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| Krawutschke, Manuel; Weiher, Nina; Gierus, Martin; Thaysen, Johannes; Taube, Friedhelm. |
| Ensilage of red clover results in lower concentrations of non-protein nitrogen compared to other forage legumes. It is assumed that the polyphenol oxidase (PPO) activity in red clover is related to this effect. Therefore, a laboratory ensiling trial was carried out to quantify the changes in crude protein (CP) fractions during the ensiling process using the Cornell Net Carbohydrate and Protein System. At four cutting dates, fresh, wilted and ensiled herbage of three red clover genotypes and white clover grown in two systems (with and without mechanical stress) was sampled. The specific PPO activity was measured photometrically in fresh leaves of the plants. Concentrations of fraction A increased from 130-197 g/kg CP to 372-544 g/kg CP during the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops. |
| Ano: 2011 |
URL: http://orgprints.org/17345/3/Krawutschke_17345.pdf |
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| Kleen, Jana; Gierus, Martin; Taube, Friedhelm. |
| The objective of this study was to compare the agronomic performance of different forage legume species submitted to different management systems, i.e. grazing, silage-cut and simulated grazing to find alternatives for white clover. The experiment was established in 2003 and 2004 as binary swards with perennial ryegrass (Lolium perenne L.) as the companion grass with three replicates in two different sites on the experimental station “Lindhof” of the University of Kiel. Legume species were arranged within each management system as completely randomised blocks. Results of agro-nomic performance of the first production years in 2004 and 2005 (DM-yield, botanical composition, N-yield, N-content) are presented for white clover swards (Trifolium repens L.), red... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds Beef cattle. |
| Ano: 2007 |
URL: http://orgprints.org/9573/1/9573_Kleen_Vortrag.pdf |
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| Eickler, Birgit; Gierus, Martin; Taube, Friedhelm. |
| Several studies show that polyphenol oxidase (PPO) in red clover reduces proteolysis and increases nitrogen use efficiency of the ruminant, but not much is known about factors affecting PPO activity in red clover plants. PPO activity was analysed in red clover plants from legume-grass mixtures subjected to three different management systems. The cutting frequency (3 or 5 cuts) caused only minor differences in PPO activity, whereas a significant increase in PPO activity could be proved for the rota-tional grazing system (RG), compared to the simulated grazing system (SG, 5 cuts) with equal use frequency. Results indicate a metabolic adaptation of the red clover plants due to the grazing process itself, leading to a control factor which has to be considered... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Feeding and growth. |
| Ano: 2007 |
URL: http://orgprints.org/9597/1/9597_Eickler_Vortrag.pdf |
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| Weiher, Nina; Krawutschke, Manuel; Gierus, Martin; Taube, Friedhelm. |
| Increasing protein quality of forages in ruminant nutrition may contribute to reduce nitrogen losses in specialized dairy farms in Europe. Red clover is known to have high polyphenol oxidase (PPO) activity among forage legumes. The enzyme oxidizes phenols to quinones. These highly reactive quinones form stabilized quinone-protein-complexes, protecting protein from fast degradation. The objective of this study was to investigate the effect of the specific PPO activity on the protein fractions of twelve red clover genotypes in two management systems (without and with mechanical stress) in pure red clover swards. The results showed that genotype seem to be of minor importance compared to the variation in PPO activity induced by mechanical stress and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops. |
| Ano: 2011 |
URL: http://orgprints.org/17397/3/Weiher_17397.pdf |
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