Periódicos Brasileiros em Medicina Veterinária e Zootecnia

p. 01-06

Alterações na população de protozoários ruminais, quantificados a partir da adaptação da técnica de Dehority, de ovinos submetidos a uma dieta de confinamento

Erpen Lima, MárcioVendramin, LúcioAndré Chaves Hoffmann, DustinPaixão Lisboa, FernandoGallina, TiagoRohrig Rabassa, VivianeSchwegler, ElizabethNunes Corrêa, Marcio

Background: The search for productivity increase in finish ruminants is related with the intensification of production. The use of concentrated feed in finish lambs can determine a profitable product and quality, wich reachs ideal weight in a short time. However, the addition of concentrated feed can cause a shift in the whole rumen ecosystem, and as a result, having animals more susceptible to metabolic disorders. As protozoa have their growth stimulated or inhibited by dietary factors, it becomes important to quantify and evaluate its activity in response to diets for ruminants. Thus, using measurements of the number of protozoa in the rumen fluid, we are able to make early diagnosis of possible metabolic disorders, as well as adjustments in ration formulations. The objective of this study was to evaluate the concentration and activity of protozoa in rumen of sheep in a feedlot diet, and validate an adaptation of the technique Dehority for counting of protozoa in the rumen fluid. Materials, Methods & Results: It were utilized 5 crossbred Texel x Corriedale ewes not pregnant, not lactating, with approximately 18 months old and with average weight of 50.73 ± 4.38 kg. The females were kept confined, receiving water and ration ad libitum in individual feeders. Ewes were fed twice (8:30 and 16:30) daily with a diet aiming to provide the DM intake equivalent to 3.5% of body wei

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