9 out of 10 horses die

In 1877 (the year Black Beauty was published) a panzootic kills 90% of the world's horse population. How does society change?
 
Agricultural output falls big time. Enough to cause famine I don't know. Cattle and ox prices go up both due to a decrease in supply and the fact that they are now doing a lot of jobs formerly done by horses.
 
Though on the face of it a kill rate of 90% is highly improbable and I can see no realistic way that such a high death toll can be reached, let me give a boost to this thread by drawing attention (via cut&paste from wikipedia) to this OTL epidemic:

1872 American outbreak
An epizootic outbreak of equine influenza during 1872 in North America became known as "The Great Epizootic of 1872." The outbreak is known as the "most destructive recorded episode of equine influenza in history."[3] The impact of the outbreak is marked as one of the major contributors to the Panic of 1873 in the United States.
The first cases of disease in pasture horses were in the townships of Scarborough, York, and Markham in Ontario, Canada. By October 1, 1872, the first case occurred in Toronto. It took only three days before all the street car horses and major livery-stables were affected. By the middle of the month, Montreal, Detroit, and most of the Dominion of Canada and New England reported cases.[2]
By the start of November Ohio, Massachusetts, and South Carolina were reporting cases. So was Chicago, Illinois. The contagion reached Florida and Louisiana by the end of November and Cuba on December 7. The height of the plague was December 14, when the Mexican government had to supply disease-free horses to the stricken United States.[2] One major factor was that cities were not clean back in those days, which meant that germs spread all that much more quickly (especially through contaminated food and water).
The rate of infected horses approached 100%, and mortality rates ranged between 1% and 10%. Many horses were unable to stand in their stalls. Those that could stand coughed violently and were too weak to pull any loads or support riders.[4]
The street railway industry ground to a halt in late 1872. Every aspect of American transportation was affected. Locomotives came to a halt as coal could not be delivered to power them, while fires in many major cities raged unchecked. One fire in Boston destroyed over 700 buildings (November 9-10 of that year). Indeed, many a fireman just stood there helpless and horror-stricken, for lack of any equipment to work with. Even the United States Army Cavalry was reduced to fighting on foot against the Apaches (as the plague had swept not only south to Mexico and Cuba, but also west to the Pacific Ocean within two months!), who likewise found their mounts too sick to do battle. The outbreak forced men to pull wagons by hand; while trains and ships full of cargo sat unloaded (perishables, such as milk, often became spoiled), tram cars stood idle and deliveries of basic community essentials (including food and clothing) were no longer being made. The Long Riders' Guild Academic Foundation founder CuChullaine O'Reilly said, "The Great Epizootic was the worst equestrian catastrophe in the history of the United States - and perhaps the world."[4]
The Great Epizootic of 1872 was also a contributor to the Panic of 1873, which lasted six years; hence, it would be about seven years total before things were restored to normal operation.
 
I wanted the highest non-ASB death toll I could come up with. I estimated (WAG) that 90% was the borderline between non-ASB and ASB.
If the moderator disagrees, please either:
1) Post your estimate for highest plausible mortality, and then assume that THAT was the percentage, or
2) Move this thread to ASB.
 
Here are the top things that come to mine.

1) World economic panic until the economy adjusts to using something other than horses for the various jobs they used to do.

2) Railways, streetcars, and bicycles spread more quickly as does development of the automobile. Transportation and communication technology develop quickly as do related industries like oil.

3) Central Asia is devastated since it is more horse dependant than most areas. Farming settlers from Russia colonize the region more successfully than IOTL. Nomadic horse riders cease existing.

4) A prolonged peace in Europe until militaries adjust to the changes. Quicker adoption of mechanized warfare.

5) This likely slows down European colonial expansion as those societies spend more time dealing with local issues resulting from the horse plague.

6) In the short term, other animals pushed into the rule of horses whether they be oxes, camels, ostriches, or what have you.

Short term economic disruption that causes a lot of hardship. Long term faster technological growth and therefore economic growth. Eventually the surviving immune strain of horses will repopulate the horse population. By that time, most of the industrial world will have moved on since 1877 is near the same time as large scale capital formation, technological progress, and industrialism.
 
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