Browsing IJAFR, volume 43, 2004 by Subject "Live-weight gain"
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Comparison of flail-harvested, precision-chopped and round-bale silages for growing beef cattle(Irish Journal of Agricultural and Food Research, 2004)The effects of silage conservation method on silage composition and animal performance were examined in two experiments. In Experiment 1, unwilted, flail-chopped silages made with or without an additive (sodium nitrite and hexamethylene tetramine) were compared with wilted, round-bale silage. The dry matter (DM) concentration of round bale silage (460 g/kg) was higher than that of flail silage (214 g/kg) and this restricted fermentation and N solublisation. When fed to growing cattle, intake (P<0.01), live-weight (LW) gain (P<0.001) and LW gain to feed ratio (P<0.05) were greater for round-bale silage than for flail silage. In Experiment 2, flail-harvested silage was compared with wilted, precision-chopped and round-bale silages conserved either without or with pre-slicing immediately before baling. The DM concentration of flail, precision-chopped and round-bale silages were 163, 334 and 468 g/kg, respectively. Fermentation in flail silage was more extensive than in precision-chopped and particularly round-bale silages, but insoluble-N concentration was unaffected. Round-bale silage was more digestible (P<0.05) than flail or precision-chopped silages. Voluntary intake was higher for steers fed round-bale silages compared to flail silage (P<0.05), while intake of steers fed precision-chopped silage was intermediate (P>0.05). Steers fed round-bale silages had higher LW gain (1.0 kg/day) than those fed flail (0.7 kg/day) or precision-chopped silage (0.8 kg/day; P<0.05). Efficiency of utilization of DM for LW gain was similar for all silages. Pre-slicing at baling had no effect on animal performance. It is concluded that the increased performance by cattle offered silages made by the wilted round-bale system was largely due to higher voluntary intake.