State and National Standardized Lactation Averages by Breed

AIPL RESEARCH REPORT
K2-07 (2-09)

State and national standardized lactation averages by breed for cows calving in 2007

H.D. Norman and F.A. Ross, Jr.
Animal Improvement Programs Laboratory, ARS-USDA, Beltsville, MD 20705-2350
301-504-8334 (voice) ~ 301-504-8092 (fax) ~ inquiry@aipl.arsusda.gov ~ http://aipl.arsusda.gov

Lactation yields are often standardized to provide a reasonably equitable comparison of dairy cows with different lactation characteristics (e.g., calving age, days milked, milking frequency, etc.). This report provides averages of standardized yield for calvings during 2007 for each State and the nation by breed. The data originated from herds enrolled in Dairy Herd Improvement (DHI) programs. The test-day data used by the Animal Improvement Programs Laboratory to determine the lactation records were provided by the dairy records processing centers (DRPC's). Participation in DHI programs and DRPC activity also have been summarized using the same data source.

Only data used in calculation of national genetic evaluations are included in the State and national averages. Thus, records beyond fifth lactation or by cows that lacked either a first-lactation record or valid sire identification were excluded. For other editing requirements, see complete evaluation documentation.

Breed yields are different between this report and the herd-average report because this report summarizes standardized lactation yield (i.e.., yield adjusted to 305 days and twice a day milking), whereas the herd-average report is determined from actual herd yields. Input data to the herd-average reports are not restricted to those usable for national genetic evaluations. The herd-average report also is impacted by lactation length and dry period. Relative yields among breeds differ between the two reports because of large breed differences in percentage of usable records and differences in age-parity factors. Also, the herd-average reports tend to be more current (about 6 mo) than the standardized yield reports released at the same time.

Lactation records were calculated using the best prediction method starting in 1997 and were standardized for age-parity, calving month, previous days open, and times milked per day. Records shorter than 305 days were extended to 305 days as part of the best prediction process. Prior to 1997, the records were calculated using the test interval method. The change in how lactation records were calculated was responsible for a portion of the observed yield increases between 1996 and 1997 because the best prediction method gives a more favorable prediction for lower producing cows than does the test interval method. Numbers of records and averages for yields and component percentages are in Tables 1 through 7 by State for Ayrshires, Brown Swiss, Guernseys, Holsteins, Jerseys, Milking Shorthorns, and Red and Whites, respectively. Component percentages were computed from averages of standardized yields for milk and components. This year is the first that 100% of the cows tested for fat also have protein information. Only 97% of the cows had protein percentage and yield last year.

Numbers of records and national averages for milk and component yields and component percentages are in Table 8 by breed for selected years. Only Holsteins and Jerseys had increased calvings (Table 8A) in 2007. Holstein calvings were up 4.2%; Jersey calvings increased by 4.4%. Average milk yield (Table 8B) was down slightly (−0.5 to −0.1%) for Ayrshires, Holsteins, and Milking Shorthorn. Guernseys, which increased the most (1.4%) last year, declined the most this year (−0.9%). Only Brown Swiss and Jerseys increased in average milk yield (0.6%). Fat percentage (Table 8C) showed little change for all breeds, up or down by less than 0.03%. Fat yield (Table 8D) increased by 1 and 3 pounds for Red and Whites and Milking Shorthorns, respectively, but declined for all other breeds (1 to 10 pounds). Protein percentage (Table 8E) never changed by more than 0.01 for any of the breeds. Breed-average protein yield (Table 8F) increased from 2 to 3 pounds for Jerseys and Brown Swiss but decreased by 1 and 6 pounds for four of the other breeds. Ayrshire average protein yield remained the same.

Although milk and beef prices, feed availability and operating expenses, Government programs, and characteristics of herds entering and leaving eligible testing programs can affect production averages, genetic change continues to have a positive effect on yield. The leveling off of average yields most likely reflects changes in management strategies and more genetic emphasis on other traits such as health and longevity. For instance, average somatic cell count during 2008 dropped considerably from 2007 (herd somatic cell count report), and days open is no longer increasing. Interpretation of trends in lactation averages should be made in view of other changes affecting profitability and will be impacted by changes in number of records across years as well.

DHI Lactation Averages for Ayrshire

Table 1. Ayrshire State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	4	14,267	3.53	503	3.10	443	100
Arizona	1	22,241	3.82	849	3.20	712	100
Arkansas	34	16,070	4.02	646	3.26	524	100
California	19	23,687	3.78	896	3.09	732	100
Colorado	6	20,193	3.89	785	3.26	658	100
Connecticut	113	19,549	3.97	776	3.17	619	100
Delaware	1	18,300	3.93	720	3.21	588	100
Florida	1	19,992	3.58	715	3.00	599	100
Idaho	1	17,648	4.39	775	3.38	597	100
Illinois	242	18,145	3.83	696	3.13	567	100
Indiana	59	16,076	3.75	603	3.17	510	100
Iowa	571	19,978	3.79	756	3.15	629	100
Kansas	70	16,117	3.64	587	3.16	509	100
Kentucky	25	15,127	3.21	486	3.23	488	100
Louisiana	7	15,407	3.67	565	2.99	461	100
Maine	124	17,241	3.71	639	3.07	529	100
Maryland	313	20,095	4.03	809	3.15	633	100
Massachusetts	26	17,488	3.77	659	3.12	546	100
Michigan	56	19,499	3.79	739	3.09	603	100
Minnesota	204	17,792	3.83	681	3.10	551	100
Missouri	89	15,240	3.87	590	3.13	477	100
Nebraska	59	15,065	3.79	571	3.18	479	100
New Hampshire	124	17,638	3.87	682	3.12	551	100
New Jersey	18	15,803	4.00	632	3.14	496	100
New Mexico	185	17,060	3.93	671	3.18	543	100
New York	1,087	17,983	3.80	684	3.12	561	100
North Carolina	42	18,504	3.95	731	3.15	584	100
Ohio	437	18,577	3.85	715	3.16	587	100
Oklahoma	99	19,725	3.56	702	3.09	609	100
Oregon	38	17,004	3.70	630	3.12	530	100
Pennsylvania	910	18,776	3.79	711	3.11	583	100
Rhode Island	43	16,640	4.26	709	3.23	537	100
South Carolina	6	18,446	4.17	769	3.10	572	100
Tennessee	15	16,215	3.56	578	3.07	497	100
Texas	76	16,942	3.88	657	3.21	543	100
Utah	20	12,904	3.62	467	3.32	428	100
Vermont	398	16,952	3.84	651	3.11	527	100
Virginia	24	17,143	3.81	654	3.13	537	100
Washington	28	18,610	3.98	741	3.25	604	100
West Virginia	19	16,887	3.75	633	3.10	523	100
Wisconsin	604	18,021	3.80	684	3.11	561	100
US	6,198	18,220	3.82	696	3.13	570	100

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DHI Lactation Averages for Brown Swiss

Table 2. Brown Swiss State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	7	23,731	3.46	821	3.09	733	100
Arizona	130	24,351	3.76	915	3.19	777	100
Arkansas	91	17,109	3.92	670	3.34	572	100
California	463	22,751	3.86	878	3.30	751	100
Colorado	167	22,448	3.63	814	3.24	728	100
Connecticut	54	18,465	3.94	728	3.24	599	100
Delaware	4	20,903	4.02	840	3.34	697	100
Florida	33	21,069	3.74	787	3.09	651	100
Georgia	99	20,897	3.70	774	3.23	675	100
Idaho	250	21,040	3.87	814	3.40	715	100
Illinois	669	20,283	4.03	817	3.30	669	100
Indiana	544	22,880	4.00	916	3.33	762	100
Iowa	1,524	21,664	3.98	862	3.34	723	100
Kansas	177	21,807	3.80	828	3.34	728	100
Kentucky	101	19,943	3.74	746	3.28	654	100
Louisiana	82	15,770	3.42	539	3.14	495	100
Maine	30	18,150	3.82	693	3.28	595	100
Maryland	320	21,841	4.09	892	3.35	732	100
Massachusetts	141	21,408	4.14	887	3.31	709	100
Michigan	382	23,576	3.90	919	3.33	786	100
Minnesota	1,557	22,710	4.03	915	3.26	739	100
Mississippi	7	18,501	3.70	684	3.24	600	100
Missouri	458	18,948	4.11	779	3.39	643	100
Montana	1	25,600	4.27	1094	3.54	905	100
Nebraska	146	19,314	4.03	779	3.33	643	100
Nevada	2	30,294	3.69	1117	2.49	754	100
New Hampshire	112	17,846	4.05	722	3.28	586	100
New Jersey	6	24,479	3.96	969	3.29	806	100
New Mexico	15	22,110	3.59	794	3.24	717	100
New York	1,328	21,149	3.99	845	3.28	693	100
North Carolina	55	22,815	3.97	907	3.25	742	100
North Dakota	88	17,220	4.09	704	3.44	593	100
Ohio	1,379	21,208	3.97	841	3.31	703	100
Oklahoma	57	15,347	3.74	574	3.29	505	100
Oregon	299	21,656	3.91	846	3.29	713	100
Pennsylvania	1,291	21,641	4.00	866	3.29	712	100
Puerto Rico	43	15,898	3.00	476	3.22	512	100
Rhode Island	1	16,478	4.05	667	3.29	542	100
South Carolina	12	22,718	3.83	870	3.20	728	100
South Dakota	143	19,602	4.30	843	3.33	652	100
Tennessee	188	17,482	3.82	668	3.30	577	100
Texas	426	19,079	3.97	758	3.34	637	100
Utah	34	19,810	4.08	809	3.29	653	100
Vermont	391	20,896	4.14	866	3.37	704	100
Virginia	176	22,664	3.89	882	3.22	729	100
Washington	301	21,877	3.92	858	3.36	735	100
West Virginia	15	24,490	4.01	982	3.36	822	100
Wisconsin	3,607	22,415	3.98	893	3.27	733	100
US	17,406	21,533	3.98	856	3.30	710	100

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DHI Lactation Averages for Guernsey

Table 3. Guernsey State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Arizona	5	19,037	3.64	694	2.93	558	100
Arkansas	7	15,350	4.26	653	3.34	512	100
California	386	18,773	4.20	789	3.30	620	100
Colorado	2	19,310	5.89	1137	3.21	621	100
Connecticut	38	17,821	4.30	767	3.35	597	100
Delaware	1	14,374	4.84	696	3.35	481	100
Florida	1	23,341	3.44	803	3.12	728	100
Idaho	25	17,457	4.46	778	3.37	588	100
Illinois	127	16,362	4.41	722	3.23	529	100
Indiana	249	17,048	4.27	728	3.32	565	100
Iowa	560	17,954	4.38	787	3.29	591	100
Kansas	44	18,634	4.34	809	3.34	622	100
Kentucky	18	17,185	3.81	654	3.21	551	100
Louisiana	1	10,173	4.00	407	3.12	317	100
Maine	44	15,369	4.49	690	3.31	508	100
Maryland	335	15,888	4.53	719	3.36	534	100
Massachusetts	27	13,595	4.67	634	3.29	448	100
Michigan	27	13,610	4.02	548	3.12	424	100
Minnesota	339	16,192	4.33	701	3.22	521	100
Missouri	308	15,516	4.43	687	3.36	521	100
Nebraska	63	18,034	4.47	806	3.33	600	100
New Hampshire	10	16,106	4.60	741	3.37	542	100
New Jersey	5	18,912	4.23	799	3.11	587	100
New York	562	17,115	4.42	757	3.22	551	100
North Carolina	34	15,451	4.46	689	3.27	505	100
Ohio	260	17,690	4.50	796	3.30	584	100
Oklahoma	40	15,430	4.07	628	3.20	494	100
Oregon	283	18,323	4.29	785	3.22	590	100
Pennsylvania	657	17,041	4.36	743	3.23	550	100
South Carolina	42	15,527	4.39	681	3.25	505	100
South Dakota	57	13,325	4.32	575	3.23	431	100
Tennessee	80	16,416	4.20	689	3.19	524	100
Texas	116	15,019	4.09	614	3.22	484	100
Vermont	122	15,157	4.53	686	3.30	501	100
Virginia	100	16,785	4.53	760	3.31	556	100
Washington	117	17,890	4.44	795	3.34	598	100
West Virginia	8	15,159	4.63	702	3.54	537	100
Wisconsin	1,627	18,127	4.45	806	3.24	588	100
US	6,727	17,243	4.39	757	3.27	563	100

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DHI Lactation Averages for Holstein

Table 4. Holstein State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	832	21,235	3.43	728	3.02	641	100
Arizona	19,209	24,737	3.55	877	2.98	738	100
Arkansas	1,414	21,648	3.51	761	3.04	658	100
California	405,272	26,476	3.58	947	3.00	795	100
Colorado	12,893	25,730	3.57	919	3.10	797	100
Connecticut	6,411	24,226	3.71	899	3.06	741	100
Delaware	2,264	24,817	3.82	948	3.01	746	100
Florida	6,397	23,683	3.58	848	2.95	698	100
Georgia	8,241	23,201	3.54	822	3.00	695	100
Idaho	62,022	26,489	3.57	945	3.06	810	100
Illinois	24,671	24,832	3.66	908	3.02	751	100
Indiana	17,964	24,676	3.68	907	3.01	743	100
Iowa	48,460	25,415	3.64	925	3.04	772	100
Kansas	11,698	24,172	3.73	902	3.07	743	100
Kentucky	6,911	23,329	3.60	840	3.03	708	100
Louisiana	1,991	20,342	3.41	693	2.99	607	100
Maine	6,250	24,502	3.69	904	3.03	743	100
Maryland	18,789	24,347	3.75	913	3.03	739	100
Massachusetts	4,502	24,770	3.84	952	3.06	757	100
Michigan	66,766	26,592	3.71	985	2.98	791	100
Minnesota	132,569	24,984	3.71	926	3.00	749	100
Mississippi	2,085	23,151	3.55	821	2.96	685	100
Missouri	9,410	22,038	3.64	802	3.08	678	100
Montana	2,493	25,859	3.60	930	2.97	769	100
Nebraska	9,847	24,050	3.63	872	3.04	732	100
Nevada	5,123	27,754	3.47	962	2.94	815	100
New Hampshire	5,686	26,245	3.72	977	3.05	802	100
New Jersey	3,286	24,320	3.69	898	3.00	729	100
New Mexico	19,184	24,933	3.55	884	3.04	758	100
New York	188,339	25,325	3.68	933	3.03	766	100
North Carolina	10,891	24,540	3.76	923	3.01	739	100
North Dakota	2,383	24,421	3.65	891	3.01	735	100
Ohio	47,460	25,007	3.69	922	3.02	756	100
Oklahoma	3,107	22,145	3.43	759	3.03	670	100
Oregon	17,235	25,142	3.73	938	3.05	767	100
Pennsylvania	172,424	25,385	3.66	928	3.00	761	100
Puerto Rico	1,927	14,459	2.99	432	2.95	427	100
Rhode Island	56	23,053	3.80	875	3.01	694	100
South Carolina	4,228	24,687	3.53	870	2.99	737	100
South Dakota	9,308	24,614	3.68	907	3.03	745	100
Tennessee	7,256	23,357	3.77	881	2.98	696	100
Texas	21,616	23,600	3.69	872	3.10	731	100
Utah	12,265	24,788	3.59	891	3.06	759	100
Vermont	25,398	25,236	3.70	934	3.07	775	100
Virginia	31,173	24,278	3.64	883	2.98	724	100
Washington	33,979	26,102	3.65	954	3.06	798	100
West Virginia	2,157	23,520	3.66	861	3.03	712	100
Wisconsin	278,858	26,357	3.70	976	3.00	790	100
Wyoming	405	26,452	3.60	952	2.94	778	100
US	1,793,105	25,639	3.65	936	3.01	772	100

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DHI Lactation Averages for Jersey

Table 5. Jersey State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	1,401	15,604	4.43	692	3.55	554	100
Arizona	5,892	18,533	4.53	839	3.48	644	100
Arkansas	130	14,858	4.83	718	3.47	515	100
California	48,796	19,542	4.54	888	3.58	699	100
Colorado	338	18,944	4.92	932	3.42	647	100
Connecticut	487	16,489	4.69	773	3.55	585	100
Delaware	87	22,412	4.65	1043	3.35	751	100
Florida	111	17,151	4.61	791	3.35	574	100
Georgia	290	15,433	4.40	678	3.48	536	100
Idaho	3,835	18,717	4.59	860	3.66	685	100
Illinois	1,517	16,791	4.57	768	3.57	600	100
Indiana	1,147	17,007	4.59	780	3.58	608	100
Iowa	3,589	18,250	4.65	849	3.57	651	100
Kansas	1,135	17,589	4.57	803	3.60	633	100
Kentucky	1,087	15,776	4.42	698	3.52	555	100
Louisiana	135	16,748	3.90	654	3.40	569	100
Maine	655	17,018	4.70	800	3.57	607	100
Maryland	976	17,180	4.71	809	3.64	625	100
Massachusetts	720	16,798	4.70	790	3.58	602	100
Michigan	1,219	16,830	4.73	796	3.59	604	100
Minnesota	2,589	17,221	4.59	790	3.52	606	100
Mississippi	530	16,892	4.32	730	3.48	588	100
Missouri	1,680	15,490	4.56	707	3.58	555	100
Montana	10	15,430	4.56	704	3.78	584	100
Nebraska	427	19,678	4.47	879	3.55	698	100
Nevada	345	17,761	4.47	795	3.58	635	100
New Hampshire	545	17,139	4.63	793	3.61	619	100
New Jersey	106	15,995	4.88	781	3.55	567	100
New Mexico	1,902	17,360	4.56	791	3.59	624	100
New York	5,724	17,785	4.56	810	3.51	625	100
North Carolina	2,132	19,364	4.44	859	3.48	674	100
North Dakota	53	16,909	4.64	784	3.62	613	100
Ohio	7,054	17,859	4.72	843	3.58	640	100
Oklahoma	911	15,563	4.31	671	3.58	556	100
Oregon	8,684	18,437	4.62	851	3.64	672	100
Pennsylvania	7,260	17,219	4.66	802	3.56	612	100
Puerto Rico	52	13,320	3.23	431	3.29	438	100
Rhode Island	4	17,160	4.65	797	3.59	617	100
South Carolina	2,239	17,966	4.57	821	3.49	628	100
South Dakota	659	18,015	4.71	848	3.53	635	100
Tennessee	2,028	16,626	4.59	763	3.50	581	100
Texas	6,914	16,128	4.45	718	3.61	583	100
Utah	1,741	17,475	4.60	804	3.64	636	100
Vermont	2,463	16,220	4.68	759	3.58	581	100
Virginia	1,011	17,827	4.48	799	3.48	621	100
Washington	2,493	17,691	4.53	802	3.59	635	100
West Virginia	339	19,203	4.50	863	3.60	691	100
Wisconsin	10,192	18,383	4.68	861	3.56	655	100
US	143,634	18,265	4.58	836	3.57	652	100

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DHI Lactation Averages for Milking Shorthorn

Table 6. Milking Shorthorn State and National Standardized Lactation Averages for Cows Calving in 2007 With
Records Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	1	20,163	4.29	865	3.10	625	100
Arizona	280	13,680	3.38	462	3.01	412	100
Arkansas	105	18,311	4.03	738	3.23	591	100
California	201	19,974	3.29	658	2.96	592	100
Colorado	14	21,831	3.50	763	3.24	708	100
Connecticut	7	15,622	3.54	553	3.01	470	100
Georgia	3	12,617	3.55	448	3.16	399	100
Idaho	65	19,682	3.24	637	3.07	603	100
Illinois	37	16,764	3.65	613	3.09	518	100
Indiana	49	17,250	3.67	633	3.21	555	100
Iowa	85	19,328	3.69	713	3.09	598	100
Kansas	25	18,861	3.62	683	3.07	579	100
Kentucky	1	18,250	3.84	700	3.02	551	100
Louisiana	1	20,352	4.41	898	2.82	574	100
Maine	23	19,106	3.64	696	3.04	581	100
Maryland	21	18,704	3.79	708	3.04	568	100
Massachusetts	16	14,673	3.81	558	3.13	459	100
Michigan	21	17,193	3.87	665	3.15	542	100
Minnesota	324	17,158	3.75	644	3.06	525	100
Mississippi	1	20,129	3.67	738	3.18	641	100
Missouri	60	15,943	3.71	591	3.16	504	100
Nebraska	23	15,010	3.38	508	3.08	463	100
New Hampshire	76	18,127	3.76	681	3.10	562	100
New York	91	17,906	3.58	642	3.06	548	100
North Carolina	2	16,736	3.41	570	3.10	519	100
Ohio	111	18,740	3.61	676	3.08	577	100
Oklahoma	152	16,504	3.31	546	3.04	501	100
Oregon	56	18,061	3.56	643	3.03	548	100
Pennsylvania	137	19,646	3.68	724	3.09	607	100
Rhode Island	2	17,009	4.20	714	3.25	553	100
South Dakota	109	19,344	4.20	813	3.09	598	100
Tennessee	1	15,217	3.93	598	3.07	467	100
Texas	357	17,403	3.87	673	3.22	561	100
Utah	52	14,440	3.61	522	3.11	449	100
Vermont	65	15,542	3.56	553	3.07	477	100
Virginia	14	19,738	3.72	735	3.02	596	100
Washington	110	17,123	3.54	607	3.04	521	100
West Virginia	1	14,386	3.91	562	3.11	448	100
Wisconsin	357	17,576	3.78	664	3.10	544	100
US	3,056	17,461	3.66	639	3.09	539	100

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DHI Lactation Averages for Red & White

Table 7. Red & White State and National Standardized Lactation Averages for Cows Calving in 2007 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	4	22,356	3.81	851	3.14	702	100
Arkansas	13	18,429	3.41	629	3.03	558	100
California	203	24,283	3.56	865	2.98	723	100
Colorado	12	25,660	3.22	826	3.06	784	100
Connecticut	1	21,243	3.92	832	3.07	653	100
Delaware	1	24,309	4.51	1097	3.28	797	100
Georgia	1	24,355	3.30	803	2.89	703	100
Idaho	17	26,645	3.40	905	3.19	849	100
Illinois	81	22,515	3.77	848	3.02	680	100
Indiana	4	23,529	3.73	878	3.04	716	100
Iowa	34	24,226	3.51	851	3.08	745	100
Kansas	14	20,514	3.77	773	3.19	654	100
Kentucky	25	24,008	3.84	922	3.08	741	100
Maine	1	22,765	3.74	851	3.21	730	100
Maryland	9	23,347	3.82	891	3.08	720	100
Michigan	215	24,326	3.81	926	3.01	733	100
Minnesota	273	23,086	3.72	858	2.98	688	100
Missouri	3	18,726	3.62	678	3.00	562	100
Nebraska	3	21,733	3.50	760	3.16	686	100
New Hampshire	1	29,399	3.51	1031	2.87	845	100
New York	288	23,466	3.72	874	2.98	699	100
North Carolina	13	23,740	4.01	951	3.16	750	100
North Dakota	2	25,975	3.50	909	3.00	778	100
Ohio	63	22,468	3.81	857	3.04	684	100
Oklahoma	8	19,112	3.46	662	2.95	564	100
Oregon	10	25,466	3.67	935	2.94	750	100
Pennsylvania	404	23,541	3.74	880	3.06	719	100
Puerto Rico	23	13,402	3.35	449	2.97	398	100
South Carolina	127	25,065	3.59	900	3.04	762	100
Texas	17	20,741	4.06	841	3.25	674	100
Vermont	5	20,866	3.64	760	2.97	620	100
Virginia	124	23,475	3.78	887	3.00	705	100
Washington	2	25,195	3.58	902	3.23	814	100
Wisconsin	580	24,155	3.73	901	2.98	720	100
US	2,581	23,637	3.71	878	3.01	711	100

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DHI Lactation Averages Over Time

Tables 8A-8F. Summary of National Standardized Lactation Averages

for Cows With Records Used in National Genetic Evaluations.

	Table 8A. Number of Records
	Calving Year
Breed	1980	1990	1995	2000	2001	2002	2003	2004	2005	2006	2007
Ayrshire	13,465	11,576	9,526	7,035	6,552	6,755	6,556	6,190	5,989	6,332	6,198
Brown Swiss	17,236	17,717	17,721	15,704	15,473	15,639	15,779	15,771	16,029	17,439	17,406
Guernsey	38,364	25,805	15,420	9,406	8,690	8,293	7,880	7,508	7,248	6,852	6,727
Holstein	1,109,758	1,720,127	1,769,002	1,624,058	1,588,990	1,589,782	1,564,378	1,597,548	1,650,001	1,720,541	1,793,105
Jersey	63,305	99,416	105,672	106,837	108,934	115,472	115,951	121,343	128,236	137,578	143,634
Milking Shorthorn	2,302	2,684	2,662	2,407	2,323	2,534	2,619	2,619	2,723	3,094	3,056
Red and White	900	5,588	6,281	3,927	3,578	3,334	3,002	2,756	2,636	2,665	2,581

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	Table 8B. Milk (lbs)
	Calving Year
Breed	1980	1990	1995	2000	2001	2002	2003	2004	2005	2006	2007
Ayrshire	13,144	14,799	15,684	17,389	17,878	17,880	17,738	17,885	18,303	18,232	18,220
Brown Swiss	14,172	16,250	17,493	20,300	20,694	20,869	20,715	20,757	21,405	21,413	21,533
Guernsey	11,666	13,297	14,051	16,043	16,410	16,398	16,469	16,692	17,154	17,394	17,243
Holstein	17,566	20,178	21,618	24,517	24,889	24,996	24,876	25,139	25,644	25,674	25,639
Jersey	11,437	13,407	14,842	17,038	17,472	17,663	17,612	17,732	18,087	18,159	18,265
Milking Shorthorn	11,560	14,011	15,341	16,548	17,008	17,144	17,381	17,267	17,582	17,502	17,461
Red and White	16,470	18,832	20,161	22,845	22,981	23,102	22,933	23,186	23,815	23,764	23,637

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	Table 8C. Fat (%)
	Calving Year
Breed	1980	1990	1995	2000	2001	2002	2003	2004	2005	2006	2007
Ayrshire	3.88	3.85	3.86	3.86	3.84	3.85	3.84	3.80	3.82	3.83	3.82
Brown Swiss	4.06	3.98	4.01	4.01	4.00	4.01	3.99	3.99	4.00	4.00	3.98
Guernsey	4.60	4.49	4.49	4.46	4.44	4.45	4.44	4.42	4.42	4.41	4.39
Holstein	3.61	3.61	3.64	3.64	3.63	3.65	3.65	3.64	3.65	3.66	3.65
Jersey	4.84	4.73	4.64	4.60	4.59	4.61	4.61	4.60	4.62	4.61	4.58
Milking Shorthorn	3.69	3.58	3.58	3.59	3.57	3.58	3.57	3.57	3.58	3.63	3.66
Red and White	3.62	3.67	3.68	3.66	3.65	3.65	3.65	3.63	3.63	3.69	3.71

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	Table 8D. Fat (lbs)
	Calving Year
Breed	1980	1990	1995	2000	2001	2002	2003	2004	2005	2006	2007
Ayrshire	510	570	605	671	687	689	681	680	700	698	696
Brown Swiss	576	646	701	814	827	837	827	828	856	857	856
Guernsey	536	598	630	716	728	730	731	737	758	767	757
Holstein	633	729	786	893	904	911	907	915	936	941	936
Jersey	553	634	689	784	802	814	812	815	835	838	836
Milking Shorthorn	426	502	549	595	608	614	620	616	630	636	639
Red and White	596	692	742	837	839	843	837	842	865	877	878

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	Table 8E. Protein (%)
	Calving Year
Breed	1980	1990	1995	2000	2001	2002	2003	2004	2005	2006	2007
Ayrshire		3.16	3.13	3.13	3.12	3.12	3.13	3.13	3.12	3.13	3.13
Brown Swiss		3.33	3.32	3.31	3.30	3.30	3.31	3.32	3.30	3.30	3.30
Guernsey		3.30	3.27	3.31	3.29	3.28	3.29	3.29	3.27	3.27	3.27
Holstein		2.94	2.94	3.00	3.00	3.00	3.01	3.02	3.01	3.02	3.01
Jersey		3.60	3.56	3.58	3.57	3.55	3.56	3.57	3.57	3.58	3.57
Milking Shorthorn		3.09	3.07	3.10	3.07	3.08	3.08	3.09	3.09	3.10	3.09
Red and White		2.95	2.94	2.98	2.97	2.96	2.97	2.98	2.99	3.00	3.01

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	Table 8F. Protein (lbs)
	Calving Year
Breed	1980	1990	1995	2000	2001	2002	2003	2004	2005	2006	2007
Ayrshire		468	491	545	558	558	555	560	571	570	570
Brown Swiss		541	581	672	683	688	685	688	707	707	710
Guernsey		439	460	531	540	538	541	549	561	569	563
Holstein		592	636	733	745	749	748	758	772	776	772
Jersey		482	529	610	625	628	627	633	646	650	652
Milking Shorthorn		433	471	512	522	528	535	533	543	540	539
Red and White		555	594	680	683	684	682	692	711	712	711

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