Herd fertility Flashcards
What is the average UK dairy cow fertility?
34%
What is the voluntary wait period?
Wait 42 to 50 days before serving after parturition
What is the submission rate?
Proportion fo cows that are submitted for AI of the whole group that are eligable for service
What is the calving to first serving interval?
Number of days from calving to first AI
Should be <69 days
What is the calving interval?
The interval for an individual cow between one calving and another
What is the calving index?
Average of the calving intervals of all the cows in the herd
Should be 287 days
What is the calving to conception interval?
Number of days from calving to successful AI service that results in pregnancy
Easier to look at than calving interval
What is the conception rate?
Percentage of cows pregnant of those that are served
What is the pregnancy rate?
Combines conception rate and submission rate
The percentage eligible for service that conceived
What are common reasons for poor fertility indices?
Failure to cycle after calving
Bad oestrus detection
Low conception rate
Wrong voluntary wait period
When should heifers calve to be have the most profitable lifetime yield?
2 years
What is a rolling mean?
Average performance over a given time period
