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Table 1 Least square means (LSM ± SE) of the size of dominant follicles at ovulation following oestrous synchronisation

From: Ovarian follicular response to oestrous synchronisation and induction of ovulation in Norwegian Red cattle

Variable

Class

n

Size, LSM ± SE

Herd

1

9

13.2 ± 1.5a

2

10

19.6 ± 1.6b

3

6

14.8 ± 1.5

4

19

15.8 ± 1.2

Age

Heifers 14‒15 months

10

15.9 ± 1.0

Heifers 16‒18 months

13

17.1 ± 1.0

Heifers 19‒28 months

11

13.4 ± 1.5

Cows parity 1‒3

10

16.9 ± 1.6

Initial follicle sizec

≤ 10.0 mm

21

15.4 ± 0.7

> 10.0 mm

23

16.3 ± 0.8

BCS

Lean (2.5‒2.9)

6

15.5 ± 1.7

Moderate (3.0‒3.4)

20

15.2 ± 0.9

Fat (3.5‒4.0)

18

16.9 ± 0.8

  1. Number of animals (n) and least square means (LSM) ± standard error (SE) for size of the dominant follicle (diameter, mm) at ovulation by herd, and classes of age, initial follicle size1, and body condition score (BCS)
  2. a,bLSM within variable and column with different superscripts differ; P < 0.05
  3. cDiameter of the dominant follicle at the time of GnRH analogue treatment (T0)