Metabolismo nitrogenado de novilhas Jersey alimentadas com quitosana ou grão de soja cru nas dietas

Abstract

The objective was to evaluate the microbial protein synthesis, nitrogen balance and clearance nitrogen compounds of Jersey heifers fed with chitosan or soybeans in the diets. We used eight heifers of Jersey breed, aged 6 ± 0.5 months, with an average weight of 139.50 ± 25.56 kg. The animals were randomly divided into two 4x4 Latin squares, balanced and contemporary, in 2x2 factorial arrangements. The animals were randomly divided into two 4x4 Latin squares, balanced and contemporary, in 2x2 factorial arrangement. The experimental period was 20 days and 14 for the adaptation of experimental diets and 6 for data collection. The experimental diets were: 1. Control (CONT); 2 - Chitosan (QUIT) (including 2 g / kgDM); 3 – Whole raw soybean (GS) (7.2% EE); 4 - CHIGS (including chitosan + Whole raw soybean). The experimental diets were formulated according to NRC 2001 aiming weight gain of 700 grams per day, and isonitrogenous. Diet had a ratio of 50% forage and 50% concentrate. The roughage used was corn silage. The synthesis of nitrogen and crude protein synthesis were reduced by CHI diet. The CHI + GS diet reduced nitrogen excretion in the urine. The GS diet reduced the clearance of urea, CHI diet reduced creatinine clearance while the GS diet increased creatinine clearance. The combination of chitosan and soybean positively influenced the protein metabolism of Jersey heifers.