IngentaConnect Analytical composition and rumen degradability of isogenic and tr...

Authors: Rossi F.¹; Moschini M.¹; Fiorentini L.¹; Masoero F.¹; Piva G.¹

Source: Journal of the Science of Food and Agriculture, Volume 83, Number 13, October 2003 , pp. 1337-1341(5)

Abstract:

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

Keywords: transgenic corn; chemical composition; rumen degradation

Document Type: Research article

DOI: 10.1002/jsfa.1545

Affiliations: 1: Istituto di Scienze degli Alimenti e della Nutrizione, Facoltà di Agraria, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29100 Piacenza, Italy

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Analytical composition and rumen degradability of isogenic and transgenic corn varieties