The STUD Breeding Protocol



This is simply the breeding protocol we follow at The Stud that has allowed us to have the most success when breeding both sows and gilts. We wish our clients the best of luck settling females for World Pork Expo, Summer Spectacular and soon, Midwest State Fair litters!


The Stud utilizes MATRIX (altrenogest), a synthetic progestagen, used to synchronize estrus and allow for better heat detection. Feed the recommended dosage of MATRIX for 16 to 18 days to ensure optimal hormone levels are reached and stabilized.  Most females will cycle within 3-7 days with vast majority standing at day 4, 5 and 6 post pulling MATRIX.  We do not give PG600 after stopping MATRIX, but others have seen great success.  We do, however, administer PG600 to all sows at weaning if we plan to breed on the first cycle out of the crate.


Check heat twice per day by running a teaser boar in front of sow pens each day during breeding season to learn behavioral tendencies of the females.  On days 3-5 post-MATRIX, turn a teaser boar in with the sows to better stimulate estrus.  If a gilt, breed 12 hours after standing heat is observed and then breed again with a 2nd dose 12 hours later.  For sows, wait 24 hours for the first dose and then breed again in 12 hours.  The STUD recommends giving all sows 2-3 cc Cystorellin immediately after completing the second dose.  If semen is available and if female is still standing 24 hours after 2nd dose was used, then it is suggested to breed again.


  • BE PATIENT – Semen is viable for approximately 24 hours in the female, however, both sows and gilts ovulate towards end of the cycle so typically the last dose is the most important.
  • It normally takes about 5 minutes per sow to click here breed and around 10 for gilts.  Be patient and do not force semen, rather apply gentle pressure to the bottle.
  • *The single most important thing you can do is invest in a teaser boar. They are extremely valuable in increasing success rates.


  1. Upon receiving, immediately unpack and gently place in a semen cooler or wine cooler.
  2. Be aware of where and what time UPS will be delivering. Try to instruct the carrier to be cautious of direct sun and to keep out of the elements.
  3. We do not rotate the semen for 2 reasons – 1.) Doing so may damage semen 2.) Rotating requires time and handling in room temperature environments. In the process, fluctuation in temperatures may occur causing damage to the semen.
  4. If breeding multiple sows, keep semen temperature maintained best you can in an insulated container/pack or take out only semen to use on the sow(s) you know you are ready to breed.
  5. *The second most important item for successful breeders is a semen cooler (preferred) or wine cooler set at 62-64 degrees F or 16-18 degrees C. Remember,  consistency is the most important.
  6. If scoping the semen, do so prior to use, not afterwards. Let the semen warm for a few minutes before placing under the microscope.
  7. Note, The Stud mixes semen at 5-6 billion live sperm cells.
  8. DO NOT shake, drop or throw semen.  This may be as hard on the quality as variation in temperature.