Means Used for Calculating PTA%

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April 2012 across breed base adjustment parameters

Breeding value (2*PTA) differences from Holstein

Breed	Milk	Fat	Protein	Productive Life	Somatic Cell Score	Daughter Pregnancy Rate
Ayrshire	-5699	-156	-147	0.6	-0.19	2.5
Brown Swiss	-4380	-92	-81	0.3	-0.08	0.2
Guernsey	-6301	-89	-152	-9.3	0.16	0.2
Jersey	-6505	-77	-114	2.9	0.20	5.2
Milking Shorthorn	-6791	-234	-195	0.3	-0.11	5.3

PTA differences from Holstein

Breed	Milk	Fat	Protein	Productive Life	Somatic Cell Score	Daughter Pregnancy Rate
Ayrshire	-2849	-78	-73	0.3	-0.09	1.3
Brown Swiss	-2190	-46	-40	0.1	-0.04	0.1
Guernsey	-3151	-45	-76	-4.7	0.08	0.1
Jersey	-3253	-38	-57	1.4	0.10	2.6
Milking Shorthorn	-3395	-117	-98	0.2	-0.05	2.7

Standard deviation ratio

Breed	Milk	Fat	Protein	Productive Life	Somatic Cell Score	Daughter Pregnancy Rate
Ayrshire	0.80	0.80	0.80	1.00	1.05	0.94
Brown Swiss	0.91	0.91	0.91	1.00	0.95	1.01
Guernsey	0.90	0.90	0.90	1.00	1.05	0.99
Holstein	1.00	1.00	1.00	1.00	1.00	1.00
Jersey	0.89	0.89	0.89	1.00	0.90	0.94
Milking Shorthorn	0.75	0.75	0.75	1.00	0.93	0.93

Trait means for base cows

Breed	Milk	Fat	Protein	Productive Life	Somatic Cell Score	Daughter Pregnancy Rate
Ayrshire	18255	706	576	30.5	2.71	22.7
Brown Swiss	22097	884	732	29.2	2.74	19.3
Guernsey	17138	757	558	25.1	3.33	19.4
Holstein	26077	952	784	27.0	2.76	22.6
Jersey	18458	846	657	31.9	3.07	26.6
Milking Shorthorn	16840	622	521	29.0	3.04	24.8

Heterosis value

Milk	Fat	Protein	Productive Life	Somatic Cell Score	Daughter Pregnancy Rate
452	26	18	0.0	0.10	1.5

Inbreeding Regression

Milk	Fat	Protein	Productive Life	Somatic Cell Score	Daughter Pregnancy Rate
-65.3	-2.372	-2.145	-0.22	0.003	-0.078

Base Cow Expected Future Inbreeding (EFI)