Investigation of Blood Parameters and Thyroid Hormones of Romanov-Moghani Crossbred Lambs as the Effect of Boldenone Undecylenate and Dietary Protein Level

Inroduction & Boldenone undecylenate is an anabolic steroid that stimulates protein retention, decreases nutrient requirement and increases feed efficiency. On the other hand, higher levels of dietary protein increases protein and amino acid availability in the body. Cross-breeding the fat tailed Moghani sheep breed with free tailed Romanov breed resulted in fat tail removal, lower fat deposition and higher protein retention. Therefore, the aim of this study was to investigate the effects of boldenone undecylenate and dietary protein level on blood parameters and thyroid hormones of Romanov-Moghani crossbred lambs.
Material and Twenty Romanov-Moghani crossbred male lambs were used in a randomized completely design with 2×2 factorial arrangement of treatments. The experiment lasted 75 days. The main experimental effects were effect of boldenone injection (no injection or injection of 0.5 mg/BW) and effect of diet protein level (12 or 16 percent per DM). Blood sampling were taken monthly from cervical vein in two stages from all lambs about 3 hours after feeding.
The results showed that blood urea nitrogen concentration (BUN) was influenced by hormone injection during the first month (hormone injection) and injection of hormone caused a significant decrease in BUN levels (P 0.05).
In general, it can be concluded that administration of boldenone undecylenate and dietary protein level change the protein metabolism in the Romanov-Moghani crossbred lambs and therefore the storage of fat decreases and more energy in tissues is used for synthesis and storage of protein and eventually increase muscle mass.