%0 Journal Article
%T Taxas de passagem e cin¨¦tica da degrada£¿£¿o ruminal em bezerros holandeses alimentados com dietas contendo diferentes n¨ªveis de concentrado
%A B¨¹rger
%A Peter Johann
%A Pereira
%A Jos¨¦ Carlos
%A Coelho da Silva
%A Jos¨¦ Fernando
%A Valadares Filho
%A Sebasti£¿o de Campos
%A Cecon
%A Paulo Roberto
%A Jord£¿o
%A Cl¨¢udio Pereira
%A Braz
%A S¨¦rgio Pereira
%J Revista Brasileira de Zootecnia
%D 2000
%I Sociedade Brasileira de Zootecnia
%R 10.1590/S1516-35982000000100030
%X abstract - this work was conducted to evaluate the effects of different concentrate levels on the liquid passage rates, using co-edta, and particulate, using ytterbium chloride and cr-mordant, and the in situ ruminal degradation kinetics of dry matter (dm) and crude protein (cp). five rumen and abomasum fistulated bull holstein calves, with an initial average age of 5.8¡À0.7 months and initial average of 107.4¡À11.0 kg lw were allotted to a 5x5 latin square design (treatment x period). the animals were housed in individual stalls and full fed diets (dm basis) containing 30.0, 45.0, 60.0, 75,0 and 90.0% of concentrate. the diets were based on coast-cross grass hay as forage and soybean meal an corn ground grain in the concentrate. the passage rate of fluids showed a quadratic behavior, with the maximum value of 9.73%/h, with the 61.69% of concentrate in the diet. the particulate passage rate of the soybean meal in the reticulum-rumen linearly decreased, while the concentrate levels in the diets did not affect the passage rate in proximal cecum-colon. the concentrate levels in the diet did not affect the passage rates of the coast-cross grass hay in the reticulum-rumen and in the proximal cecum-colon. the effective degradation of the dm of the soybean meal was not affected, while those of the corn ground grain increased and coast-cross grass hay linearly decreased, respectively. the effective degradation of the cp of the soybean meal and coast-cross grass hay did not vary, however, that of the corn ground grain linearly increased as the dietary concentrate levels increased.
%K holstein calves
%K ruminal degradation
%K concentrate levels
%K passage rate.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-35982000000100030&lng=en&nrm=iso&tlng=en