The short answer is “nothing”.

EFSA (the European Food safety Authority) has just recently published a report on whether any traces of GM feed are detectable in products from such animals. They are not.

The report concludes:

1. Biologically active genes and proteins are common constituents of foods and feed in varying amounts. After ingestion, a rapid degradation into short DNA or peptide fragments is observed in the gastrointestinal tract of animals and humans.

2.To date, a large number of experimental studies with livestock have shown that recombinant DNA fragments or proteins derived from GM plants have not been detected in tissues, fluids or edible products of farm animals like broilers, cattle, pigs or quails.

Source:

EFSA statement on the fate of recombinant DNA or proteins in the meat, milk or eggs of animals fed with GM feed. European Food Safety Authority (20.7.07) (http://www.efsa.europa.eu/en/science/gmo/statements0/efsa_statement_dna_protein_gastroint.html)

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