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    Effect of space allowance on behaviour of newborn milk-fed dairy calves
    (Elsevier Science Bv, 2006) Tapki, Ibrahim; Sahin, Ahmet; Onal, Ali Galip
    This study was carried out to investigate the behaviour of newborn milk-fed dairy calves in different sized individual pens. Twenty-one Holstein Friesian calves were allocated to three different sized pen types (small 1 m x 1.5 m, medium 1.5 m x 1.5 m and large 2 m x 2 m) located in a semi-open barn for 60 days following 3-day colostrum feeding. Each calf was observed twice a week for 1 h at 5 min intervals in different times of a day after the initiation of daily feeding. Animals were monitored for eating, ruminating, drinking, walking, standing, playing and resting activities. The proportional count of eating 17.10, 19.74, 20.02%; ruminating, 13.21, 16.42, 14.81 %; drinking 1.42, 2.18, 0.84%; walking 0.76, 4.23, 5.85%; standing 23.34, 19.66, 15.07%; playing 2.11, 2.80, 2.59% and resting 39.95, 30.60, 38.46% respective to the space allowances small, medium and large were found significantly different (P < 0.01). Space allowance differences did not significantly affect calf starter intake and alfalfa hay intake as found no significant effect on daily live weight gain (P > 0.05). Results showed that the increased space allowances from 1.5 to 4 m(2) for each calf changed the behaviour of dairy calves. Space allowance of 1.5 m(2) for each calf resulted in the higher percentage of standing behaviour compared to the larger space allowances. In conclusion, there was no effect of space allowance on daily live weight gain of dairy calves; but most likely, feel themselves better when kept in medium and large sized pens based on the determined behavioural results. (c) 2005 Elsevier B.V. All rights reserved.
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    Effects of chronic exposure to 2G/3G cell phone radiation on in vitro maturation of bovine oocytes
    (Agricultural Research Communication Centre, 2018) Guzey, Yusuf Ziya; Onal, Ali Galip
    Mobile phone use has arisen and rapidly been increased during last decades and therefore electromagnetic radiation or heat sourcing from mobile phones and its possible damages has become focus of interest. The aim of the present study was to investigate the effects of mobile phone signals on in vitro maturation of bovine oocytes. A total of 224 bovine cumulus oocyte complexes were matured in vitro and separated into two groups, and only treatment group received mobile phone signals for 100 min by calling 5 min/h. Following maturation period, oocytes were stained by fluorescent stain to assess maturation rates. The results showed that oocytes reaching Metaphase I and Metaphase II stage were 35.2 +/- 2.24 % and 48.2 +/- 2.21 % for treatment group whereas 11.9 +/- 1.45 % and 73.8 +/- 4.60 % for controls, respectively (P<0.01). In conclusion, bovine oocyte maturation has been significantly reduced by mobile phone signals.