Genome-wide association studies and genomic prediction of breeding values for calving performance and body conformation traits in Holstein cattle

Abo-Ismail, Mohammed K.; Brito, Luiz F.; Miller, Stephen P.; Sargolzaei, Mehdi; Grossi, Daniela A.; Moore, Steve S.; Plastow, Graham; Stothard, Paul; Nayeri, Shadi; Schenkel, Flavio S.

doi:10.1186/s12711-017-0356-8

Genetics Selection Evolution

Table 1 Heritability and number of records used in the association and validation analyses

From: Genome-wide association studies and genomic prediction of breeding values for calving performance and body conformation traits in Holstein cattle

Trait	Heritability^a	Number of records in the training population^b	Number of records in validation population^c
Calving performance
Calving ability, CA^d	0.300	4525	–
Daughter calving ability, DCA^e	0.060	3892	726
Maternal calving ease at first calving (heifer), CEh	0.121	3908	726
Maternal calf survival at first calving (heifer), CSh	0.056	3873	726
Maternal calving ease at later calvings (cow), CEc	0.084	3879	726
Maternal calf survival at later calvings (cow), CSc	0.023	3530	725
Direct calving ease at first calving (heifer), SCEh	0.017	4523	–
Direct calf survival at first calving (heifer), SCSh	0.004	4361	–
Direct calving ease at later calvings (cow), SCEc	0.016	4516	–
Direct calf survival at later calvings (cow), SCSc	0.003	4315	–
Rump
Rump, RUM	0.233	3573	927
Pin width, PW	0.340	3584	927
Pin setting, PS	0.087	3533	947
Rump angle, RAN	0.365	3573	927
Loin strength, LS	0.251	3576	947
Body traits
Dairy strength, DS	0.359	3584	927
Stature, ST	0.529	3589	927
Height at front end, FE	0.259	3577	947
Chest width, CW	0.218	3582	927
Body depth, BD	0.320	3582	927
Angularity, ANG	0.257	3582	927
Feet and legs
Feet and legs, FL	0.152	3572	927
Foot angle, FAN	0.109	3582	927
Heel depth, HD	0.076	3486	947
Bone quality, BQ	0.300	3584	947
Leg side view, LSV	0.244	3577	927
Set of rear legs, SRL	0.050	3564	947
Leg rear view, LRV	0.125	3555	927
Udder
Mammary system, MS	0.247	3587	927
Udder depth, UD	0.415	3577	927
Udder texture, UT	0.141	3588	947
Median suspensory ligament, MSL	0.140	3581	927
Fore udder attachment, FA	0.282	3587	927
Front teat placement, FTP	0.313	3584	927
Rear attachment height, RAH	0.234	3585	927
Rear attachment width, RAW	0.200	3579	947
Rear teat placement, RTP	0.294	3580	927
Teat length, TL	0.293	3581	927
Overall conformation score, CONF	0.261	3586	927

^aHeritability = heritability estimates were provided by Canadian Dairy Network
^bNumber of bulls in the training population with de-regressed EBV and used in the association analysis
^cNumber of bulls in the validation population
^dCA = calving ability index = 0.64 SCEh + 0.16 SCEc + 0.16 SCSh + 0.04 SCSc
^eDCA = daughter calving ability index = 0.36 CSh + 0.24 CSc + 0.24 CEh + 0.16 CEc

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ISSN: 1297-9686

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