caa a22 4500 388061227 CHVBK 20180307125121.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1017/S1357729800008833 doi S1357729800008833 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800008833 Differential response of dairy cows to supplementary light during increasing or decreasing daylength [Elektronische Daten] Two experiments were conducted to compare the response oflactating cows to supplementary light in their lying area during increasing and decreasing natural daylength. During decreasing daylength, supplementary light in the lying area increased the time cows spent lying down and considerably reduced calculated food intake, milk production, live weight and body condition, so that lights were installed in the feeding area for the last half of the experiment, which partially restored intake and live weight. Plasma cortisol concentrations and milk somatic cell counts were increased by supplementary light in decreasing daylength before, but not after, lights were installed in the feeding passage, suggesting that cows may have been stressed by the difficulties encountered during feeding in the dark. During increasing daylength supplementary light did not affect lying time, had less effect on food intake and no effect on milk production or live weight. There was a small reduction in plasma corticosteroid by the end of the experiment with supplementary light. It is concluded that providing supplementary light only in the lying area of dairy cows will have adverse effects on their production and welfare in decreasing, but not increasing daylength Copyright © British Society of Animal Science 1998 behaviour nationallicence dairy cows nationallicence housing nationallicence lighting nationallicence milk production nationallicence Phillips C. J. C. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW Lomas C. A. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW Arab T. M. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW Animal Science Cambridge University Press 66/1(1998-02), 55-63 1357-7298 66:1<55 1998 66 ASC https://doi.org/10.1017/S1357729800008833 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800008833 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Phillips C. J. C. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW NATIONALLICENCE 700 1- Lomas C. A. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW NATIONALLICENCE 700 1- Arab T. M. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW NATIONALLICENCE 773 0- Animal Science Cambridge University Press 66/1(1998-02), 55-63 1357-7298 66:1<55 1998 66 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge