A friend of mine dug this up. The active ingredient is cottonseed oil, but it isn't cottonseed oil that causes infertility, but gossypol that is in cottonseed oil.
Contraceptive bait for feral hogs. Reduces the fertility of male feral hogs within 5 days.
Maintains fertility interruption for at least 30 days after 5 feedings. Results may vary.
Contains only nontoxic ingredients. Contains all natural ingredients.
For use to control feral hogs (Sus scrofa) on pastures, rangeland, forests, and non-crop areas.
Suitable for use in areas adjacent to crop rows and growing areas.
This part did not copy from the pdf, but appears to be the filler material for making the feed. PM with an email and I will send you the pdf
IngredientsActive ingredients: cottonseed oil (1.0%)
. Inert ingredients (99.0%): sodium chloride, corn, cottonseed meal, molasses.
It is a violation of federal and state law to use this product in a manner inconsistent with its labeling. This product should only be used to control the reproduction of feral hogs. This bait should only be applied in hog feeders equipped with heavy lids (minimum of 17 lbs. total lid weight) on bait compartments to limit access by non-target animals. Locate hog feeders in or near probable resting areas for hogs as indicated by sightings, soil rooting, hog wallows, and fresh hog tracks and scat. Secure feeders in place to prevent hogs tipping them over. Ensure that there are sufficient feeders to address the hog population. Ensure that sufficient bait is available in each feeder. If moldy or spoiled bait is apparent, remove immediately and replace with fresh bait. When feeder is emptied by hogs, clean feeder of old bait residue before refilling. Collect and dispose of spilled bait properly.
Conditioning the hogs to feeders:
Bait application: Add 50+ pounds of HOGSTOP® to each feeder and close lids. Monitor feeders every 2 to 4 days after loading to determine whether hogs are accessing the bait and replenish bait as necessary. Store product in unopened bag in a cool, dry place inaccessible to children, pets, domestic animals, and other wildlife. Dispose of unused product properly.
CAUTION: May be harmful if swallowed. Dust may cause eye and respiratory irritation. Wear gloves when handling. FIRST AID: If swallowed, drink plenty of water. Do not induce vomiting. If in eyes, rinse thoroughly
with clean water. If on hands or clothing, wash thoroughly. Call a physician if discomfort occurs. KEEP OUT OF REACH OF CHILDREN.
This product has not been registered by the US Environmental Protection Agency. Corona Feed Additives, LLC represents that this product qualifies for exemption from registration under the Federal Insecticide, Fungicide, and Rodenticide Act.
HOGSTOP is a registered trademark of Corona Feed Additives, LLC of NM.
Copyright 2021 Corona Feed Additives, LLC. US Patent Pending
Corona Feed Additives, LLC
623 CR 497
Dublin, Texas 76446
50 lbs (22.68 KG) NET WEIGHT
So the active ingredient is "cottonseed oil" which is freaking vague. What they are talking about is gossypol in the cottonseed oil.
It would seem that gossypol can have negative impacts on cattle, but in females, not males. https://dairy-cattle.extension.org/...-a-performance-concern-for-dairy-cattle/
Maybe not so much on fertility, but on embryo development...https://www.researchgate.net/public...seed_products_on_reproduction_of_mammals
However, the folks at the University of Florida note that cottonseed CAN reduce the fertility of bulls...https://edis.ifas.ufl.edu/publication/an130So this would be a LIE that this is only harmful to monograstric animal fertility.
All of this is outside of my biological background. Maybe somebody here can shed light on the possible problems of gossypol on farm animals or wildlife.
According to my friend, what she was told is that boars need five good feedings (1 per day) to drop sperm count and then maintenance feeding to keep it suppressed. There is no such thing as a boar-specific feeder, so you are going to have to use hog-specific feeders so at least half of your HogStop is going to be eaten by sows from your hog-specific feeders. My friend could not get an estimate on the cost of the feeders but was quoted a price of $600-650 per ton for HogStop, which comes out to $15-16.25 a bag but will probably include a by bag upcharge for the bag, labor etc. in bagging.