Shasomal variations in sexual behaviour and semen quality of friesian, genubi and their f1 cross-bred bulis in Iraq

The present study was carried out at Abu-Gharib A.I • Center, Baghdad, Iraq. Eight pure Friesian bulls, five pure local Genubi bulls and five F1 Friesian x Genubi cross-bred bulls aged 2.5 years were used. Observations on the sexualbehaviour and semen quality of these bulls extended for one year, starting at June, 1975. Da i l.y variations in the max.i.mum shaCe and minimum temperatures, relative humidity and income of solar radiation were recorded for the area at which the experimerdiation income decreased to a minimum of 14. 8°C, 1.40C and O cals/cm2/day, respectively during December,1975; vhereasthe relative humidity increased to 79.2% during JanuarY,1976. he climatic factors changed thenceafter with the a~bient ;emperature and income of solar radiation increasing and the .¥lative humidi ty decre8sing till Nay, 1976 where tile exper- .wental peri