The use of oxidized fats in swine feeding: The Breeding Herd

Adequate nutrition for both breeding sows and boars is essential to ensure health and reproductive performance in pig production. However, the increasing use of oxidized fats in breeding herd diets to reduce feed costs raises serious concerns due to its impact on reproduction and offspring quality.

During feed processing and storage, especially in lipid-rich ingredients, oxidation reactions can occur and generate toxic compounds that negatively affect reproductive tissues and metabolic function.

Oxidized Fats and Oxidative Stress in Sows

Oxidative stress in breeding sows is caused by excessive production of reactive oxygen species (ROS) and reduced endogenous antioxidant levels such as vitamin E, vitamin C, glutathione peroxidase (GPx), and superoxide dismutase (SOD).

Oxidized lipids increase lipid peroxidation in tissues, leading to the accumulation of oxidation products and damage to cell membranes. This directly affects:

• Estrous cycle regulation
• Abortion incidence
• Conception rate
• Oocyte quality

Impact on Sow Fertility

The oxidation of fats produces toxic compounds such as aldehydes and peroxides, which interfere with physiological and reproductive processes. Studies show a clear association between oxidized fat consumption and a decrease in conception rate in sows.

Several mechanisms explain this reduction in fertility:

• Hormonal imbalance affecting estradiol and progesterone production
• Reduced feed intake during lactation
• Poor body condition and lower egg viability
• Inflammatory responses affecting the reproductive tract

Effects on Lactation and Piglet Performance

Oxidized fats also reduce feed intake during lactation and increase backfat loss, negatively affecting milk quality and piglet growth performance. Piglets from these sows often show lower weaning weights and reduced early-life performance.

This creates long-term consequences for both sow productivity and offspring profitability.

Impact on Offspring Quality

Prenatal exposure to oxidized fats can affect fetal development and neonatal viability. Studies report:

• Altered gene expression and metabolic function in offspring
• Higher incidence of congenital malformations
• Lower birth weight
• Greater susceptibility to postnatal disease and metabolic disorders

Maternal nutrition directly influences offspring quality, making fat quality a critical factor for reproductive success.

Oxidized Fats in Boar Reproductive Health

Boars are also negatively affected by oxidized fats. Oxidative stress impairs cellular health and reproductive organ function, reducing:

• Sperm concentration
• Sperm motility
• Semen quality
• Testicular function

Fat oxidation also disrupts hormonal synthesis and affects the essential lipids required for sperm membrane integrity and normal reproductive function.

Implications for the Swine Industry

Oxidative stress caused by oxidized fats reduces both reproductive and productive efficiency across the swine industry. To minimize these risks, producers must pay close attention to:

• Fat quality used in diets
• Proper storage of raw materials
• Correct feed formulation for breeding animals
• Antioxidant supplementation strategies

Antioxidant supplementation is important not only to reduce feed oxidation, but also to control oxidative reactions caused by other production stressors.