Óleo de soja em dietas para eqüinos atletas

Abstract

This work aimed to evaluate intake in athletic horses fed diets with soybean oil inclusion and the effects of apparent digestibility of nutrients, digestive kinetics, faeces characters and physiologic, hematological and biochemical parameters and. In first essay, fifteen horses were used in a completely randomized design with three diets and five repetitions. Diets used were: diet without soybean oil inclusion (control); diet with inclusion of 8.5% soybean oil; diet with inclusion of 19.5% soybean oil. Trial had 34 days of duration, 30 days to adaptation of diets and four days to samples collection. Kinetics of liquid phase of digesta was estimated by LIPE® (Isolated Lignin Purified Enriched) in liquid form. The LIPE® was given only one time by oral infusion in 30th day of essay and faeces samples were collected at 2, 4, 8, 12, 16, 20, 24, 30, 36, 42, 48, 54, 60, 66, 72 and 78 hours after. Faeces characteristics were evaluate on 33th and 34th day of essay. Blood samples were taken before and at 34th day. Data were submitted to variance analysis and means compared by Student Newman-Keuls test, at 5% of significance. In secund essay, twelve horses were used in a completely randomized design with two diets and six repetitions. Diets used were: diet without soybean oil inclusion (control); diet with inclusion of 10% soybean oil. The trial had 82 days of duration, with three physical effort tests before, at 60th and at 82th day of trial. Heart frequency and body temperature were evaluation and blood samples for analyze of hematological and biochemical parameters were taken in five moments in function of physical effort tests. The first data collection, before the test, with horses at rest, and immediately after the test, and 10, 20 and 120 minutes after the physical effort tests. Data were submitted to non parametric analysis, at 5% of significance. There was a significant reduction of dry matter intake in horses fed high fat diet. Apparent digestibility of fat increased in high fat diets (P<0.05) and apparent digestibility of cellulose decrease (P>0.05) in diet with 19.5% soybean oil inclusion. Apparent digestibility of others nutrients, except crude protein, digestive kinetics and faeces characteristics were not affecting (P>0.05) in horses fed diets with soybean oil inclusion. Horses fed high fat diet increased (P<0.05) in blood level of erythrocytes, hemoglobin and triglycerides and reduction of mean corpuscular volume. Soybean oil in diets did not affect physiological, hematological and biochemical parameters along the time intake time and in function physical effort tests. High fat diets were palatable and safety without any colic or diarrheas cases. The soybean oil can used in diet for horses, reducing dry matter intake and increasing energy density of diets that is interesting to athletic horses