Sow colostrum and its strategic impact on piglet survival and growth

Marianna Altieri – Research and Development, Carra Mangimi S.p.A.
Giuseppe Carcò – Formulation Assistant, Carra Mangimi S.p.A.

Colostrum is the first secretion produced by the sow’s mammary gland during the first 24 hours after farrowing. Often referred to as “liquid gold”, it provides immunoglobulins, bioactive peptides, growth factors, highly assimilable nutrients, and prebiotic and probiotic components that support the piglet’s transition to extrauterine life.

Why colostrum is essential for piglets

Because the porcine placenta is epitheliochorial, antibody macromolecules cannot be transferred during gestation. Consequently, timely colostrum intake is the only route for maternally derived antibody transfer and passive immunity in newborn piglets.

Effective colostrum intake is directly associated with neonatal survival, piglet vigor, and long-term zootechnical performance. However, hyper-prolific genetics have created new challenges, including larger litters, lower average birth weights, and greater birth-weight heterogeneity.

Nutritional and immunological composition

From a nutritional standpoint, porcine colostrum contains approximately 16.5% protein. These proteins consist mainly of caseins and whey proteins, with immunoglobulins representing more than 80% of the whey fraction.

Regarding the immunoglobulin profile, IgG is the most abundant, followed by IgA and IgM. While IgG and IgM are derived from maternal serum, approximately 60% of IgA is synthesized locally in the mammary gland through the gut-mammary axis.

Rapid changes after farrowing

The biochemical composition of colostrum changes rapidly after parturition. Initially, it contains relatively low concentrations of fat and lactose, but within 24 hours, protein levels decrease while fat and lactose concentrations increase as secretion transitions toward mature milk.

Bioactive compounds and antimicrobial defence

Beyond basic nutrition, sow colostrum contains bioactive molecules such as nucleotides, oligosaccharides, peptides, organic acids, and antimicrobial factors.

• Lactoferrin helps inhibit pathogen proliferation by sequestering iron.
• Lactoperoxidase produces intermediates toxic to bacteria.
• Lysozyme degrades bacterial cell wall peptidoglycan.

Growth factors and intestinal development

Colostrum supports intestinal epithelial proliferation and maturation through growth factors such as IGF-I, IGF-II, TGF-β1, TGF-β2, and EGF.

Insufficient colostrum intake can lead to severe intestinal lesions and diarrhea, compromising absorptive capacity and long-term performance. Low-intake piglets have also been shown to present lower ileum and colon size and reduced weaning weight.

Taurine and metabolic support

Among colostrum metabolites, taurine plays a significant role in piglet survival and weight gain. It supports central nervous system development, bile acid conjugation, lipid absorption, hepatic metabolism, toxin excretion, and muscle contractility.

Factors influencing colostrum quality

The physicochemical quality and volume of colostrum are influenced by the interaction between genetics, nutrition, parity, seasonality, and sow management.

Genotype

The genetic background of the sow modulates proteins, lipids, lactose, immunoglobulins, and secondary metabolites. Duroc sows have been described as producing denser colostrum with a superior lipid fraction and higher IgG and IgA concentrations.

Seasonality

Seasonal conditions influence metabolites associated with oxidative stress and energy homeostasis. Winter colostrum may contain higher acetate concentrations, supporting thermogenesis, while summer heat stress can reduce feed intake and compromise colostrum quality.

Parity

Primiparous sows tend to produce lower volumes of colostrum but with higher lipid concentration, while multiparous sows produce greater volumes with higher lactose concentration. Parity also influences the maturity of the mammary immune system.

Diet and nutritional strategies

Colostrum composition shows high plasticity in response to late-gestation nutrition. Supplementing transition diets with metabolizable energy through vegetable oils may increase lipid content and improve the fatty acid profile of colostrum.

Increasing dietary amino acids has been associated with higher concentrations of carnitine and citrate, while functional amino acids such as BCAA may promote mammary lipogenesis and enhance casein content.

Arginine supplementation during late gestation may influence creatine and nitric oxide pathways, reduce stillbirths, and increase the proportion of heavier piglets at birth. Fibre source is also important, with high-fibre diets and ingredients such as sugar beet pulp associated with improvements in IgA, IgM, IL-10, and passive immunity.

General conclusions

In hyper-prolific production systems, colostrum is confirmed not only as a source of early nutrition, but also as a multifactorial biological determinant for farm success. Its complex composition bridges the postnatal energy gap and establishes a fundamental passive immune barrier.

Investing in the “colostrum phase” through maternal nutrition and management remains a fundamental pillar for ensuring resilience, profitability, and welfare in modern swine production.