Fracionamento e Cinética de Degradação In Vitro dos Compostos Nitrogenados da Extrusa de Bovinos a Pasto
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Fracionamento e Cinética de Degradação In Vitro dos Compostos Nitrogenados da Extrusa de Bovinos a Pasto. / Vieira, Ricardo Augusto Mendonça; Pereira, José Carlos; Malafaia, Pedro Antonio Muniz; De Queiroz, Augusto César; Gonçalves, André Luigi.
I: Revista Brasileira de Zootecnia, Bind 29, Nr. 3, 05.2000, s. 880-888.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Fracionamento e Cinética de Degradação In Vitro dos Compostos Nitrogenados da Extrusa de Bovinos a Pasto
AU - Vieira, Ricardo Augusto Mendonça
AU - Pereira, José Carlos
AU - Malafaia, Pedro Antonio Muniz
AU - De Queiroz, Augusto César
AU - Gonçalves, André Luigi
PY - 2000/5
Y1 - 2000/5
N2 - The objective of the present study was to determinate the nitrogenous compounds fractions present in the extrusa of grazing cattle maintained in a natural grassland in the Zona da Mata region, MG. The samples were obtained by using four esophageal fistulated steers in two experimental periods during the rainy season of 1996, and three of these animals were used to take samples in two experimental periods during the dry season of the same year. In order to obtain the nitrogen fractionation (fractions A, B1, B2, B3 e C), the crude protein (CP), non-protein nitrogen (NPN), borate-phosphate buffer insoluble nitrogen, and neutral detergent and acid detergent insoluble nitrogen were determined. The in vitro degradation profiles of the protein fractions were obtained by incubating the pasture samples with Streptomyces griseus proteases. With these techniques it was possible to detect reductions in the CP content and in the percentage (% CP) of B3 fraction and increases in the percentages of the A, B1 and C fractions from EC to ES; no differences were found for the percentage of the fraction B2 between seasons. The degradation rates of fractions B2 and B3 were extremely variable: its average estimates were 2.427 and 0.057 h-1, respectively, during the rainy season, and 2.149 and 0.034 h-1 , during the dry season.
AB - The objective of the present study was to determinate the nitrogenous compounds fractions present in the extrusa of grazing cattle maintained in a natural grassland in the Zona da Mata region, MG. The samples were obtained by using four esophageal fistulated steers in two experimental periods during the rainy season of 1996, and three of these animals were used to take samples in two experimental periods during the dry season of the same year. In order to obtain the nitrogen fractionation (fractions A, B1, B2, B3 e C), the crude protein (CP), non-protein nitrogen (NPN), borate-phosphate buffer insoluble nitrogen, and neutral detergent and acid detergent insoluble nitrogen were determined. The in vitro degradation profiles of the protein fractions were obtained by incubating the pasture samples with Streptomyces griseus proteases. With these techniques it was possible to detect reductions in the CP content and in the percentage (% CP) of B3 fraction and increases in the percentages of the A, B1 and C fractions from EC to ES; no differences were found for the percentage of the fraction B2 between seasons. The degradation rates of fractions B2 and B3 were extremely variable: its average estimates were 2.427 and 0.057 h-1, respectively, during the rainy season, and 2.149 and 0.034 h-1 , during the dry season.
KW - Nitrogenous compounds
KW - Ruminants
KW - Tropical pastures
UR - http://www.scopus.com/inward/record.url?scp=0347698533&partnerID=8YFLogxK
M3 - Tidsskriftartikel
AN - SCOPUS:0347698533
VL - 29
SP - 880
EP - 888
JO - Revista Brasileira de Zootecnia
JF - Revista Brasileira de Zootecnia
SN - 1516-3598
IS - 3
ER -
ID: 271557764