I got me a cow what took right away her first time with tha bull, (bred her at 18 months), she calved with no problem. She calved out in august of 07, never once showed a sign a bein in season after that first calf. She was in with tha bull for about 6 months after she calved. She appears ta be open at this time. Could anyone venture a guess as ta what the ratio be between cows what do this and cows what carry on a normal cycle ? Also, be there any particular condition what could cause this, or is it just tha luck o tha draw?