Bibliographic citations
Haro, J., (2017). Intensidad de pastoreo y contenido de taninos, degradibilidad ruminal y digestibilidad in vitro de Parastrephia lepidophylla (Wedd) Cabrera [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/2897
Haro, J., Intensidad de pastoreo y contenido de taninos, degradibilidad ruminal y digestibilidad in vitro de Parastrephia lepidophylla (Wedd) Cabrera [Tesis]. : Universidad Nacional Agraria La Molina; 2017. https://hdl.handle.net/20.500.12996/2897
@mastersthesis{renati/1113463,
title = "Intensidad de pastoreo y contenido de taninos, degradibilidad ruminal y digestibilidad in vitro de Parastrephia lepidophylla (Wedd) Cabrera",
author = "Haro Reyes, José Antonio",
publisher = "Universidad Nacional Agraria La Molina",
year = "2017"
}
This study focus on plant – herbivore interaction between Parastrephia lepidophylla and llamas under the hypothesis that grazing induces defensive responses in shrubs at plant secondary metabolites (PSM) level, and these PSM would affect foliage digestion when consumed by herbivores. The research was performed in Quimsachata Station at INIA Puno and was divided into 3 essays. The first one consisted in a phytochemical screening of P. lepidophylla. In the second one, the shrubs where applied simulated grazing intensities, which combined grazing frequencies (30 and 60 days) and utilization levels (25 and 50% of foliage), also a control without grazing. The third one evaluated in sacco rumen degradability and in vitro dry matter digestibility (IVDMD) of P. lepidophylla in llamas. Essay 1 showed that P. lepidophylla constains flavonoids, triterpenes, phenols, tannins, quinones, redactor sugars and amino acids. Essay 2 probed that grazing frequency diminish tannin concentration (4.37 vs4.77 g Total Tannins/ Kg DM for every 30 and 60 days grazing respectively), while in essay 3 it is the utilization level which affects rumen degradability at 48 hours and IVDMD. Degradability results were 65.49% y 63.25% and digestibility results were 46.27% y 41.41%, both cases corresponding to 50 and 25% utilization levels. There is also an interaction between grazing frequency and utilization found among degradability means. In conclusion, tannins would not be the defensive mechanism of P. lepidophylla, the higher utilization levels would favor its degradation and digestibility in llamas and P. lepidophylla responds independently according to the damage intensity received. Key words: plant-herbivore interaction, shrubs, secondary metabolites
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