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Effects of different cultivars of perennial ryegrass on intake,...

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Title Effects of different cultivars of perennial ryegrass on intake, digestibility and milk production in dairy cows.
Period 09 / 2000 - 10 / 2004
Status Completed
Dissertation Yes
URL http://library.wur.nl/wda/dissertations/dis3735.pdf
Research number OND1298861
Data Supplier METIS Wageningen Universiteit en Researchcentrum

Abstract

The project aims at finding relationships in the chain from grass sward characteristics to milk and manure production. Relationships will be analysed between grass characteristics, grass cultivar x management interactions, productivity and quality, grazing behaviour, grass intake and milk production under zero grazing (stall-feeding) as well as grazing conditions. Cultivars contrasting in morphological appearance, in (rate of) cell wall digestion and in concentrations of water soluble carbohydrates (wsc) will be used to test the hypothesis that these are the major factors determining intake and N use efficiency. In this approach the project aims to study and quantify the effects of grass quality on grazing behaviour and its relation with grass intake, rumen fill, rumen fermentation and rumen clearance, the distribution of N excretion between faecal N output, milk N output and urinary N output. The second, more applied objective is to develop calibration equations for Near Infrared Reflectance Spectroscopy (NIRS) in order to be able to rapidly predict grass growth, intake, nutrient utilization and milk production from NIRS spectra.

Related organisations

Related people

Supervisor Prof.dr.ir. M.J. Kropff
Supervisor Prof.dr.ir. P.C. Struik
Supervisor Prof.dr.ir. S. Tamminga
Co-supervisor Dr.ir. J. Dijkstra
Co-supervisor Dr.ir. A. Elgersma
Project leader Prof.dr.ir. P.C. Struik
Doctoral/PhD student Dr.ir. H.J. Smit

Classification

A21000 Agriculture and horticulture
A22000 Animal husbandry
D21300 Biochemistry

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