Desempenho reprodutivo de varrões híbridos alimentados com rações suplementadas com óleo de soja como fonte de ácidos graxos

Abstract

One experiment was conducted at Animal Science Department of Lavras University (UFLA) in order to evaluate the reproductive and productive Performance of young hybrid boars fed with rations supplemented with soybean oil as a source of fatty acids. A total of 36 boars in growing phase from AGROCERES-PIC with averaging 47.3 kg were assigned to a randomized complete blocks with a three treatments (T1=control;T2=ration with 3.0% of soybean oil and T3=ration with 4.2% of soybean oil as a source of fatty acids, all rations were isoproteic and isoenergetic with twelve replications, being each animal used as a experimental unit. The following data were analyzed: average daily gain (ADG), average daily feed intake (ADFI) and feed conversion (FC), biometrics and histologics measurements of testis and hormonal profíle (testosterone and estratiol). At age of five months the pigs were trained for sêmen collection. During all experimental period were conducted four sêmen collection. During that time the sexual behavior traits were recorded in two períods. The seminal traits evaluated were: ejaculated volume, motility and spermatic vigor, spermatic concentration, total number of spermatozoa, percentage of live and dead spermatozoa, weight of gelatinous fraction, spermatic morphology, rate of osmotic resistance and thermo-resistence. The semen was submitted to cooler and frozen processing. In this experiment the pigs productive performance shown any significant (P>0.10) effect by treatments. The testicular biometrics parameters also were not influenced (P>0.10) by the treatments tested. It was observed significative effect of treatments (P<0.10) on the ejaculated volume, there was no significative difference (P>0.10) among treatments for spermatic concentration, total of spermatozoa, spermatic motility and vigor, percentage of live or dead spermatozoa and thermo-resistence (P>0.10). There was significative effect (P<0.10) of treatments on weight of gelatinous fraction, suggesting therefore higher activity of accessory glands. There was no significative difference (P>0.10) for morphologic alterations of spermatozoa among the treatments tested. The sexual behavior shown no significative differences (P>0.10) among the treatments. The rate of osmotic resistance of spermatozoa did not change among the treatments (P>0.10). The treatments also did not show any difference on, cooler and frozen spermatozoa processing as well as hormonal profile. In conclusion, the supplementation of soybean oil as source of fatty acid in ration of young hybrid boars did not improve his productive and reproductive performance.