Chemical composition and in vivo digestibility of NaOH treated or untreated lucerne straw
1993
Bonomi, A. | Sabbioni, A. | Superchi, P. | Mazzali, I. (Parma Univ. (Italy). Istituto di Zootecnica, Alimentazione e Nutrizione)
The aim of the research was to verify if chemical treatment with NaOH was able to improve the nutritive value of lucerne straw. The trial was carried out on 2nd cut lucerne (Romagnola Ecotype) of grown until seed maturity and then thrashed. The chopped straw was in part treated with a 30% NaOH solution (10 l/100 kg of straw) and after 30 d was used in in vivo digestibility trials on Sardinian wethers. The chemical treatment increased moisture, ash and pH and decreased crude fibre, NDF, ADF, ADL and gross energy; the mineral content varied only for sodium in treated straw. After the NaOH treatment the digestibility of dry matter (7.91%), and so NDF (19.36%), ADF (14.18%), gross energy (10.23%) (P lower than 0.01) improved, as did voluntary intake (12.10%) (P lower than 0.01). The animals fed with treated straw had higher N intake, fecal N and urine N (P lower 0.05). The nutritive value of lucerne straw, NaOH treated or untreated, was respectively, 0.60 and 0.51 milk FU and 0.50 and 0.40 meat FU/kg DM
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