| The oestrus cycle is controlled by a complex system involving different hormones produced in the brain and ovary. |
| With a non-slippery surface, cows are much more likely to exhibit the activity signs of oestrus. |
| It is concluded that the endocannabinoid system undergoes to adaptive changes between the oestrus and dioestrus phases. |
| After calving, cows normally undergo a 20 to 30 day period when oestrus cycles do not occur. |
| The length of the oestrus cycle may vary but it usually ranges from about 17 to 24 days. |
| If potential mates are too scattered during the breeding season, some females in oestrus may fail to encounter suitable male partners. |
