Digestibility and degradability of diets with different milling degrees ground ear corn

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T19:06:18Z No. of bitstreams: 1 S1516-35982001000600033.pdf: 198256 bytes, checksum: e639f681b120292cca2621d9e6205676 (MD5) Made available in DSpace on 2013-08-22T19:06:18Z (GMT). No. of bitstreams: 1 S1516-35982001000600033.pdf: 198256 bytes, checksum: e639f681b120292cca2621d9e6205676 (MD5) Previous issue date: 2001-10-01 Made available in DSpace on 2013-09-30T18:02:13Z (GMT). No. of bitstreams: 2 S1516-35982001000600033.pdf: 198256 bytes, checksum: e639f681b120292cca2621d9e6205676 (MD5) S1516-35982001000600033.pdf.txt: 39364 bytes, checksum: a2dd02b3440a122ef1399b1168d9d545 (MD5) Previous issue date: 2001-10-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:18:46Z No. of bitstreams: 2 S1516-35982001000600033.pdf: 198256 bytes, checksum: e639f681b120292cca2621d9e6205676 (MD5) S1516-35982001000600033.pdf.txt: 39364 bytes, checksum: a2dd02b3440a122ef1399b1168d9d545 (MD5) Made available in DSpace on 2014-05-20T13:18:46Z (GMT). No. of bitstreams: 2 S1516-35982001000600033.pdf: 198256 bytes, checksum: e639f681b120292cca2621d9e6205676 (MD5) S1516-35982001000600033.pdf.txt: 39364 bytes, checksum: a2dd02b3440a122ef1399b1168d9d545 (MD5) Previous issue date: 2001-10-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) O objetivo deste trabalho foi determinar a digestibilidade, usando óxido crômico (Cr2O3) e FDN indigestível, como indicadores, e a degradação de dietas compostas de milho desintegrado com palha e sabugo (MDPS) em três graus de moagem (3/8, 9/16 e 3/4 de polegadas) e duas fontes protéicas, o farelo de amendoim e o glúten de milho-20, em um experimento fatorial com seis tratamentos. Os graus de moagem de MDPS e as fontes protéicas não tiveram efeito sobre pH, concentração de amônia ruminal, digestibilidade das rações (matéria seca - MS, proteína bruta - PB, extrato etéreo - EE, amido, fibra em detergente neutro - FDN e fibra em detergente ácido - FDA) e degradação ruminal de matéria seca e amido. Os coeficientes de digestibilidade para todos os nutrientes diferiram entre os dois indicadores, sendo maiores para o Cr2O3. Houve interação significativa entre fonte protéica e graus de moagem do MDPS para pH e amônia, somente para a moagem 9/16 polegadas, com menor pH ocorrendo com o farelo de amendoim e a menor concentração de amônia com o glúten de milho-20. Para a degradação ruminal da MS não houve efeito de grau de moagem de MDPS, mas houve efeito de fonte protéica, com degradação efetiva maior com o uso do glúten de milho-20. Quanto à degradação ruminal de amido do MDPS incubado com o concentrado protéico, não houve diferença entre as fontes protéicas, mas, ao se incubar somente o MDPS, a degradação do amido foi maior em animais que estavam recebendo glúten de milho-20. This work was carried out to evaluate the digestibility, using Cr2O3 and indigestible neutral detergent fiber (INDF), as markers, and also the degradability using ground ear corn (GEC). Six treatments were used in a factorial design, with three milling degrees (3/8, 9/16 and 3/4) of ground ear corn and peanut meal or corn gluten feed as protein sources. The milling degrees of ground ear corn did not have effect on pH, N-NH3 , digestibility (dry matter - DM, crude protein - CP, extract ether extract - EE, starch, neutral detergent fiber - NDF, acid detergent fiber - ADF) and ruminal degradability for DM and starch. Digestibility coefficients differed between two markers and were higher for Cr2O3. There was significant interaction for pH and N-NH3 between protein sources and milling degree, but only on 9/16, with lowest pH value for peanut meal and lowest N-NH3 concentration for corn gluten feed. There was no effect of milling degree on rumen degradability of dry matter, but there was protein sources effect, and the degradability was higher on corn gluten feed treatments. The starch degradability of GEC plus protein source did not differ between protein sources, but differed when only GEC on nylon bags was used, the starch degradability was higher in corn gluten feed treatments. FAPESP UNESP FCAV Depto de Zootecnia CNPq UNESP FCAV Depto de Zootecnia