Genetics Selection Evolution

Table 6 Accuracies of prediction (r) of average first parity PTA from 25 young ¹ and older ² sires

From: Evaluating alternate models to estimate genetic parameters of calving traits in United Kingdom Holstein-Friesian dairy cattle

	Young sires¹		Older sires²
	Direct	Maternal	Direct	Maternal
Average progeny group size	88	12	122	101
Model³	r	R	r	r
CE ⁴
Univariate S-MGS⁵	0.67	0.46	0.68	0.61
Univariate A1	0.71	0.50	0.72	0.60
Bivariate with GL	0.70	0.52	0.71	0.60
Bivariate with SB	0.71	0.49	0.72	0.64
Bivariate between parities	0.77	0.50	0.82	0.66
GL ⁴
Univariate S-MGS⁵	0.77	0.69	0.83	0.75
Univariate A1	0.85	0.45	0.86	0.59
Bivariate with CE	0.86	0.46	0.87	0.59
Bivariate with SB	0.84	0.46	0.86	0.56
Bivariate between parities	0.90	0.78	0.93	0.87
SB ⁴
Univariate S-MGS⁵	0.31	0.34	0.51	0.54
Univariate A1	0.39	0.40	0.49	0.48
Bivariate with CE	0.55	0.42	0.65	0.54
Bivariate with GL	0.38	0.46	0.51	0.57
Bivariate between parities	-	-	-	-

¹born between 1999 and 2002; ²born between 1990 and 1994; ³ S-MGS = sire-maternal grandsire model, A1 = animal model 1, excludes animals recorded at both birth and calving; ⁴CE = calving ease, GL = gestation length, SB = stillbirth; ⁵for S-MGS models, values are based on sire and maternal grandsire variances.

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ISSN: 1297-9686

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