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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 405063
Title Changes in fatty acid content and composition in silage maize during grain filling
Author(s) Khan, N.A.; Cone, J.W.; Pellikaan, W.F.; Khan, M.A.; Struik, P.C.; Hendriks, W.H.
Source Journal of the Science of Food and Agriculture 91 (2011)6. - ISSN 0022-5142 - p. 1041 - 1049.
Department(s) Animal Nutrition
Crop and Weed Ecology
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) whole-plant digestibility - total mixed ration - dairy-cows - lipid-metabolism - leaf senescence - stem characteristics - milk - forages - profile - corn
Abstract Background: The stage of maturity at harvest has a major effect on the fatty acid (FA) content and composition of forage plants consumed by dairy cows. The present study investigated the dynamics of FA content and composition in stover (leaves and stem) and ears (cob, shank and husks) of two maize genotypes (G2 and G6) grown on sandy and clay soils and harvested at 14, 42, 56, 70 and 84 days after flowering (DAF). In addition, the FA content and composition of six maize genotypes (G1-G6) grown on the two soil types were compared at the normal harvest time of early genotypes in the Netherlands (70 DAF). Results: The contents of total FAs and major individual FAs in both stover and ears changed significantly (P <0.001) during the grain-filling period (14-84 DAF). In stover the contents of C16:0, C18:2, C18:3 and total FAs declined (P <0.001) while those of C18:0 and C18:1 increased (P <0.001) with progressive grain filling. The rate of decline in C18:3 and total FA contents was slower during 14-56 DAF as compared with 56-84 DAF. In ears, the contents of C16:0, C18:1, C18:2 and total FAs increased up to 56 DAF and then remained more or less constant until 84 DAF. At 70 DAF the content of polyunsaturated fatty acids (PUFAs) in both stover and ears did not differ among the six genotypes. However, the average contents of C16:0, C18:3 and total FAs in stover were higher (P <0.05) on clay soil, whereas those of C18:0 and C18:1 were higher on sandy soil. Conclusion: The results demonstrate that the maximum PUFA content in silage maize is harvested around 56 DAF, in the present study at a T(sum) of 927 °C.d or at an ear dry matter content of 440 g kg(-1) , which is before the onset of rapid senescence. Any further delay in harvesting will cause a rapid decline in C18:3 content in maize silages.
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