Chemical composition and in sacco degradation kinetics of four common biowastes in Canterbury

Abstract

This research aimed to quantify the chemical composition and rumen degradation kinetics of three local and one imported bio-waste using the in sacco nylon bag technique. Triplicate samples of oven-dried biowastes ground to 4 mm were incubated in therumens of four cows for 0 h, 2 h, 4 h, 6 h, 12 h, 24 h and 72 h. Bags attached to chains in descending order were placed in theventral sac of the rumens. The soluble fractions (0 h) of dry matter were lowest for brewer’s grains (BG) with 8.4% ± 0.88%,followed by palm kernel expeller (PKE) and potato waste (PW) with 25.4% ± 0.27% and 29.9% ± 1.08%, respectively. Apple pomace(AP) had the highest soluble fraction (54.7% ± 1.11%). For crude protein (CP), the rate of degradation was 9.5% ± 1.0%/h forBG, 5.0% ± 1.1%/h for AP, 0.1% ± 0.0%/h for PKE and 21.1% ± 2.0%/h for PW. These findings demonstrate the variability of localand imported biowastes and provide useful information on degradation kinetics which can be used for formulating diets