference in ADG, ADFI or feed efficiency between the pigs fed soybean
meal and extruded soy protein concentrate. The researchers concluded
that the results demonstrated that both plasma proteins and lactose
improve phase I pig performance, and soybean meal can be used as a major
protein source in phase I diets with no detrimental effect on performance,
if there is plasma in the diet.
Liu, H., K.J. Touchette, G.L. Allee and M.D. Newcomb. 1997. Effect
of plasma, lactose and soy protein source in phase I diets on nursery
pig performance. J. Animal Sci. 75(Suppl. 1):Abstract 247.
