Effect of lactation stage, season and parity on milk cortisol concentration in Holstein cows

Michiru Fukasawa, Hideharu Tsukada, Takami Kosako, Akihisa Yamada

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

This experiment was designed (1) to study the effects of lactation stage, season, and parity on milk cortisol concentrations in Holstein cows, and (2) to elucidate the relationships between milk yield, quality, and milk cortisol concentration. Subjects of this study were 24 dairy cows kept in a free stall barn. Milk samples were taken on test day in May, August, November, and February. Data of milk yield, quality, and cortisol concentration were collected. Random effects of animals and fixed effects of lactation stage, test day, and parity on milk yield, quality, and cortisol concentration were analyzed using mixed models. We estimated the best linear unbiased prediction of each trait (BLUP) which was an animal-specific value. Correlation among milk yield, quality, and cortisol concentration was calculated using raw data and BLUP. The effect of the lactation stage on milk cortisol concentration was significant: the value observed in early lactation was higher than in other stages. However, the correlation between milk yield and cortisol concentration was low. The beginning of lactation might be a strong stressor for every cow. Calculated with raw data, milk cortisol concentration had respectively significant negative correlation with milk protein contents and solid not-fat contents. Calculated with BLUP, milk cortisol concentration showed a significant and negative correlation with milk protein contents. The lactation stage and milk protein contents should be considered for measurement of milk cortisol concentrations.

Original languageEnglish
Pages (from-to)280-284
Number of pages5
JournalLivestock Science
Volume113
Issue number2-3
DOIs
Publication statusPublished - 2008 Feb 1
Externally publishedYes

Keywords

  • Dairy cow
  • Lactation stage
  • Milk cortisol concentration
  • Parity
  • Test day

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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