Consumo e digestibilidade do feno de Brachiariia brizantha cv. MG4 por bovinos suplementados com diferentes niveis de uréia / Intake and digestibility of Brachiaria brizantha cv. MG4 hay for bovine supplemented with different levels of urea

AUTOR(ES)

Cynthia Silveira Lescreck Gomes

DATA DE PUBLICAÇÃO

2007

RESUMO

The intake and apparent digestibility of dry matter (DM), organic matter (OM), neutral detergent fiber (NDF), crude protein (CP), non fiber carbohydrate (NCF), eter extract (EE)) and total digestible nutrients (TND) of the low quality Brachiaria brizantha cv. MG4 hay were evaluated on presence of increasing urea levels. Where used five Nellore steers, male, castred, with average weight of 420 kg, canuled. The animals had receive water and minerals mix ad libitum and the basic food was made of brachiaria hay with CP level next to 3%. The treatment were: only hay for to control (PO) and increasing levels of urea added directly in the rumen aiming to develop in 2% (P2), 4% (P4), 6% (P6) and 8% (P8) the dietetic protein level of the diet. The experimental delineation used was the latin square, with five treatments and five experimental periods. The data were analyzed using the program SSAG (System of Statistic and Genetic Analysis). Linear increases in the consumptions of DM, OM and NDF were observed when the level protein was raised from 3,4% to 9,9% in the diet and reduction in the same ones when the level of protein was 11,6%. Significant differences weren t observed for the consumption of NCF and EE. The addiction of urea increasing level didn t provoked effects under the digestibilities of DM, OM, NDF and NCF in all treatments and the digestibility of CP shown quadratic effect. It is concluded that the nitrogen has priority importance for the raise of ruminals microorganisms, resulting the increase of consumption and the deficiency of energy seemed to be the limiting effect, doesn t having effect in the digestibilities. It is concluded that the nitrogen has priority importance for the ruminal environment and it is suggested the supplementation the voluminous s CP with urea until the level of 10% to fed bovines with low quality roughage.

ASSUNTO(S)

bovino digestibilidade hay bovine urea feno braquiária uréia digestibility nutricao e alimentacao animal

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