Lactation: Galactopoiesis, Seasonal Effects

Robert J Collier, Donato Romagnolo, L. H. Baumgard

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations


Three management tools consistently increase milk yield in lactating dairy cows during established lactation: administrating exogenous bovine somatotropin, increased milking frequency, and increased photoperiod. Short day length during the dry period also increases milk yield postpartum. Season of year affects both yield and composition of milk. Seasonal variables known to impact milk and composition yield are photoperiod and thermal environmental variables such as temperature, wind speed, solar infrared load, and humidity. Milk composition can also be markedly altered by nutritional management. This permits the opportunity to improve the nutritional value of milk by altering milk composition through dietary management.

Original languageEnglish (US)
Title of host publicationEncyclopedia of Dairy Sciences
Subtitle of host publicationSecond Edition
PublisherElsevier Inc.
Number of pages7
ISBN (Electronic)9780123744029
ISBN (Print)9780123744074
StatePublished - Jan 1 2011


  • Bovine somatotropin
  • Conjugated linoleic acid
  • Galactopoiesis
  • Heat stress
  • Humidity
  • Mammary growth
  • Management
  • Milk composition
  • Milk fat
  • Milk lactose
  • Milk protein
  • Milk yield
  • Milking frequency
  • Nutrition
  • Photoperiod
  • Season
  • Secretory activity
  • Temperature
  • Wind speed

ASJC Scopus subject areas

  • General Engineering
  • General Agricultural and Biological Sciences


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