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Analytical composition and rumen degradability of isogenic and transgenic corn varieties

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Two different corn cultivars were compared with their genetically modified counterparts containing the gene coding for the Cry1A(b) protein of Bacillus thuringiensis (Bt). There were no analytical differences between the conventional and transgenic genotype kernels, whereas stovers from Bt+ plants had higher sugar (148.3 g kg−1 versus 115.9 g kg−1; P < 0.01) and lower NDF (592.7 g kg−1 versus 631.5 g kg−1; P < 0.05) contents than Bt maize. A comparison of the amino acid profiles showed higher phenylalanine content in kernels from the Bt+ plants (49.1 g kg−1 vs 47.8 g kg−1; P < 0.05) which was, however, not reflected in the protein content. The initial dry matter rumen degradability of the isogenic kernels was higher than that of Bt+ varieties (569.5 g kg−1 vs 543.7 g kg−1; P < 0.05), whereas the lower fibre content increased the dry matter (548.6 g kg−1 vs 526.6 g kg−1; P < 0.01) and protein (695.6 g kg−1 vs 647.9 g kg−1; P < 0.01) degradability after 24 h of incubation in stovers from Bt+ plants. The NDF degradability was higher in Bt corn varieties because of the higher proportion of hemicellulose in the total fibre. Copyright ¬© 2003 Society of Chemical Industry
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Keywords: chemical composition; rumen degradation; transgenic corn

Document Type: Research Article

Affiliations: Istituto di Scienze degli Alimenti e della Nutrizione, Facoltà di Agraria, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29100 Piacenza, Italy

Publication date: October 1, 2003

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