Figure 1From: The influence of oestrous substances on cyclicity and oestrous behaviour in dairy heifersExperimental design. A schematic view of all five cycles, where the second control cycle is shown in detail. All four experimental cycles followed the same schedule concerning blood sampling for oestradiol (O17β), progesterone (P4) and luteinising hormone (LH), ultrasonographic examination of the ovaries and oestrus detection.Back to article page