Nice colors, cow, and composition. But the cow looks to be in motion, which leads me to believe that you didn't use multiple exposures for HDR, just color saturation and contrast.
Saturation is a bit too bright for my tastes, and I am loosing a tiny bit of detail in the face, however this has great composition and contrast, and is a very great capture of an intreguing subject.
This is a nicely done and colored photo that meets the challenge description, however I dont find much pop or wow, or interest in the photo. I voted it a 6 for meeting the challenge and the coloring. Good luck.
Though you've brought out detail in the bull's face, I feel that the colours appear a little unnatural, especially the yellows. FWIW, yellows and reds are the hardest colours to get right as they block up so easily.
Wow! GREAT JOB! I'm not an expert on HDR, but this seems to me like a flawless representation of the light, colors and shadows range! Plus. . .I love cows! :)