Digestability of rations fed measured with animals kept housed and in confinement

Authors

  • Gilberto Braun Instituto de Zootecnia, Seção de Avaliação de Forragens, Nova Odessa, SP
  • Celso Boin Universidade de São Paulo, ESALQ, Departamento de Zootecnia de Ruminantes, Piracicaba, SP
  • Rosana Aparecida Possenti Instituto de Zootecnia, Seção de Avaliação de Forragens, Nova Odessa, SP
  • João José Assumpção de Abreu Demarchi Instituto de Zootecnia, Seção de Criação e manejo de gado de leite, Nova Odessa, SP
  • Márcio Antonio Gomes Ramos Instituto de Zootecnia, Seção de Nutrição de Plantas Forrageiras, Nova Odessa, SP

Keywords:

chromic oxide, digestibility, intake levels and marker

Abstract

To evaluate the utilization of chromic oxide to estimate the digestibility of rations it was fed to Zebu bulls in metabolism crates or in pens. The ration had 60% silage (corn or sorghum) and 40% concentrate, and 12% CP, and were fed at three intake levels: A - "ad libitum", B - 70g and C - 51G/kg LW0,75. Each animal received 10g of technicak grade chromic oxide per day. The recuperation of the chromic oxide from the metabolism crates (10 observations for treatments A and C, and 13 for treatment B) was utilized to calculate the total of faeces of the animals kept in pens (15 observations for treatments A and C, and 18 for treatment B) and was low and not effect by intake level (60.8; 67.7 and 57+1%, respectively for A, B and C; p > 0.05 and VC% - 16.5). The mean DM intake for animals in pens was 86.7; 71.3 and 57.2g DM/kg LW0,75 (VC% = 14.7). The DM digestability calculated the mean recuperation of chromic oxide was 57.1; 60.5 and 62.6%, respectively for A, B and C (VC% = 17.7). The quadratic effect was significant (p < 0.05) and the DM coefficients of digestibility estimate with chromic oxide were lower than those determined through total faeces collection (60.1 vs 67.5%; p < 0.05).

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Published

2014-01-14

Issue

Section

ANIMAL NUTRITION

How to Cite

Digestability of rations fed measured with animals kept housed and in confinement. (2014). Bulletin of Animal Husbandry, 53, 17-22. http://bia.iz.sp.gov.br/index.php/bia/article/view/986

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