Substituição do milho por milheto sobre as características de carcaça e carne de novilhos confinados de diferentes predominâncias genéticas
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2013-11-10
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Universidade Federal de Goiás
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This study aimed at assessing the carcass and meat traits as well as fatty acid
profile of crossbred steers of European or zebu genotypic predominance, finished
in feedlot, fed diets with high percentage of concentrate (80%) containing different
levels of grounded millet grain as replacement for grounded corn grain (0, 33, 66
and 100%). We allocated in 16 collective pens 45 steers with European
predominance and 44 with zebu-predominance, with average initial weight of
317.8 and 320.7 kg, respectively, and average age of 21 month. At the end of the
finishing period, we slaughtered six animals of each genetic group, randomly
chosen within each level of replacement of corn by millet grain. The experimental
design was completely randomized with treatments in a 4x2 factorial arrangement
using six replicates. The replacement of corn grain by millet grain did not
significantly affect slaughter weight (480.4 kg), hot carcass weight (259.5 kg),
carcass yield (54.1%) and subcutaneous fat thickness (3.95 mm). Steers with
predominant European genotype showed significantly higher values for slaughter
weight (507.6 vs. 453.3 kg), hot carcass weight (269.6 vs. 249.3 kg) and
Longissimus dorsi area (65.34 vs 56.83 cm2); however, they had lower carcass
yield (53,2 vs. 55,00%). Increasing the proportion of millet in the diet linearly
increased the arachidic (C20:0), heneicosanoic (C21:0), linolenic (C18:3 n-3)
and di-homo linolenic (C20:3 n-6) fatty acids. European steers meat showed less
content of myristic (C14:0), heneicosanoic (C21:0) and linolenic (C18:3 n-6) fatty
acids. The total concentration of saturated (45.2%), monounsaturated (41.2%) and
polyunsaturated (8.7%) fatty acids and, monounsaturated/saturated (1.09) and
polyunsaturated/saturated (0.18) relationship were not affected by the factors
studied. Millet grain can be used in replacement of corn grain for finishing steers
since it does not change carcass traits of economic interest. The increase in the
percentage of millet grain in the diet of European and zebu crossbred steers
improves the ratio between n-6/n-3 fatty acids.
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SILVA, Rodrigo Medeiros da. Substituição do milho por milheto sobre as características de carcaça e carne de novilhos confinados de diferentes predominâncias genéticas. 2013. 101 f. Tese (Doutorado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2013.