Effects of dim light at night on milk yield, milk composition and endocrine profile of lactating dairy cows

Bal M. A., Penner G. B., Oba M., Kennedy A. D.

CANADIAN JOURNAL OF ANIMAL SCIENCE, cilt.88, sa.4, ss.609-612, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 88 Sayı: 4
  • Basım Tarihi: 2008
  • Doi Numarası: 10.4141/cjas07145
  • Dergi Adı: CANADIAN JOURNAL OF ANIMAL SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.609-612
  • Dokuz Eylül Üniversitesi Adresli: Hayır

Özet

Bal, M. A., Penner, G. B., Oba, M. and Kennedy, A. D. 2008. Effects of dim light at night on milk yield, milk composition and endocrine profile of lactating dairy cows. Can. J. Anim. Sci. 88: 609-612. The objective of this study was to evaluate the effects of night-time light intensity on lactation performance and hormonal profiles in lactating dairy cattle. Twenty-four multiparous lactating dairy cows were exposed to light intensities of 0 to 5 1x (CONTROL) or 40 to 60 1x (DIM-LIGHT) from 1800 to 0400 in a cross-over design with 28-d periods. Contrary to the pre-trial hypothesis, melatonin release was not suppressed by DIM-LIGHT at night, and treatment effects on milk and milk component yields were not detected.