Prediction of the chemical and physical characteristics oand nutritive value of wheat by near infrared reflectance spectroscopy

Bronagh Owens (1) , Elizabeth Ball (nee Mccann) (2) , Kelvin John Mccracken , Rae Park (3)

1 AFESD
2 AFESD
3 AFBI

The aims of this study were to investigate the potential of near infrared reflectance spectroscopy (NIRS) to predict the chemical and physical characteristics of wheat and also to predict the nutritive value of wheat for broiler chickens. 164 wheat samples, collected from a wide range of different sources (England, Northern Ireland and Canada), varieties and years, were used in this study.A wide range of wheat chemical and physical parameters were measured. 94 of the wheat samples were selected for inclusion in three bird trials. Birds were housed in individual wire metabolism cages from 7-28d and offered water and food ad libitum. Dry matter intake (DMI), live weight gain (LWG) and gain:feed were measured weekly. A balance collection was carried out from 14-21d for determination of apparent metabolisable energy (AME), ME:gain and dry matter retention. At 28d the birds were humanely killed, the contents of the jejunum removed for determination of in vivo viscosity and the contents of the ileum removed for determination of ileal dry matter, starch and protein digestibility. The wheat samples were scanned as whole and milled wheat, both dried and undried and NIRS calibrations, first excluding and then including the Canadian wheat samples, were developed. NIRS calibrations for milled wheat samples may be useful for determining specific weight (R2cv = 0.75, for milled wheat dried), nitrogen (R2cv = 0.983 for milled and dried) and rate of starch digestion (R2cv = 0.791 for milled, dried and undried). NIRS calibrations for whole wheat samples (undried) may be useful for determining wheat nutritive value, with good predictions for live weight gain (R2cv = 0.817) and feed conversion efficiency (R2cv = 0.825). Inclusion of the Canadian wheat samples to the NIRS analysis provided additional robust calibrations for gross energy (R2cv = 0.86, dried and milled) and starch content (R2cv = 0.79, undried and milled). This study shows that NIR is a useful tool in the accurate and rapid determination of wheat chemical parameters and nutritive value and could be extremely beneficial to both the poultry and wheat industry. Further extension of the dataset is recommended to further validate these findings.

Mots clés: Life Sciences

Bronagh Owens, Elizabeth Ball (nee Mccann), Kelvin John Mccracken, Rae Park. Prediction of the chemical and physical characteristics oand nutritive value of wheat by near infrared reflectance spectroscopy. British Poultry Science, 2009, 50 (01), pp.103-122. ⟨10.1080/00071660802635347⟩. ⟨hal-00545341⟩