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The effects of cassava wastewater on nutrient digestibility and rumen protozoa were evaluated in 32 Santa Inês sheep fed a diet with Tifton hay, ground corn cob, and concentrate, containing 0, 500, 1000, or 1500 mL cassava wastewater. Uncastrated sheep at an average age of 167 days and average weight of 25.3 kg were housed in individual stalls and distributed in a randomized complete design with four treatments and eight replicates. The experimental period was 70 days: 15 days for adaptation to the diets and 60 days to collect the ingredients and diets supplied. Prior to this stage, the animals were adapted to the consumption of cassava wastewater, in collective cages, for seven days. Apparent digestibility was determined by partial feces collection and by using the LIPE external marker in 250-mg capsules. The apparent digestibility of nutrients did not differ (P>0.05) in relation to the cassava wastewater levels tested. Eleven genera of rumen protozoa were identified, and they formed a community that, except for Ophryoscolex, did not differ among the cassava wastewater treatments with respect to composition. However, Entodinium species were observed at a higher density (P<0.05) in sheep that received 1500 mL of cassava wastewater. The use of cassava wastewater in the sheep diet does not affect the digestibility of nutrients or composition of rumen protozoa; however, it causes a significant increase in Entodinium density.

Apparent digestibility and rumen protozoal profile of sheep fed cassava wastewater