Suplementação de gordura de palma e lisolecitina inertes na dieta de cordeiras

Abstract

The objective was to evaluate the biochemical profile and performance of ropes fed with inert palm oil fat associated with lysolecithin, as well as the digestibility of the diets. For experiment 1, 28 crossbred lambs with 43.77 ± 5.45 kg of body weight (BW) and 8 ± 1 months of age were used, allocated in four collective pens for 41 days and subjected to a completely randomized design in a 2x2 factorial arrangement. The factors and levels considered were: 1) type of fat (TF; pure and with lysolecithin) and; 2) amount of fat (AF; 100 vs 150g), thus totaling four treatments. For experiment 2, 24 contemporary lambs of the same breed standard were used, weighing 37.33 ± 8.05 kg BW and 8 ± 1 months old, allocated in metabolism cages for 20 days, according to the experimental design described for experiment 1. The animals were fed corn silage and concentrates plus supplementation at 08:00 and 16:00. The analysis of variance of fixed effects and their levels (TF and AF) was carried out using SAS version 9.4 and initially the data were subjected to the normality and homogeneity test of variances at 5% probability. Significance was determined by the F and Tukey tests, when P≤0.05. Blood metabolites and body performance were assessed as repeated measurements over time, while the glycemic curve was statistically proven as a function of the time of assessment via linear regression. Body condition score (BCS) and fecal score (FE) data were analyzed using the Kruskall and Wallis test. There was an interaction between the factors (TF x AF) for the amount of feces in natural matter (FNM) and triglycerides (TRIG; P<0.05). The inclusion of lysolecithin affected FE when compared to pure fat (P=0.04). The addition of lysoleticin increased the BCS, as well as the levels of cholesterol (CHOL), TRIG and high-density lipoproteins (HDL) and very low-density lipoproteins (VLDL) when compared to pure fat (P<0.02). AF prevented the amount of FNM in relation to 100 g of fat (P=0.04). BW and barrel circumference (BC) increased linearly in relation to the day of evaluation (P<0.01). Average daily gain (ADG), weight gain (WG) and BCS had a quadratic effect for the day of evaluation. The variables creatinine (CREA), total proteins (TP) and urea and the ratios of total cholesterol and HDL (TC/HDL) and LDL/HDL showed a quadratic effect for the day of assessment. On the other hand, albumin (ALB) showed a positive linear effect (P<0.01) throughout the evaluation day. TRIG, CHOL, HDL, VLDL and low-density lipoprotein (LDL) increased (P<0.01) while fructosamine (FRUCT) decreased linearly in relation to the day of evaluation. Alkaline phosphatase (ALP) and aspartate amino transferase (AST) increased, while gamma glutamyltransferase (GGT) decreased linearly in relation to the day of evaluation (P<0.01). The supplements did not cause beneficial effects in the animals under the experimental conditions tested. The inclusion of lysolecithin associated with palm fat increased the serum concentration of blood metabolites, resulting in levels above the recommended level, without adverse effects on the animals.