Abstract
In this study, it was aimed to investigate the effects of red lighting on blood and milk melatonin levels, and milk quality. The experiment was carried out on 6 lactating Holstein Dairy cows, which were being reared at the Hümeyra Özgen Research and Application Farm, affiliated to Selcuk University Faculty of Veterinary Medicine. After a control period of 15 days in which night lighting was not applied (control group), night lighting was provided by LED bulbs emitting red light with a wavelength of 652 nm during the following 15-day trial period (experimental group). On days 5th, 10th and 15th days of the control and experimental groups, milk and blood samples were taken at the 06:00 am and at 06:00 pm.Serum and milk melatonin concentrations in the morning of the control, on days 5th, 10th and 15th; were 8.64±1.4, 7.02±0.97, 8.71±2.3, and 5.01±0.92, 5.23±0.35 , 3.93±0.81pg/ml, respectively while control evening group were respectively 8.59±1.8,7.53±2.14,8.35±0.94, 6.91±1.73, 6.8±1.27. It was obtained as 3.67±0.97 pg/ml. Serum and milk melatonin levels in the trial morning group were 10.93±2.06, respectively, on the same days; 15.37±2.6; 11.25±1.71 and 2.97±0.64; 5.7±1.06; While it was measured as 3.33±0.73 pg/ml, it was 14.83±3.11 in the trial evening group; 14.5±3.57; 12.95±4.09 and 4.42±0.61; 2.51±0.56; It was obtained as 2.48±0.79 pg/ml.It was observed that serum and milk melatonin levels and milk parameters were not adversely affected in the use of red LED lamps (652 nm) at night for 12h.
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