In all
mixtures, barley, wheat and corn grain, soybean meal,
wheat bran, vitamin-mineral additives, and crystalline
amino acids were used, and the diets were
isonitrogenous and isoenergetic. Grower feed mixtures
(first fattening period 30-60 kg b.w.) contained 12.6 MJ
ME, 175 g of crude protein, 9.7 g of Lys, and 6.1 g of
Met+Cys while the finisher feed mixtures (second
fattening period 60-110 kg b.w.) contained 12.6 MJ EM,
160 g of crude protein, 8.1 g of Lys, and 5.3 g of
Met+Cys. The diets used in the experiment differed in
the presence of the genetically modified or non-modified
soybean meal (18% in grower and 14% in finisher
mixture) and corn grain (13% in grower and 10% in
finisher mixture). The grain of corn (MON810)
modified with Bt gene for protection against the maize
borer and soybean meal produced from glyphosatetolerant
plants Roundup Ready (MON-40-30-2) were
used in the experiment. Fatteners were divided into six
groups. Scheme of the experiment was as follows: group
I - control, non-modified soybean meal and corn, group
II - GM soybean meal and non-modified corn, group III
- non-modified soybean meal and GM corn, group IV -
GM soybean meal and GM corn, group V - nonmodified
soybean meal and bruised grain, and group VI
- GM soybean meal and non-modified bruised grain.
The experiment lasted from about 30 kg to 110 kg of
pigs’ body weight.