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2009 - Luiz Carlos Vianna Reis Junior.pdf: 505730 bytes, checksum: 85fc6aba67104fc7876da3de318aed17 (MD5)
Previous issue date: 2009-02-19 === This experiment was accomplished in the Animal Nutrition and Pastures Department in the Institute of Animal Science of the Rural Federal University of Rio de Janeiro. The effects of increasing levels of urea addition were evaluated on the chemical-bromatologic and microbiologic composition of Coast-cross hay. The hay was treated with 5 levels of urea (0, 0,5, 1,0, 1,5 e 2,0% of dry matter), during 28 and 35 days. The experimental design used was the completely randomized with five treatments in a split-plot design, two ammonization periods (28 and 35 days) and three replications. Urea (45% N) was used and diluted in the proportion 1 to 4 parts of water. The treated hay was stored in sealed plastic bags (3kg/bag) and, when opened, samples were collected for chemical and microbiological analysis. It was verified that the crude protein levels increased linearly in function of higher doses of urea and period, which suggested an elevation of the nitrogen level available in the material. The addition of urea promoted a significant reduction (P<0,05) on the levels of neutral detergent insoluble protein (NDIP) and acid detergent insoluble protein (ADIP). There was no influence of the ammonization on the levels of neutral detergent fiber (NDF) and hemicelluloses (HEM). The increasing levels of urea were efficient on the reduction of colonies generator unities, keeping them under tolerable levels aiming the preconized limits to vegetable health. The present experiment showed that the process of ammonization is efficient on the improvement of the chemical composition of coast-cross hay. === Este trabalho foi realizado no Departamento de Nutri??o Animal e Pastagens, do Instituto de Zootecnia da Universidade Federal Rural do Rio de Janeiro. Avaliaram-se os efeitos da adi??o de ureia em n?veis crescentes sobre a composi??o qu?mico-bromatol?gica e microbiol?gica do feno de coast-cross. O feno foi tratado com 5 n?veis de ureia com base na mat?ria seca durante 28 e 35 dias de amoniza??o. O delineamento experimental utilizado foi o inteiramente casualisado com um arranjo em parcelas subdivididas, com cinco tratamentos (0, 0,5, 1,0, 1,5 e 2,0% de ureia na mat?ria seca), dois per?odos de amoniza??o (28 e 35 dias) e tr?s repeti??es. Foi utilizada ureia pecu?ria (45% N), dilu?da na propor??o de 4 partes de ?gua para cada parte de ureia. O feno tratado foi armazenado em sacos pl?sticos (3 kg feno/saco), lacrado e ap?s abertura, foram coletadas amostras para as an?lises qu?micas e microbiol?gicas do material. Verificou-se efeito linear positivo (P<0,05) para os teores de prote?na bruta em fun??o dos n?veis crescentes de ureia, sugerindo uma eleva??o nos teores de nitrog?nio dispon?vel no material amonizado. A adi??o de ureia promoveu redu??o significativa (P<0,05) nos teores de prote?na insol?vel em detergente neutro e prote?na insol?vel em detergente ?cido. Os n?veis crescentes de ureia foram eficientes na diminui??o das unidades formadoras de col?nias, reduzindo-as a n?veis aceit?veis ao limite preconizado como par?metro de higiene para vegetais. N?o houve influ?ncia da amoniza??o sobre os teores de fibra em detergente neutro, hemicelulose para os n?veis de ureia utilizados. O presente trabalho mostrou que o processo de amoniza??o ? eficiente na melhoria da composi??o qu?mica do feno de coast-cross.
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