Temporal trends in reproductive performance in Irish dairy herds and associated risk factors

Table 2 Fertility traits in the Teagasc Farm Fertility Study (Source: [5])

Fertility trait	Herd mean	Herd range
Pre-breeding^a
Anovulation (%)	10	0 - 21
Cystic ovaries (%)	3	0 - 10
Subclinical endometritis (%)	24	8 - 38
Pyometra (%)	2	0 - 8
Breeding season
Calving-to-first service (days)	71	59 - 92
Calving-to-conception (days)	88	73 - 103
Submission rate (21-days) (%) ^b	70	25 - 96
Conception rate to first service (%)	48	29 - 71
Infertile rate (%)	14	2 - 40
Breeding season (weeks)	15	9 - 25

^a Determined by ultrasonography approximately one week before the date set for the start of mating.
^b Percentage of calved cows submitted for service in the first 21 days of the breeding season.

ISSN: 2046-0481