%0 Journal Article
%T Evaluation of mannan-oligosaccharides offered in milk replacers or calf starters and their effect on performance and rumen development of dairy calves
%A Silva
%A Jackeline Tha¨ªs da
%A Bittar
%A Carla Maris Machado
%A Ferreira
%A Lucas Silveira
%J Revista Brasileira de Zootecnia
%D 2012
%I Sociedade Brasileira de Zootecnia
%R 10.1590/S1516-35982012000300038
%X the objective of this study was to evaluate the route of administration of mannan-oligosaccharides in the diet of dairy calves and their effects on performance and plasma parameters indicative of rumen development. following birth, twenty-four male holstein calves were used in a completely randomized design and assigned to the following treatments: control; 4 g/d bio-mos£¿ (alltech biotech.) added to starter concentrate; and 4 g/d bio-mos£¿ mixed into milk replacer. animals were housed in individual hutches with free access to water, and fed 4l/d of milk replacer until weaning at six weeks. calves also received 23g/kg crude protein of starter concentrate ad libitum. fecal scores were evaluated daily. body weights, growth measurements and blood samples for glucose, urea-n and ¦Â-hidroxibutyrate analyses were taken weekly until 8 weeks of age. there were no significant effects of treatment or treatment ¡Á age interactions for mean starter concentrate intake, weight gain or body growth. however, there was a significant age effect for all parameters. fecal scores were not affected by treatments. also, plasma concentration of glucose, urea-n or ¦Â-hidroxibutyrate were not affected by treatment or the treatment ¡Á age interaction. however, urea-n and ¦Â-hidroxibutyrate concentrations significantly increased with age, suggesting adequate rumen development. under the conditions of this study, there were no calf performance benefits when mannan-oligosaccharides were incorporated into milk replacer or calf starter concentrate.
%K additives
%K blood parameters
%K early weaning
%K fecal score.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-35982012000300038&lng=en&nrm=iso&tlng=en