The phrase "a time when horses" is correct and usable in written English.
It can be used when referring to a specific historical period or context involving horses, such as in discussions about transportation, agriculture, or culture.
Example: "In a time when horses were the primary mode of transportation, travel was a much slower and more arduous process."
Alternatives: "an era when horses" or "a period when horses".
Simms competed at a time when horse racing was dominated by black jockeys, who were the leading riders and often the highest-paid athletes of their day.
The board and the New York Racing Association have moved aggressively to reform their practices and punishments at a time when horse racing is under scrutiny for its use of illegal drugs, overuse of legal medications and lax oversight of its horsemen.
At a time when horse racing can use all the friends it can get as marketing partners to help promote the sport and strengthen its recently beleaguered public image, highly influential ones like the state's I Love NY campaign — widely acknowledged as one of the most recognizable brands in the world — are some of the best kind to have.
Because Fusaichi Pegasus is a runner as much as a looker, he has become one of the most-talked-about 3-year-olds in the nation at a time when horse enthusiasts talk about nothing but 3-year-olds: the run up to the first Saturday in May and the Kentucky Derby.
Although serious falls are less common in the competitive dressage arena, accidents can occur at any time, when horses slip or misbehave or when they are startled.
"Most of the time when horses come in from other countries and they're in quarantine for so long, they run good off the plane but then they've got to sit a long time and their next race might not be so strong.
New dates on animal fossils nail down for the first time when horses and mammoths disappeared in the far north--and show that the mammals did not die off all at once when prehistoric hunters arrived.
It was a time when hearses were drawn by horses and a simple funeral cost $28.70.
At a time when ordinary horses could be purchased for $15, non-Indians who had purchased Appaloosa horses from the Nez Perce turned down offers of as much as $600.
Rafalca was purchased and brought to the United States in 2006, at a time when dressage horses were fetching six- and seven-figure price tags.
