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Intake, growth and feed conversion efficiency of finishing beef cattle offered diets based on triticale, maize or grass silages, or ad libitum concentrates
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2011
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Intake, growth and feed conversion efficiency of finishing beef cattle offered diets based on triticale, maize or grass silages, or ad libitum concentrates. P. O'Kiely. IJAFR Vol 50. No. 2 (2011), pp. 189-207
Abstract
The intake, growth and feed conversion efficiency of finishing cattle offered whole-crop
triticale silage, harvested at different stubble heights, or maize silage, supplemented
with different amounts and forms of crude protein, were compared with those of cattle
offered grass silage or concentrate ad libitum. Ninety-eight continental crossbred steers
(mean (s.d.) initial live weight 509 (38.6) kg) were allocated among 7 treatments in a
randomized complete-block design: triticale silage from a crop harvested to a 14 (TS-L)
or 35 (TS-H) cm high stubble, maize silage supplemented with a low (MS-LS) or high
(MS-HS) protein concentrate, or with approximately half of the supplementary crude
protein replaced by urea (MS-SU), grass silage (GS) or concentrate offered ad libitum
(ALC). Each silage was offered ad libitum for 134 days, supplemented with 3 kg concentrate
per head daily. Carcass gain did not differ (P>0.05) between animals on treatments
TS-L and TS-H, but the carcass gain associated with TS-L was lower (P<0.05)
than with GS or MS-HS, and with TS-H compared with MS-HS. Carcass gain was lower
(P<0.05) for steers on GS compared to MS-HS, there were no differences (P>0.05)
among the values for MS-LS, MS-HS and MS-SU; the carcass gain associated with
ALC was the highest (P<0.001). The feed efficiency for carcass gain for the animals
on TS-L, TS-H, GS, MS-LS, MS-HS, MS-SU and ALC was 44.1, 48.2, 60.8, 59.3, 68.3,
59.8 and 90.1 (s.e. 4.26) kg/t total DM intake, respectively (P<0.001). It is concluded
that the ranking on nutritive value was TS<GS<MS<ALC. Elevating the cutting
height of triticale conferred little benefit. Half the soybean meal in the barley-based supplement to maize silage could be replaced by barley plus urea without a negative
effect on animal performance.