Ruminal degradability and ciliates protozoa population in rumen of Nellore steers fed with high concentrated diet supplemented with live yeast, monensin and salinomycin

Abstract

Four Nelore steers had been used, with average alive weight of 190±32 kg, in experimental delineation by 4x4 latin square, whith the objective of evaluate the effect of the yeast monensin and salinomycin on the parameters of ruminal degradability and the ciliates protozoa population present in the animals rumen. The diet offered to the animals was composed by sorghum silage and concentrated (30:70, respectively), where the four different treatments had been submitted in accordance with the used additive: 5,0g of yeast culture (Beef Sacc®); 0.42g of salinomycin (Coxistac®); 2.0g of monensin (Rumensin®) and the control, without additive. The experimental period was subdivided in 21 days of adaptation and seven of harvest, totalized 28 days of experimental period. It had increase of the value for fraction “b” in the dry matter, the treatment with yeast culture, and the salinomycin treatment (P<0,05). The treatment with yeast significantly increased the number of rumen ciliates protozoa (P<0,05).

Keywords

• aditivos
• degradação
• ionóforos
• protozoários ciliados
• Sacharomyces cerevisiae