Implications de l'azote endogène dans les profils continus de l'ammoniaque ruminale chez la vache tarie

dissertn: Diss. Doct

Influence de diff rents param(tres physiologiques sur la dimen- sion moyenne des particules f cales chez les ovins (effets de l'betage,de l'asendance paternelle et de la finesse de hachage de

SIGLEBSE B226231P / UCL - Université Catholique de LouvainBEBelgiu

Nutritive value of some tropical grasses used by traditional small farms in the highlands of Burundi.

The objective was to estimate-according to the French feeding system-the nutritive value of three tropical grasses (Eragrostis olivacea, Setaria sphacelata and Tripsacum laxum) used in traditional small farms of Burundi. Dry matter (DM) yield was monitored on anti-erosive hedges or on small fields in 60 small farms for eight consecutive years. DM intake and digestibility values were measured on seven steers or seven male sheep. Degradability values were determined on three sheep. S. sphacelata exhibited higher DM yield (t ha(-1)), energy (UF, kg(-1) DM) and protein (PDI, g kg(-1) DM) values (17.3, 0.73 and 68, respectively) than T. laxum (9.11, 0.64 and 47) and E. olivacea (not determined, 0.46 and 42). The UF and PDI intakes of these grass species were able to meet only 51% to 92% of the energy and 59% to 133% of the protein requirements for maintenance of the experimental animals

New applications of MIR spectrometry: Quality Assurance practices with new parameters in raw milk analysis

Mid InfraRed (MIR) spectrometry is traditionally applied for quantitative determination of major components of milk such as fat, protein or lactose. For these “traditional” parameters, MIR Filter apparatus techniques have been used for a long time. They used simple models to predict these parameters using a very low number of wavelength. Recently, Fourier-transform infrared spectroscopy (FTIR), a more complex technique, has been proposed. FTIR apparatus collect high-spectral-resolution data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer, which measures intensity over a narrow range of wavelengths at a time. A Fourier transform (a mathematical process) is required to convert the raw data into the actual spectrum. Thanks to additional prediction models developed by researchers and instrument manufacturers, FT-IR spectra can be used beyond quantitative determination of major components of milk such as fat, protein or lactose, to measure other dairy components such as fatty acids and minerals, and also to measure qualitative parameters. However, traditional calibration procedures developed with filter apparatus need to be adapted to respond to the more complex models used. This document focuses on the required checks with the implementation of new quantitative applications and how the quality assurance of the results can be assured. New approaches are presented

Additivity of ileal endogenous losses and real digestibilities of amino acids determined by means of the 15N-labelled diets technique in growing pigs fed various feedstuffs.

peer reviewedThe ileal endogenous losses and the real digestibilities of protein and amino acids from wheat, barley, pea, faba bean and rapeseed meal were determined in growing pigs by means of the 15N-labelled diet technique. The ileal real digestibilities were additive when the feedstuffs were mixed together, in contrast to the ileal endogenous losses which, apart from endogenous lysine excretion, did not show any additivity