Soybean meal from roundup ready or conventional soybeans in diets for growing-finishing swine

Abstract

Dehulled soybean meal prepared from genetically modified, herbicide (glyphosate)-tolerant Roundup Ready soybeans containing the CP4 EPSPS protein and near-isogenic conventional soybeans were assessed in an experiment with growing-finishing pigs. The soybeans were grown in the yr 2000 under similar agronomic conditions except that the Roundup Ready soybeans were sprayed with Roundup herbicide. Both were processed at the same plant. The composition of the two types of soybeans and the processed soybean meal were similar. Corn-soybean meal diets containing conventional or Roundup Ready soybean meal and fortified with minerals and vitamins were fed to 100 cross-bred pigs from 24 to 111 kg BW. Diets contained approximately 0.95% lysine initially and were reduced to 0.80 and 0.65% lysine when pigs reached 55 and 87 kg BW, respectively. There were 10 pens (five pens of barrows and five pens of gilts) per treatment with five pigs per pen. All pigs were scanned at 107 kg mean BW and all barrows were killed at the end of the test for carcass measurements and tissue collection. Rate and efficiency of weight gain, scanned backfat and longissimus area, and calculated carcass lean percentage were not different (P > 0.05) for pigs fed diets containing conventional or Roundup Ready soybean meal. Gilts gained slower, but they were more efficient and leaner (P < 0.05) than barrows. Responses to the type of soybean meal were similar for the two sexes with no evidence of a diet x sex interaction for any of the traits. In most instances, carcass traits of barrows were similar for the two types of soybean meal. Longissimus muscle samples from barrows fed conventional soybean meal tended (P = 0.06) to have less fat than those fed Roundup Ready soybean meal, but water, protein, and ash were similar. Sensory scores of cooked longissimus muscles were not influenced (P > 0.05) by diet. The results indicate that Roundup Ready soybean meal is essentially equivalent in composition and nutritional value to conventional soybean meal for growing-finishing pigs.

Performance of growing–finishing pigs fed diets containing Roundup Ready wheat (MON 71800), a non-transgenic genetically similar wheat, or conventional wheat varieties

“…The lack of an effect of transgenic wheat on carcass measures is similar to the findings of a number of studies that have evaluated Roundup Ready corn and soybean meal in pigs (Stanisiewski et al, 2001;Cromwell et al, 2002;Hyun et al, 2004) and broiler chickens (Hammond et al, 1996;Taylor et al, 2003a and2003b), and was to be expected given that there was no effect of the transgenic variety on growth performance in any of these studies.…”

“…Also, Gaines et al (2001) showed no difference in the digestible energy coefficients of Roundup Ready corn compared to a genetically similar corn hybrid that lacked the transgenic trait. Studies with Roundup Ready soybean meal containing the same genetic modification as the wheat used in the present study also showed no effect on the growth performance of pigs relative to the non-transgenic genetically similar control soybean meal (Cromwell et al, 2002). A number of other studies with a range of species that have compared the growth performance of animals fed Roundup Ready corn or soybean meal with that of animals fed the non-transgenic genetically similar or conventional commercial varieties have shown no negative impact on growth.…”

“…Studies have been carried out involving the feeding of genetically modified corn (Stanisiewski et al, 2001;Hyun et al, 2004) and soybeans (Cromwell et al, 2002) to pigs; however, little research has been conducted with genetically modified wheat. Because finishing pigs consume large quantities of grain, this experiment was conducted to determine whether pigs fed Roundup Ready (MON 71800) and conventional (non-transgenic) wheat have similar performance.…”

GMOs: building the future on the basis of past experience

“…Studies assessing the acute nutritional value (around four weeks) or chronic nutritional value (up to 15 weeks) have already be carried out using rats, mice, pigs, chicken, fi sh, nothura and cattle (Hammond et al 1996, Rogers 1998, Cromwell et al 2001, Teshima et al 2000. These studies demonstrate that feeding with Roundup Ready® soybeans was substantially equivalent to feeding with traditional soybeans for inducing growth in the animals and the production of milk and fermentation of the cows' rumen.…”

Análise comparativa de mapas protéicos de amostras de soja convencionais e tolerantes ao herbicida glifosato visando à inocuidade alimentar

“…Estudos têm também demonstrado claramente que a modificação genética da soja a qual confere tolerância ao herbicida glifosato não afeta a composição nutricional ou o desempenho de animais alimentados com refeições a base de soja, além de não apresentar efeito tóxico (BRAKE; EVENSON, 2004;CROMWELl et al, 2002;JENNINGS et al, 2003). Outros resultados também corroboram a inocuidade de uma variedade de soja nacional GM submetida a ensaios nutricionais com ratos machos durante 14 e 28 dias (CINTRA, 2004;GIORA, 2005).…”