Effects of fiber levels and protein sources on the synthesis of microbial nitrogen compounds in steers

Dutra, A.R.; Queiroz, A.C. De; Pereira, J.C.; Valadares Filho, S.D.C.; Thiebaut, J.T. Lima; Matos, F.N.; Ribeiro, C.V. D.M.

Revista Brasileira de Zootecnia 26(4): 797-805


ISSN/ISBN: 1516-3598
Accession: 008567462

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This experiment was carried out to study the effects of fiber levels (38.7 and 57.2% NDF) of diets composed of elephantgrass with sugarcane and two protein sources, a high (soybean meal) and a low (blood meal with corn meal) ruminal degradable protein, on ruminal synthesis and on the efficiency of bacterial nitrogen compound synthesis. Four Brown Swiss steers with fistulas in the rumen, abomasum, and ileum, and an initial average weight of 316 kg, were randomly allotted to a 4 times 4 latin square design. The steers were fed ad libitum diets containing two levels of fiber and two sources of protein with different ruminal degradable proteins. There were no effects of fiber levels and protein sources on ruminal synthesis and efficiency of synthesis of bacterial nitrogen compounds. Therefore, diets with the higher ruminant synthesis and efficiency of bacterial nitrogen compound synthesis were those with the higher fiber level, with average values of 42.87 g of bacterial nitrogen (N-BAC)/kg apparent total ruminally degradable carbohydrate (ATCRD), 53.40 g N-BAC/kg apparent ruminatly degradable organic matter (AOMRD), 0.67 g of bacterial dry matter (DM) (DMBAC)/g ATCRD, and 0.83 g of DM-BAC/g AOMRD, respectively.