The village of Sosnovoborskoye, founded in 1866, is the center of the eponymous district, which includes the villages and hamlets of Abodim, Bogatyrevka, Grigoryevka, and Gudoshnikovo. The village has a primary school, a kindergarten, a cultural center, a post office, a social rehabilitation center, and commercial enterprises. The ruins of the estate of landowner Ustinov and the stables of the former breeding farm 'Petrovsky' are considered historical monuments. For one and a half centuries, horse breeding has been one of the key activities of the local residents. In Tsarist Russia, this was associated with the Ustinov family, who settled in the Saratov province in the late 18th century. The founder of the family, Mikhail Adrianovich Ustinov, was a merchant who moved from Petersburg to Saratov in the 1780s and became a patron and public figure, for which he was granted nobility. His house in Saratov became a local history museum, and the estate in the village of Bekovo in the Penza region is one of the most beautiful. One of his sons, Vasily Mikhailovich, settled in the Petrovsky district and chose the village of Gryaznukha (now Sosnovoborskoye) as his ancestral home.

The estate was built in the center of the village among forests and fields. Vasily Ustinov chose this location for its picturesque pine groves and hills. Historians claim that the house had a library, but the main concern of the owner was the stables. At that time, cavalry played a key role in the army, and stables were considered temples of war, where horses were trained for battles and parades. There is an opinion that Vasily bred horses for personal needs but could not do without the solemnity in everyday life. Perhaps he showcased his racetrack to neighbors, as there were many estates in the vicinity of Petrovsk. Vasily Ustinov died young, at 42, and his estate was inherited by his son Mikhail. Over time, the estate fell into disrepair, as the descendants did not want to stay there. After the death of Mikhail Vasilyevich, the estate passed to his wife Maria, who lived in Moscow.

To this day, only two walls of the estate remain. Locals recall that the house was adorned with an observatory tower with stucco on the windows. The stables and riding arena have been preserved in better condition. The racetrack was square-shaped with a round building in the center. After the October Revolution, the buildings were not destroyed but used for their intended purpose. In 1921, the Gryaznushinsky horse breeding farm was established on their basis for breeding Orlov trotters, which combined beauty and endurance. The farm saved the breed from extinction after the wars. In 1930, the farm had 60 mares, and by 1940, 150. During the war, two factories were evacuated here, and the number of horses exceeded 600. The horses from the farm won the 'Bars' prize three times at the central Moscow racetrack. The 'Bars' prize is a prestigious competition for 4-year-old Orlov trotters.

Over half a century, more than four thousand pedigree Orlov trotters were raised and sold at the Gryaznushinsky horse breeding farm. The horses from the farm could be found all over Russia. In the 1960s, representatives from Mongolia and Czechoslovakia visited here. The director of the farm was N.A. Mikhalyev, who loved his work, which made the farm known throughout the country. In 1970, the farm took second place in the all-Union livestock breeding competition. On Agricultural Day, horse races were held, attracting residents from nearby villages. At the end of 2000, there were 208 pedigree horses at the farm, including 182 Orlov trotters.

In the early 21st century, the 'Petrovsky' horse breeding farm effectively ceased to exist: the stables became empty, and people sought other jobs. A decade later, the racetrack is still intact, and local residents hope for the revival of horse breeding.