The USDA Economics, Statistics and Marketing Information System keeps tabs on animal exports on a daily basis. Since it is close to the end of the year, we wanted to check on the number of horses going across the border from the United States to Mexico for slaughter and other purposes. Below are the statistics through December 6, 2018.
As you can see, there has been an increase in the number of horses declared as exported for slaughter from the United States to Mexico in 2018 compared to 2017 just in this one report (which does not include Canada exports for slaughter).
Below is the same report for horses exported just from Texas. Note that these numbers are included in the U.S. exports to Mexico document above are are not in addition to those.
Whether you are pro-slaughter or anti-slaughter in the United States, these numbers show that tens of thousands of U.S. horses are being shipped sometimes thousands of miles per trip to Mexico for slaughter. Again, these numbers do not include U.S. exports to Canada.