Wild horse and burro program in Fiscal Year 2018.
Nationwide population estimates: 88,090
Total removed: 11,472
Total placed into private care: 4,609
Total trained: 1,479
Total fertility control treatments: 702
Total expenditures: $81.226 million
The current estimated on-range wild horse and burro population (as of March 1, 2019) is 87,885, a 7.25 percent increase over the 2018 estimate of 81,951...That means the current West-wide on-range population exceeds AML by more than 61,000.
[Note: 61,000 surplus, and 4,600 placed into private care, plus 702 given fertility control treatment. Sounds like the surplus GREATLY exceeds the demand. BTW - 3,158 adoptions. The other 1,451 were sales "to any willing buyers animals that are either more than 10 years old or have been passed over for adoption at least three times."]
The currently available fertility control vaccine, known as porcine zona pellucida (PZP), is limited in the duration of its effectiveness – a one-year formulation (initially assumed to be 22 months) that must be hand-injected into a captured wild horse. A second formulation of PZP can be deployed via ground-darting, but is also effective for up to only one year. This dart-deployed formulation is not a viable fertility-control option for most wild horse herds because of (1) the animals’ propensity to avoid human contact and (2) the vast sizes of most herd ranges, which make it difficult to locate and track individual horses....
These off-range horses [Note: 48,375 ] and burros are fed and cared for in either off-range corrals or pastures at a cost of nearly $50 million a year...The total capacity of all BLM off-range holding facilities is 56,581 animals.... https://www.blm.gov/programs/wild-ho...m/program-data