EFFECT OF GM FEEDS ON LIVESTOCK PERFORMANCE
In the case of substantial equivalence, the “in vivo” trials also remain of major importance;
summarizing the results from feeding trials carried out with poultry, pigs and ruminants,
Flachowsky et al. (2000) have suggested that the transgenic fodder plants examined hitherto
do not significantly differ in their nutritional and physiological assessment from the
isogenic original lines. Namely: “incorporation of the Bacillus thuringiensis (Bt) toxin gene
or the glufosinate (phosphinothricin) tolerance (Pat) gene into the genetic construction of
maize and sugar-beets did not significantly affect chemical composition and digestibility
of crude nutrients and had no consequences on energy content”. Accordingly, in a review
paper authored by Clark and Ipharraguerre (2001), showing the results from 23 research
trials, they indicate that the genetically enhanced corn and soybean currently available in
the marketplace are substantially equivalent in composition to isogenic lines, are similar
in digestibility, and have a similar feeding value for livestock. Similar results have been
obtained by Barri`ere et al. (2001), in feeding experiments on sheep and dairy cows that
compared traditional and Bt176 corn silages. These authors concluded that cattle and sheep
perform equally well with conventional or genetically modified Bt176 corn silage. Also,
Castillo et al. (2004), compared diets containing control cottonseeds or GM cottonseeds
(Bollgard I, Bollgard II and Roundup Ready) in dairy cows, and showed that dry matter
intake, milk yield, milk composition, body weight, and body condition score did not
differ among treatments. In these studies, cottonseed from genetically modified varieties
had the same effect as non-modified cotton on the performance of lactating dairy cows.
Furthermore, no animal tested positive for the integration of the transgene or other plant
genes.
EFFECT OF GM FEEDS ON LIVESTOCK PERFORMANCE
In the case of substantial equivalence, the “in vivo” trials also remain of major importance;
summarizing the results from feeding trials carried out with poultry, pigs and ruminants,
Flachowsky et al. (2000) have suggested that the transgenic fodder plants examined hitherto
do not significantly differ in their nutritional and physiological assessment from the
isogenic original lines. Namely: “incorporation of the Bacillus thuringiensis (Bt) toxin gene
or the glufosinate (phosphinothricin) tolerance (Pat) gene into the genetic construction of
maize and sugar-beets did not significantly affect chemical composition and digestibility
of crude nutrients and had no consequences on energy content”. Accordingly, in a review
paper authored by Clark and Ipharraguerre (2001), showing the results from 23 research
trials, they indicate that the genetically enhanced corn and soybean currently available in
the marketplace are substantially equivalent in composition to isogenic lines, are similar
in digestibility, and have a similar feeding value for livestock. Similar results have been
obtained by Barri`ere et al. (2001), in feeding experiments on sheep and dairy cows that
compared traditional and Bt176 corn silages. These authors concluded that cattle and sheep
perform equally well with conventional or genetically modified Bt176 corn silage. Also,
Castillo et al. (2004), compared diets containing control cottonseeds or GM cottonseeds
(Bollgard I, Bollgard II and Roundup Ready) in dairy cows, and showed that dry matter
intake, milk yield, milk composition, body weight, and body condition score did not
differ among treatments. In these studies, cottonseed from genetically modified varieties
had the same effect as non-modified cotton on the performance of lactating dairy cows.
Furthermore, no animal tested positive for the integration of the transgene or other plant
genes.
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