Use of MIR spectrometry for technological properties prediction of milk samples from Walloon dairy cows

Conference (2012, October 12)

2. Variétés - 1. Froment d'hiver

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc - Céréales - Gembloux (2012, September 06)

Mid-infrared prediction of milk titratable acidity and its genetic variability in first-parity cows

in Book of Abstracts of the 63rd Annual Meeting of the European Federation of Animal Science (2012, August)

Coagulation of milkhas a direct effect on cheese yield. Among several parameters, titratable acidity of milk (TA) influences all the phases of milk coagulation. In order to study the genetic variability ... [more ▼]

Coagulation of milkhas a direct effect on cheese yield. Among several parameters, titratable acidity of milk (TA) influences all the phases of milk coagulation. In order to study the genetic variability of this trait on a large scale, mid-infrared (MIR) chemometric methods were used to predict TA. A total of 507 milk samples collected in the Walloon Region of Belgium from individual cows were analyzed using a MIR spectrometer. TA was recorded as Dornic degree. An equation to predict TA from milk MIR spectrum was developed using partial least squared regression after a first derivative pre-treatment applied to the spectra to correct the baseline drift. During the calibration process, 45 outliers were detected and removed from the calibration set. The TA mean of the final calibration set was 16.62 (standard deviation (SD) = 1.80). The coefficient of determination (R²) was 0.82 for the calibration with a standard error (SE) of 0.76. A cross-validation (cv) was performed (R²cv = 0.81 with SEcv = 0.80). This equation was then applied on the spectral database generated during the Walloon routine milk recording. The variances components were estimated by REML using single-trait random regression animal test-day model. The dataset used included 33,717 records from 9,191 Holstein first-parity cows; the TA mean was 17.05 (SD = 1.35) and TA ranged from 12.83 to 20.87. Estimated daily heritabilities ranged from 0.43 at 5th day in milk to 0.59 at 215th day in milk indicating potential of selection. Further research will study phenotypic and genetic correlations between TA and milk production traits. [less ▲]

2. Variétés - 1. Froment d'hiver

in Livre blanc: Céréales-Gembloux - Informations avant les semis (2011, September 08)

Froment 2010 : une réédition de 2006 ?

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2010, September 09)

Use of NIR spectroscopy for the determination of internal quality of entire apples

Poster (2009, November)

Froment 2009: de bons rendements mais une piètre qualité boulangère

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2009, September 10)

Variétés: froment d'hiver

Conference given outside the academic context (2008)

Qualité froment: L'amidon de blé, une matière première agricole aux caractéristiques et propriétés diverses mais maîtrisables

in Livre Blanc: Céréales - Gembloux (2008, February 20)

Influence of nitrogen fertilizer treatments on soft wheat starch characteristics

in Weegels, P. L.; Courtin, C. M.; Arrachid, A. (Eds.) et al Consummer driven cereal innovation: where science meets industry (2008)