1 A cow cycles (comes into oestrous) every 21 days
2 Cycling cows ride each other to assert dominance
3 Tail painting is the best way of checking when cows are cycling
4 There are two types of breeding, AI (artifiical insemintion) or natural
5 AI is common in the dairy industry and natural mating is more often used in the beef sector
6 For natural mating an ideal ratio is 1 bull to 10-25 cows
7 Bull fertility will begin to decline after 6-7 years of age
8 The average gestation period of a cow is 283 days so a cow successfully mated on the 22 October is due on 1 August.
DIY advice for lifestylers, written by Kiwi Cattle Yards owner, Euan Seymour.