substituição do milho moído por casca de soja na ração de vacas leiteiras em confinamento replacement of ground corn by soybean hulls in the diets for confined lactating cows

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ID: 155332
2007
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Abstract
Trinta e seis vacas holandesas no terço médio da lactação, 123 dias em lactação (DEL), foram utilizadas para avaliar a substituição do milho moído (MM) por casca de soja (CS) em rações contendo silagem de milho como volumoso principal e polpa cítrica como parte da fonte energética. Foram avaliadas rações com 0, 10 e 20% de substituição do milho moído por casca de soja na ração, na MS da ração completa (%MS): CS 0 - 0% de CS e 20% de MM; CS 10: 10% de CS e 10% de MM; e CS 20 - 20% de CS e 0% MM. Características de desempenho e metabolismo como consumo de MS, produção e composição do leite, concentrações de N-uréico no leite e níveis de glicose plasmática foram avaliadas. As vacas foram distribuídas a um delineamento experimental em quadrado latino 3 ´ 3, com de 12 repetições e de acordo com a produção de leite, DEL e a paridade. A inclusão de CS nas rações não afetou o consumo de MS (22,84 kg/dia), a produção de leite (28,33 kg/dia) ou a produção de leite corrigida para 3,5 % gordura (28,48 kg/dia). No entanto, aumentou linearmente a produção total de gordura (kg/dia) e a decresceu linearmente a concentração de N-uréico no leite. A substituição do milho moído por casca de soja na alimentação de vacas leiteiras pode ser uma alternativa interessante, desde que o preço do subproduto seja competitivo.
Thirty six mid lactating Holstein cows, 123 days in milk (DIM), were used to evaluate the substitution of ground corn (GC) by soybean hulls (SH) for in total mixed diets containing corn silage as the main forage source and citrus pulp as part of the energy source. The replacement of 0, 10 and 20% of ground corn by soybean hulls in total mixed diets (%DM) were evaluated: SH 0 - 0% SH and 20% GC, CS 10: 10% SH and 10% GC, and CS 20 - 20% SH and 0% GC. Performance and metabolism characteristics such as dry matter intake, milk yield and composition, milk urea N concentration, and plasma glucose were evaluated. Cows were assigned 3 x 3 Latin Square experimental design, with 12 replications, according to milk yield, DIM and parity. No effects were observed by the inclusion of SH in the diets on DM intake (22.84 kg/day), milk yield (28.33 kg/day) or 3.5% fat corrected milk (28.48 kg/day). However, linearly increased total milk fat production and linearly decreased MUN concentration in milk. The replacement of ground corn per soybean hulls in the feeding of lactating cows could be good alternative since byproduct cost be competitive.
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Authors Alexandre Mendonça Pedroso, Flávio Augusto Portela Santos, Carla Maris Machado Bittar, Alexandre Vaz Pires, Junio Cesar Martinez
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Journal european journal of lipid science and technology
Year 2007
DOI
10.1590/S1516-35982007000700025
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000700025
Keywords
milk production and composition

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