Are Feed Molds and Mycotoxins Affecting Your Herd's Performance?

Many producers report feed mold and mycotoxin problems in mid to late summer. We don't know if the occurrence of mold is on the rise, or if we are more aware of the problem because of better record keeping and better tracking of herd performance. Some producers believe that today’s corn has become less resistant to mold. One thing is certain, If the corn has been "stressed" molds are more likely to appear. Regardless of the cause, summer and fall are peak seasons for mycotoxins. Molds need moisture and warmth to grow.

The herd performance factors that will be affected by molds and mycotoxins will be lower feed intake, slower growth rate and lowered immunity. Obviously, early detection and problem resolution is very important. Look for these warning signs in your herd:

• Swollen vulvas in young gilts
• Pseudopregnancies, early abortions and anestrus
• Lowered fertility
• Prolapses of the rectum or vagina
• Feed refusal
• Vomiting
• Pigs are restless, aggressive and may tailbite.

Periodically check bins, feed lines, feeders and when clinical signs occur, have your grain checked for mycotoxins rather than just a mold test. A good lab for testing is:

NDSU VETERINARY LABORATORY
BOX 5406
FARGO, ND 58105
PHONE: 701-231-8307

If you suspect mold may be a problem, consider using a mold inhibitor during storage. Some producers routinely use some type of additive in feeds as a preventative. Some products are better at inhibiting mold growth and others at binding toxins already there. Good results have been achieved with finely ground bentonite at 5 – 10 pounds per ton. Bentonite will also help stop the clinical symptoms that may already be shown in pigs. In extreme cases, the grain may be too contaminated and another source of grain must be found.

Remember that with molds and mycotoxins, as well as many other challenges facing today’s producers, there is no substitute for good observation techniques to minimize their negative effects on your herd’s performance.