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Analytical composition and rumen degradability of isogenic and transgenic corn varieties
Author(s) -
Rossi F,
Moschini M,
Fiorentini L,
Masoero F,
Piva G
Publication year - 2003
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.1545
Subject(s) - genetically modified maize , rumen , dry matter , bacillus thuringiensis , zoology , hemicellulose , chemistry , fodder , agronomy , biology , food science , genetically modified crops , botany , lignin , fermentation , biochemistry , transgene , bacteria , gene , genetics
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