Hyperprolific sows require different management, and come with different benefits and consequences than less prolific sows. Country effects are management or herd features that occur due to a country’s cultural impact on production. France and Denmark are two countries with hyperprolific sows, and a country effect in both is the use of prostaglandins to induce farrowing. In France, prostaglandins are widely used, but in Denmark they are banned. Hyperprolific herds may have litter sizes that exceed functional teats on the sows, so sow selection has been used to increase the percent of sows with 16 teats. Management tactics have to be changed with hyperprolific sows to manage increased preweaning mortality and overcrowding issues. As well, as litter size increases the number of piglets with low birth weight (<1kg) will increase. However, mortality may not be entirely dependent on birth weight, but may involve maturity and vitality also. Feeding management of hyperprolific sows is another aspect for producers to consider. Overfeeding through gestation appears to have no consistent effect, and overfeeding during the last week before farrowing seems to show a positive effect. Batch farrowing is a management strategy that can be used, and is used in France. Altrenogest can be used to synchronize ovulation in a batch, and prostaglandins can be used to synchronize farrowing in batches. One consequence of hyperprolific sows is the increased use of cross-fostering, which can be overused and lead to wide variation in piglets origins in each litter. Hyperprolificy can increase profits, but at this point it is probably wise to focus on other herd aspects including reducing preweaning mortality.