Buckwheat conservation as hay or silage: agronomic evaluation, nutritive value, conservation quality, and intake by...

Buckwheat was conserved either as silage at two dry matter (DM) levels attained with (wilted silage (WS), 313 g/kg) and without wilting (direct cut silage (DS), 171 g/kg) or as hay (856 g/kg) and was included in the isonitrogenous and isocaloric total mixed ration (TMR) of four groups of six Saanen goats each at the rate of 200 g/kg DM. Ensiling buckwheat at low DM led to a poorly fermented silage with higher ammonia-N and butyric acid contents and extensive growth of enterobacteria and mold-yeast than WS. The DM recovery of DS was lower than that of WS. The total phenol (TP) content of buckwheat was also preserved more efficiently in hay than in DS. The nutritive value of hay was higher than that of the silages because hay had less fiber contents but more non-fiber carbohydrates and total digestible nutrients. The decrease in nutritive value in buckwheat silages, in particular for DS, increased the nutrient intensity in the concentrated feed. The DM intake of goats fed DS TMR tended to be lower (P=0.09) than that of the goats fed WS TMR in the first week of the experiment, but the goats quickly adapted to the poorly fermented silage and did not reduce their overall DM intake. The DS, WS, and hay TMRs did not affect fat corrected milk yield but increased the milk TPs compared to a TMR with legume-grass hay. It was concluded that buckwheat hay and silages are well accepted by dairy goats, but the DM content of buckwheat at ensiling may require over 330 g/kg for producing well-fermented silages.