Effect of wilting on biochemical and microbiological changes in Kikuyu (Pennisetum clandestinum Hochst) silage

Abstract

Small‐scale laboratory silos were used to study the fermentation process of Kikuyu (Pennisetum clandestinum Hochst) silage prepared from grass containing 25% and 40% dry matter. Silage made from grass containing 40% dry matter was found to be better preserved and of better quality than silage made from wetter grass. The better preservation and quality of the drier grass was reflected in the lower production of ammonia‐N (0,19 vs 0,26%) and total volatile fatty acids (5,48 vs 16,27%). Better quality was also reflected in the higher content of crude protein (16,3 vs 14,4%), true protein (9,0 vs 7,0%), residual total non‐structural carbohydrates (2,4 vs 2,3%), and in vitro dry matter digestibility (58,7 vs 55,2%). Both low and high dry matter silages had a low lactic‐acid content and high pH throughout fermentation. Both silages were of the acetate type.

Klein laboratoriumsilos is gebruik in ‘n studie van die fermentasieproses van Kikoejoe (Pennisetum clandestinum) kuilvoer. Die gras het 25% en 40% droemateriaal bevat. Kuilvoer van gras wat 40% droemateriaal bevat het was beter gepreseveer en van ‘n beter gehalte as kuilvoer gemaak van die natter gras. Die beter preservering en gehalte van die droer gras word weergegee in die laer produksie van ammoniak‐N (0,19 tcenoor 0,26%) en totale vlugtige vetsure (5,48 tcenoor 16,27%). Beter kwaliteit word ook weergegee in die hoer inhoud van ruprote'icne (16,3 tecnoor 14,4%), ware prote'icne (9,0 teenoor 7,0%), oorblywende totale nie‐strukturele koolhidrate (2,4 teenoor 2,3%) en in vitro droe materiaal‐verteerbaarheid (58,7 teenoor 55,2%). Beide die lac en hoc droe materiaal‐kuilvoere het ‘n lae melksuurinhoud en ‘n hoe pH gedurende die hele fermentasie proses gehad. Albei kuilvoere was van die asetaattipe.

Additional index words:

• Grass‐silage
• Kikuyu
• wilting
• chemical composition