Fifty 2- to 16- yr old pony stallions were randomly assigned to one of five treatments: Group 1, controls (no treatment); Group 2, mg/kg stanozolol weekly for 13 treatments; Group 3, mg/kg stanozolol every 3 wk for 5 treatments; Group 4, mg/kg boldenone undecylenate every 3 wk for 5 treatments; and Group 5, boldenone undecylenate weekly for 13 treatments. Mean plasma testosterone levels for Groups 2, 4, and 5 were elevated over controls (P<) at 2, 8, and 9 wk, respectively. Testosterone levels for ponies in Group 3 did not differ from controls (P>). There were no differences in mean plasma luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels among groups (P>). Daily spermatid production per gram of testicular parenchyma (DSP/gm) in Group 5 was lower than in controls (P<), whereas DSP/gm was not different among groups 1 to 4 (P>). There were no differences among groups (P>) in the percentage of Stage 8 tubules or relative number of Leydig cells. The mean diameter of Leydig cells was less for Group 5 than for controls (P<), but was not different for Groups 1 to 3 (P>).
Although I remarked it rarely but I will say what I personally think that Boldenon is the best choice for mass accumulation. Due to vascularity effect it is principally used for dry mass but if you use steroids that increase the appetite such as Boldenon, then it is hard to cope losing weight. The possibility of using Boldenon in combination with Testosterone Enathate or Cypionate for better effect inspires when compared to Nandrolone. Something like base. Less aromatizing than Nandrolone, not having the annoying progestogenic effect, meanwhile unbelievably increasing the appetite, which is reflected on the considerable weight addition at the end of course.
Anabolic steroids (ABS) boldenone (BL; mg/kg) and stanozolol (ST; mg/kg) were administered . to horses and the plasma samples collected up to 64 days. Anabolic steroids and androgenic steroids (ANS) in plasma were quantified using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The limit of detection of all analytes was 25 pg/mL. The median absorption (t1/2 partial differential) and elimination (t1/2e) half-lives for BL were h and h, respectively, and the area under the plasma concentration-time curve (AUCho) was /mL. The median t1/2e for ST was h and the was /mL. Peak mean (X+/-SD) plasma concentrations (Cmax) for BL and ST were and pg/mL, respectively. Quantifiable concentrations of ABS and ANS were found in % of the 988 plasma samples tested from race tracks. In % of the plasma samples two or more ABS or ANS were quantifiable. Testosterone (TES) concentrations mean (X+/-SE) in racing and nonracing intact males were +/- and +/- pg/mL, respectively. TES was not quantified in nonracing geldings and female horses, but was in racing females and geldings. Plasma concentrations of endogenous 19-nortestosterone (nandrolone; NA) from racing and nonracing males were +/- and +/- pg/mL, respectively.