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Table 2 Numbers of detected QTL (1-Mb windows of the genome explaining ≥ 1% of additive genetic variance) for each trait in 10 US cattle breeds (ordered by sample size)

From: Large-effect pleiotropic or closely linked QTL segregate within and across ten US cattle breeds

Trait1

Simmental N = 4124

Angus N = 3570

Hereford N = 2779

Limousin N = 2239

Red Angus N = 1761

Gelbvieh N = 1374

Brangus N = 1328

Maine-Anjou N = 574

Shorthorn N = 328

Charolais N = 200

All breeds

Birth weight

7

4

5

2

5

5

2

2

3

2

37

Calving ease direct

5

4

3

3

5

4

1

2

2

0

29

Calving ease maternal

3

2

9

4

3

6

0

2

1

0

30

Carcass weight

9

3

-

2

4

3

2

1

2

1

27

Fat thickness

3

2

5

-

1

0

2

0

0

1

14

Marbling

0

1

1

3

3

6

5

0

1

0

20

Mature weight

-

1

9

-

-

-

-

-

-

-

10

Ribeye muscle area

3

4

4

3

1

2

2

0

4

1

24

Weaning weight direct

7

2

5

3

4

4

3

3

1

2

34

Weaning weight maternal

5

2

6

2

3

1

1

5

1

2

28

Yearling weight

8

2

6

1

3

2

1

3

2

3

31

Yield grade

3

-

-

1

5

1

-

0

-

-

10

All traits

53

27

53

24

37

34

19

18

17

12

2942`

  1. 1Birth weight: live weight at birth. Calving ease direct: the ability of a calf to be born unassisted because of its size and length of gestation. Calving ease maternal: the genetic ability of a dam for unassisted calving of her newborn because of her own pelvic size, her ability to relax the pelvis and the ability of her uterus to limit fetal growth to a manageable size. Carcass weight: weight recorded just before the carcass enters the chilling room during the processing of finished cattle. Fat thickness: the amount of fat opposite the ribeye muscle at the cut surface between the 12th and 13th ribs. Marbling: the amount and distribution of intramuscular fat on the cut surface of the ribeye muscle between the 12th and 13th ribs. Mature weight: live body weight at maturity. Ribeye muscle area: area measurement on the cut surface of the ribeye muscle between the 12th and 13th ribs. Weaning weight direct: the pre-weaning growth ability of a calf. Weaning weight maternal: the milking and mothering ability of a dam for pre-weaning growth of a calf. Yearling weight: live weight at yearling. Yield grade: the estimated amount of boneless, closely trimmed retail cuts from the high-value parts of the carcass-the round, loin, rib, and chunk.
  2. 2Some of the identified QTL were associated with more than one trait (pleiotropic QTL) or segregating in more than one breed (across-breed QTL), leaving a total of 159 unique QTL.
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BMC Genomics

ISSN: 1471-2164

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