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Making future udders: Mammary development and perinatal programming of dairy cattle
Jimena Laporta1, Maverick C Guenther1
1Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706.
JDS Communications
|January 7, 2026
Summary
Early mammary gland development in dairy cows is crucial for future milk production. Focused nutrition and environmental management during the perinatal period significantly enhance mammary parenchymal growth and lifelong function.
Area of Science:
- Developmental biology
- Mammalian reproduction
- Animal science
Background:
- The perinatal period is a critical window for mammary gland development in placental mammals.
- Early-life mammary gland development in dairy cattle is sensitive to environmental and nutritional factors.
- Preweaning mammary parenchymal growth significantly influences future lactational capacity.
Purpose of the Study:
- To investigate the allometric growth of mammary parenchymal tissue during the preweaning period in dairy cattle.
- To understand the impact of early-life management strategies on mammary gland development.
- To highlight the importance of developmental biology in heifer rearing for optimizing herd performance.
Main Methods:
- Comparative analysis of body weight, udder weight, mammary fat pad, and mammary parenchymal growth from birth to 60 days.
- Review of existing evidence on early-life management strategies (heat abatement, nutrition) and their effects on mammary development.
Main Results:
- Mammary parenchymal growth is highly allometric, expanding 15 to 35 times from birth to 60 days.
- Body weight doubles, while udder weight and mammary fat pad increase 2.2 to 3 times in the same period.
- Early-life heat abatement and enhanced nutrition positively influence mammary parenchymal development.
Conclusions:
- Preweaning mammary parenchymal growth is a key determinant of future lactation performance.
- Integrating developmental biology into heifer rearing is essential for lifelong mammary function.
- Precise environmental and nutritional management during the perinatal period optimizes herd performance.
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