State and National Standardized Lactation Averages by Breed

AIPL RESEARCH REPORT
K2-04 (3-06)

State and National Standardized Lactation Averages by Breed for Cows Calving in 2004

H.D. Norman and L.L.M. Thornton
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

Standardized lactation yields have been used to compare dairy cows having different lactation characteristics (i.e., age at calving, days milked, milking frequency, etc.) in an equitable manner. Average of standardized yield is compared in this report for each State and the nation for calvings in 2004 by breed. The data available originated in herds enrolled in the Dairy Herd Improvement (DHI) Program. The test-day data, used by the Animal Improvement Programs Laboratory to determine lactation records, are processed and provided by the dairy records processing centers (DRPC). DHI participation and DRPC activity have also been summarized using the same data source.

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

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. This change was responsible for a portion of the increases in yields observed between 1996 and 1997 because the current method gives a more favorable prediction for the lower producing cows. Protein testing for records contributing to genetic evaluations is at or near 100% except in California (87% for Guernseys, 88% for Holsteins, and 83% for Red and Whites) and Nevada (85% for Holsteins). Component percentages were computed from averages of standardized yields for milk and components.

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. Numbers of records and national averages are in Tables 8A-8F by breed for selected years.

Breed yields are different between this report and the herd-average report because this report summarizes standardized lactation yield, whereas the herd-average report is determined from actual herd yields. Records contributing to herd-averages are not restricted to those usable for national genetic evaluations. Herd-average report is impacted also by the length of 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, herd-average reports tend to be more current (about 6 mo) than standardized yield published at the same time.

Ayrshire calvings were down 5.6% from last year, falling below the previous low set in 2001. Calvings for Ayrshires, Guernsey, and Red and Whites declined in 2004, dropping 5.6%, 4.7%, and 8.0%, respectively from the previous year. Numbers have declined steadily in the latter two breeds falling by nearly 50% since 1995. Jersey calvings increased 4.7% for 2004, picking up their earlier trend after experiencing little growth in 2003. Holstein calvings were up 2.1% over 2003 and 0.5% over 2002.

Milk yield increased slightly for all breeds except Milking Shorthorn, but differences from last year were 1% or less. While fat % was down slightly (<1%), higher milk production balanced fat production. Protein % remained at 2003 levels, thus protein production increased slightly. While feed availability and operating costs, milk and beef prices, Government programs, and characteristics of herds entering and leaving eligible testing programs can affect production averages in either direction, genetic change continues to have a positive effect on yield. The leveling off of average yields most likely reflects changes in management strategies due to feed availability and somewhat more emphasis on other traits such as health and longevity. For instance, average somatic cell count during 2004 was below 300,000 cells/ml for the first time in 10 years (Herd somatic cell count report). Interpretation of trends in lactation averages should be made in view of other changes affecting profitability.

DHI Lactation Averages for Ayrshire

Table 1. Ayrshire State and National Standardized Lactation Averages for Cows Calving in 2004 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	3	15,018	3.36	505	3.11	468	100
Arkansas	26	17,663	3.52	622	3.10	547	100
California	25	22,714	3.85	874	3.14	714	100
Colorado	9	18,788	3.64	685	3.10	583	100
Connecticut	112	19,213	3.99	767	3.27	628	100
Delaware	4	16,804	4.07	684	3.23	543	100
Florida	5	15,355	3.70	568	3.18	488	100
Idaho	1	14,261	4.14	590	3.10	442	100
Illinois	234	18,231	3.66	667	3.15	573	100
Indiana	64	16,514	3.88	641	3.21	530	100
Iowa	569	19,410	3.73	725	3.14	610	100
Kansas	65	17,081	3.67	628	3.18	544	100
Kentucky	74	15,190	3.62	549	3.19	484	100
Louisiana	11	15,531	3.80	590	3.15	488	100
Maine	125	17,121	3.72	638	3.00	514	100
Maryland	321	20,253	3.94	798	3.12	632	100
Massachusetts	13	18,030	4.01	722	3.23	583	100
Michigan	56	20,894	3.84	803	3.10	648	100
Minnesota	180	17,481	3.89	679	3.08	538	100
Missouri	82	15,608	3.76	587	3.10	484	100
Nebraska	77	16,777	3.77	633	3.11	522	100
New Hampshire	136	19,617	3.62	710	3.16	620	100
New Jersey	8	18,690	4.27	797	3.10	579	100
New Mexico	242	14,259	3.79	541	3.14	448	100
New York	1,113	17,371	3.84	666	3.09	536	100
North Carolina	73	13,021	4.24	551	3.05	397	100
North Dakota	7	19,252	3.76	724	3.16	607	100
Ohio	437	18,233	3.71	677	3.13	571	100
Oklahoma	84	22,881	3.41	780	3.09	707	100
Oregon	31	17,269	3.78	653	3.10	535	100
Pennsylvania	890	17,956	3.82	687	3.14	563	100
Rhode Island	21	14,690	3.96	581	3.14	461	100
South Carolina	5	19,377	3.87	751	3.15	611	100
Tennessee	40	15,064	3.79	571	3.13	472	100
Texas	102	19,242	3.91	752	3.33	641	100
Utah	20	13,987	4.03	564	3.25	455	100
Vermont	375	17,801	3.85	686	3.15	561	100
Virginia	49	15,694	3.60	566	3.11	488	100
Washington	12	18,542	3.65	677	3.20	593	100
West Virginia	30	16,958	3.75	636	3.15	534	100
Wisconsin	459	17,650	3.84	677	3.13	552	100
US	6,190	17,885	3.80	680	3.13	560	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 2004 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	5	20,069	3.66	735	3.08	618	100
Arizona	102	21,466	3.90	837	3.18	682	100
Arkansas	141	17,874	3.69	659	3.31	592	100
California	437	21,271	3.90	829	3.34	709	98
Colorado	57	23,166	4.04	935	3.30	765	100
Connecticut	54	20,392	3.99	814	3.34	682	100
Delaware	13	17,649	4.36	770	3.45	609	100
Florida	17	20,250	3.81	771	3.29	666	100
Georgia	84	19,663	3.92	771	3.31	651	100
Idaho	195	21,836	3.88	847	3.43	749	100
Illinois	547	21,651	4.00	867	3.33	720	100
Indiana	468	22,539	4.10	925	3.36	756	100
Iowa	1,460	21,337	4.02	858	3.35	714	100
Kansas	216	23,136	3.74	866	3.35	776	100
Kentucky	117	19,080	3.77	720	3.29	627	100
Louisiana	27	15,806	3.48	550	3.22	509	100
Maine	30	16,526	3.80	629	3.34	552	100
Maryland	359	21,535	3.91	843	3.29	708	100
Massachusetts	107	21,117	3.81	805	3.35	708	100
Michigan	307	23,869	4.01	957	3.29	785	100
Minnesota	1,271	20,765	4.08	846	3.29	683	100
Mississippi	7	17,276	3.57	616	3.00	519	100
Missouri	371	19,944	4.00	797	3.38	673	100
Nebraska	211	21,253	3.93	835	3.26	693	100
New Hampshire	106	17,490	3.88	678	3.31	579	100
New Jersey	6	19,169	4.44	851	3.26	625	100
New Mexico	13	19,021	3.82	727	3.36	640	100
New York	953	19,777	4.00	791	3.28	649	100
North Carolina	56	19,537	4.11	803	3.29	642	100
North Dakota	73	18,555	3.97	737	3.38	626	100
Ohio	1,488	21,109	3.98	841	3.31	699	100
Oklahoma	106	17,913	3.74	670	3.28	588	100
Oregon	207	21,622	3.99	862	3.31	717	100
Pennsylvania	1,373	20,092	3.93	790	3.30	662	100
Puerto Rico	89	14,167	3.19	451	3.31	469	100
South Carolina	8	21,300	3.72	793	3.18	677	100
South Dakota	193	19,276	4.31	831	3.38	651	100
Tennessee	302	17,984	3.96	712	3.26	586	100
Texas	482	19,589	3.97	779	3.33	653	100
Utah	94	16,849	4.39	739	3.39	571	100
Vermont	332	19,419	4.08	792	3.34	648	100
Virginia	155	21,825	3.70	808	3.29	718	100
Washington	221	21,287	3.86	822	3.40	724	100
West Virginia	9	18,311	4.01	735	3.46	634	100
Wisconsin	2,902	21,279	4.05	861	3.31	704	100
US	15,771	20,757	3.99	828	3.32	688	>99

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DHI Lactation Averages for Guernsey

Table 3. Guernsey State and National Standardized Lactation Averages for Cows Calving in 2004 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	1	21,119	3.56	752	3.03	639	100
Arizona	20	20,373	4.06	827	3.10	632	100
Arkansas	17	15,205	4.02	612	3.39	515	100
California	395	18,638	4.35	812	3.38	644	87
Colorado	5	16,103	4.16	670	3.19	514	100
Connecticut	41	16,996	4.34	738	3.31	563	100
Delaware	3	17,973	3.79	681	3.11	560	100
Florida	24	16,131	4.30	693	3.24	523	100
Georgia	9	17,153	3.52	604	3.26	559	100
Idaho	15	16,117	4.28	691	3.39	547	100
Illinois	184	16,895	4.43	748	3.22	544	100
Indiana	298	17,076	4.38	747	3.32	567	100
Iowa	586	18,231	4.40	803	3.27	596	100
Kansas	52	17,150	4.29	736	3.30	565	100
Kentucky	23	18,467	4.10	758	3.24	599	100
Louisiana	43	14,747	4.36	642	3.35	493	100
Maine	36	15,043	4.68	704	3.39	510	100
Maryland	326	16,350	4.56	746	3.34	546	100
Massachusetts	10	14,793	4.63	685	3.36	498	100
Michigan	27	15,352	4.12	632	3.15	484	100
Minnesota	377	15,157	4.51	683	3.27	496	100
Mississippi	1	15,054	3.83	577	2.99	450	100
Missouri	326	15,237	4.31	657	3.36	512	100
Nebraska	73	18,517	4.46	826	3.24	600	100
New Hampshire	10	17,202	4.20	722	3.21	552	100
New Jersey	2	21,115	5.17	1091	3.14	663	100
New York	455	15,888	4.45	707	3.22	511	100
North Carolina	39	16,623	4.45	739	3.27	544	100
North Dakota	1	21,420	3.84	822	3.11	666	100
Ohio	263	16,960	4.39	744	3.35	568	100
Oklahoma	86	14,754	4.02	593	3.23	476	100
Oregon	351	18,183	4.44	807	3.30	600	100
Pennsylvania	776	15,918	4.33	690	3.26	519	100
South Carolina	47	15,943	4.27	681	3.30	527	100
South Dakota	58	13,464	4.28	577	3.22	434	100
Tennessee	92	17,202	4.20	723	3.16	543	100
Texas	91	16,501	4.10	677	3.17	523	100
Utah	3	20,322	4.12	838	3.11	633	100
Vermont	170	15,538	4.45	692	3.29	512	100
Virginia	131	14,538	4.37	636	3.22	468	100
Washington	143	17,791	4.46	793	3.29	586	100
West Virginia	15	15,333	4.56	700	3.45	529	100
Wisconsin	1,883	16,872	4.51	761	3.30	556	100
US	7,508	16,692	4.42	737	3.29	549	99

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DHI Lactation Averages for Holstein

Table 4. Holstein State and National Standardized Lactation Averages for Cows Calving in 2004 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	1,161	21,904	3.41	747	2.97	650	100
Arizona	18,897	24,548	3.50	860	2.95	725	>99
Arkansas	1,505	21,776	3.47	755	3.01	655	100
California	352231	26,272	3.60	947	3.06	804	88
Colorado	11,650	26,132	3.61	943	3.05	796	100
Connecticut	6,510	24,951	3.55	886	3.02	754	100
Delaware	2,424	24,113	3.68	887	3.01	727	100
Florida	7,247	23,699	3.62	857	3.01	714	>99
Georgia	8,209	22,975	3.52	808	2.98	685	100
Idaho	36,477	26,382	3.56	939	3.06	809	>99
Illinois	24,855	24,586	3.61	887	3.00	737	>99
Indiana	15,707	24,376	3.70	901	2.99	730	>99
Iowa	43,439	25,120	3.64	914	3.02	759	>99
Kansas	10,919	24,286	3.61	877	3.03	737	>99
Kentucky	6,739	23,175	3.53	819	3.00	696	100
Louisiana	2,606	20,680	3.45	713	2.98	617	>99
Maine	5,890	24,293	3.72	904	3.03	737	100
Maryland	19,830	23,706	3.73	884	3.02	717	100
Massachusetts	4,966	25,373	3.63	922	3.03	768	100
Michigan	57,104	26,407	3.76	992	2.99	789	100
Minnesota	118557	24,431	3.70	905	3.00	732	>99
Mississippi	3,213	23,072	3.51	811	2.94	677	100
Missouri	10,591	22,630	3.59	812	3.03	686	>99
Montana	2,527	25,635	3.54	907	2.97	762	100
Nebraska	9,474	24,456	3.66	894	3.02	739	>99
Nevada	3,429	25,948	3.57	925	3.13	807	85
New Hampshire	5,905	26,323	3.64	958	3.03	798	100
New Jersey	3,841	24,686	3.80	939	3.00	741	100
New Mexico	12,047	24,751	3.46	857	3.02	748	100
New York	162531	24,364	3.66	891	3.00	731	>99
North Carolina	11,301	24,014	3.57	856	2.98	717	100
North Dakota	2,462	24,328	3.71	903	3.01	733	100
Ohio	43,892	24,286	3.64	884	3.02	734	>99
Oklahoma	3,918	22,719	3.35	760	3.00	681	100
Oregon	17,690	25,785	3.72	959	3.05	788	>99
Pennsylvania	164318	24,362	3.59	875	3.00	731	>99
Puerto Rico	2,917	14,344	3.03	435	3.00	430	100
Rhode Island	140	24,679	3.59	887	3.06	755	100
South Carolina	4,899	23,687	3.56	844	2.97	705	>99
South Dakota	7,019	24,070	3.67	884	3.01	724	>99
Tennessee	8,023	23,153	3.60	834	2.96	686	100
Texas	20,402	24,044	3.64	875	3.06	735	>99
Utah	12,988	25,789	3.59	925	3.02	778	100
Vermont	25,834	24,741	3.69	912	3.04	751	>99
Virginia	32,305	24,063	3.54	852	2.97	716	100
Washington	32,289	26,039	3.67	954	3.03	790	100
West Virginia	2,933	22,536	3.67	828	3.01	679	>99
Wisconsin	233365	25,731	3.71	955	3.00	772	>99
Wyoming	372	26,820	3.80	1018	2.91	780	100
US	1.6E6	25,139	3.64	915	3.02	758	97

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DHI Lactation Averages for Jersey

Table 5. Jersey State and National Standardized Lactation Averages for Cows Calving in 2004 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	1,530	16,143	4.47	722	3.58	578	100
Arizona	5,602	17,309	4.57	792	3.43	594	100
Arkansas	333	15,712	4.20	660	3.59	564	100
California	38,095	18,960	4.60	873	3.60	683	99
Colorado	249	18,439	4.58	844	3.51	648	100
Connecticut	426	17,307	4.61	798	3.56	616	100
Delaware	60	18,099	4.72	854	3.45	624	100
Florida	181	16,889	4.47	755	3.48	588	100
Georgia	421	15,538	4.23	657	3.48	540	100
Idaho	3,323	17,900	4.70	841	3.70	663	100
Illinois	1,171	16,504	4.56	752	3.56	587	100
Indiana	995	17,392	4.56	792	3.56	620	100
Iowa	3,064	17,935	4.66	837	3.58	642	100
Kansas	1,089	17,190	4.45	765	3.53	606	100
Kentucky	991	15,223	4.34	660	3.54	539	100
Louisiana	280	14,755	3.87	572	3.45	509	100
Maine	643	16,967	4.77	809	3.56	605	100
Maryland	1,018	16,985	4.69	797	3.61	613	100
Massachusetts	711	17,346	4.68	812	3.56	618	100
Michigan	1,296	16,562	4.74	785	3.60	595	100
Minnesota	2,169	16,511	4.67	771	3.55	586	100
Mississippi	613	16,721	4.29	718	3.46	579	100
Missouri	1,448	15,860	4.55	721	3.59	569	100
Montana	5	17,167	4.57	785	3.60	618	100
Nebraska	345	19,229	4.44	854	3.61	694	100
Nevada	340	17,240	4.69	808	3.52	608	100
New Hampshire	558	17,717	4.64	822	3.62	642	100
New Jersey	62	16,856	5.38	907	3.61	609	100
New Mexico	1,171	16,774	4.62	775	3.50	586	>99
New York	5,576	17,327	4.61	799	3.52	609	100
North Carolina	2,177	19,154	4.41	845	3.51	672	100
North Dakota	48	16,349	4.44	725	3.61	590	100
Ohio	6,601	17,480	4.67	816	3.60	629	100
Oklahoma	460	16,408	4.32	709	3.56	584	100
Oregon	7,357	18,387	4.62	849	3.58	658	>99
Pennsylvania	6,852	16,539	4.61	762	3.54	586	100
Puerto Rico	63	12,597	3.54	446	3.59	453	100
Rhode Island	4	18,926	4.51	854	3.58	678	100
South Carolina	2,157	17,686	4.50	796	3.46	611	>99
South Dakota	350	18,235	5.02	915	3.50	639	100
Tennessee	1,948	16,940	4.51	764	3.49	591	100
Texas	5,014	15,683	4.48	702	3.57	560	100
Utah	1,067	17,590	4.55	801	3.58	629	100
Vermont	2,705	15,972	4.70	750	3.58	571	100
Virginia	1,112	16,967	4.57	775	3.55	602	100
Washington	2,276	17,562	4.50	790	3.61	633	100
West Virginia	280	18,193	4.43	806	3.72	676	100
Wisconsin	7,107	17,322	4.69	813	3.58	619	100
US	121343	17,732	4.60	815	3.57	633	>99

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DHI Lactation Averages for Milking Shorthorn

Table 6. Milking Shorthorn State and National Standardized Lactation Averages for Cows Calving in 2004 With
Records Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Arizona	279	13,418	3.57	479	3.01	403	100
Arkansas	48	19,665	3.52	692	3.12	613	100
California	170	19,084	3.40	649	3.08	587	99
Colorado	4	21,274	4.20	894	3.25	691	100
Connecticut	4	16,051	3.82	614	2.98	478	100
Idaho	91	19,929	3.41	680	3.17	632	100
Illinois	43	18,112	3.27	593	3.14	568	100
Indiana	22	17,916	3.55	636	3.04	544	100
Iowa	101	16,186	3.62	586	3.02	489	100
Kansas	47	20,216	3.39	685	3.19	644	100
Maine	24	16,726	3.52	589	3.07	513	100
Maryland	22	14,893	3.80	566	3.23	481	100
Massachusetts	8	17,894	3.38	605	2.97	531	100
Michigan	6	18,519	3.52	651	3.06	566	100
Minnesota	476	17,380	3.71	645	3.10	539	100
Missouri	54	16,182	3.50	567	3.11	503	100
Nebraska	18	16,226	3.61	586	3.21	521	100
New Hampshire	73	17,967	3.60	647	3.04	546	100
New York	80	18,061	3.46	624	3.01	543	100
North Carolina	7	19,322	3.74	723	3.30	638	100
North Dakota	7	17,142	3.86	662	3.19	547	100
Ohio	70	14,285	3.29	470	3.06	437	100
Oklahoma	180	16,443	3.31	545	3.06	504	100
Oregon	49	19,043	3.37	641	3.03	576	100
Pennsylvania	92	17,716	3.72	658	3.08	546	100
South Dakota	40	15,250	3.62	552	3.14	478	100
Texas	116	19,489	3.67	716	3.26	636	100
Utah	40	14,581	3.68	537	3.22	469	100
Vermont	62	15,386	3.61	556	3.08	474	100
Virginia	16	18,486	3.69	682	3.17	585	100
Washington	119	20,047	3.52	706	3.07	616	100
Wisconsin	251	18,026	3.74	673	3.06	552	100
US	2,619	17,267	3.57	616	3.09	533	>99

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DHI Lactation Averages for Red & White

Table 7. Red & White State and National Standardized Lactation Averages for Cows Calving in 2004 With Records
Used in National Genetic Evaluations.

	Records	Milk	Fat		Protein
State	(no.)	(lb)	(%)	(lb)	(%)	(lb)	Reporting
Alabama	2	23,089	3.35	774	3.07	709	100
Arkansas	8	20,080	3.35	673	2.99	600	100
California	215	23,407	3.60	843	3.05	710	83
Colorado	16	23,623	3.34	790	2.92	689	100
Connecticut	3	27,225	3.18	866	2.83	772	100
Georgia	1	21,534	3.67	790	2.91	626	100
Idaho	17	26,277	3.31	871	3.14	825	100
Illinois	72	23,801	3.75	892	2.95	702	100
Indiana	6	23,651	4.50	1065	3.05	721	100
Iowa	28	25,610	3.65	935	2.99	766	100
Kansas	12	20,789	3.55	739	3.22	669	100
Kentucky	26	22,231	3.81	848	3.12	693	100
Maine	3	21,252	3.47	737	2.69	573	100
Maryland	9	22,515	3.68	830	2.89	652	100
Massachusetts	3	22,277	3.48	774	2.97	661	100
Michigan	309	25,283	3.71	939	3.02	765	100
Minnesota	359	22,845	3.68	840	2.95	675	100
Mississippi	1	12,924	3.98	514	2.86	369	100
Missouri	5	18,443	3.71	684	3.07	566	100
Nebraska	3	23,085	3.41	786	3.05	705	100
New Hampshire	3	30,564	3.36	1027	2.90	887	100
New Jersey	3	21,314	3.92	835	2.95	629	100
New Mexico	1	21,978	3.65	802	3.02	663	100
New York	331	22,504	3.66	823	2.96	667	100
North Carolina	7	22,070	3.54	781	3.01	665	100
North Dakota	9	25,513	3.41	870	2.98	761	100
Ohio	39	21,036	3.75	788	3.04	640	100
Oklahoma	3	19,420	3.50	679	3.14	610	100
Oregon	11	23,870	3.85	919	2.99	714	100
Pennsylvania	313	22,530	3.67	827	2.99	675	100
Puerto Rico	46	13,373	3.32	443	2.89	387	100
South Carolina	103	26,402	3.35	884	3.06	809	100
Texas	2	19,683	3.65	719	3.35	660	100
Vermont	11	19,262	3.67	707	2.88	554	100
Virginia	178	22,659	3.49	792	2.98	676	100
Washington	5	28,353	3.56	1008	2.82	800	100
Wisconsin	593	23,351	3.64	851	2.95	688	100
US	2,756	23,186	3.63	842	2.98	692	99

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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	1996	1997	1998	1999	2000	2001	2002	2003	2004
Ayrshire	13,465	11,576	9,526	8,824	8,176	7,617	7,399	7,035	6,552	6,755	6,556	6,190
Brown Swiss	17,236	17,717	17,721	16,977	16,245	15,499	15,677	15,704	15,473	15,639	15,779	15,771
Guernsey	38,364	25,805	15,420	13,454	11,944	10,796	10,273	9,406	8,690	8,293	7,880	7,508
Holstein	1,109,758	1,720,127	1,769,002	1,722,958	1,701,669	1,641,948	1,668,927	1,624,058	1,588,990	1,589,782	1,564,378	1,597,548
Jersey	63,305	99,416	105,672	102,559	100,213	99,853	104,460	106,837	108,934	115,472	115,951	121,343
Milking Shorthorn	2,302	2,684	2,662	2,483	2,445	2,326	2,436	2,407	2,323	2,534	2,619	2,619
Red and White	900	5,588	6,281	5,673	5,242	4,595	4,297	3,927	3,578	3,334	3,002	2,756

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	Table 8B. Milk (lbs)
	Calving Year
Breed	1980	1990	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Ayrshire	13,144	14,799	15,684	15,647	16,611	16,932	17,424	17,389	17,878	17,880	17,738	17,885
Brown Swiss	14,172	16,250	17,493	17,818	18,782	19,386	20,148	20,300	20,694	20,869	20,715	20,757
Guernsey	11,666	13,297	14,051	14,177	15,132	15,546	15,963	16,043	16,410	16,398	16,469	16,692
Holstein	17,566	20,178	21,618	21,926	23,143	23,675	24,380	24,517	24,889	24,996	24,876	25,139
Jersey	11,437	13,407	14,842	15,097	15,838	16,294	16,940	17,038	17,472	17,663	17,612	17,732
Milking Shorthorn	11,560	14,011	15,341	15,464	16,007	16,109	16,704	16,548	17,008	17,144	17,381	17,267
Red and White	16,470	18,832	20,161	20,310	21,423	22,019	22,732	22,845	22,981	23,102	22,933	23,186

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	Table 8C. Fat (%)
	Calving Year
Breed	1980	1990	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Ayrshire	3.88	3.85	3.86	3.86	3.86	3.86	3.87	3.86	3.84	3.85	3.84	3.80
Brown Swiss	4.06	3.98	4.01	4.01	4.01	3.98	4.01	4.01	4.00	4.01	3.99	3.99
Guernsey	4.60	4.49	4.49	4.48	4.47	4.44	4.47	4.46	4.44	4.45	4.44	4.42
Holstein	3.61	3.61	3.64	3.63	3.62	3.63	3.65	3.64	3.63	3.65	3.65	3.64
Jersey	4.84	4.73	4.64	4.64	4.64	4.62	4.61	4.60	4.59	4.61	4.61	4.60
Milking Shorthorn	3.69	3.58	3.58	3.58	3.59	3.55	3.57	3.59	3.57	3.58	3.57	3.57
Red and White	3.62	3.67	3.68	3.69	3.66	3.64	3.64	3.66	3.65	3.65	3.65	3.63

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	Table 8D. Fat (lbs)
	Calving Year
Breed	1980	1990	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Ayrshire	510	570	605	605	642	653	674	671	687	689	681	680
Brown Swiss	576	646	701	715	752	771	807	814	827	837	827	828
Guernsey	536	598	630	635	676	690	713	716	728	730	731	737
Holstein	633	729	786	798	838	859	890	893	904	911	907	915
Jersey	553	634	689	700	734	753	781	784	802	814	812	815
Milking Shorthorn	426	502	549	554	574	572	596	595	608	614	620	616
Red and White	596	692	742	750	785	801	828	837	839	843	837	842

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	Table 8E. Protein (%)
	Calving Year
Breed	1980	1990	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Ayrshire		3.16	3.13	3.13	3.12	3.11	3.13	3.13	3.12	3.12	3.13	3.13
Brown Swiss		3.33	3.32	3.32	3.32	3.30	3.31	3.31	3.30	3.30	3.31	3.32
Guernsey		3.30	3.27	3.29	3.30	3.29	3.31	3.31	3.29	3.28	3.29	3.29
Holstein		2.94	2.94	2.94	2.96	2.96	2.99	3.00	3.00	3.00	3.01	3.02
Jersey		3.60	3.56	3.56	3.55	3.55	3.57	3.58	3.57	3.55	3.56	3.57
Milking Shorthorn		3.09	3.07	3.06	3.07	3.06	3.09	3.10	3.07	3.08	3.08	3.09
Red and White		2.95	2.94	2.95	2.97	2.96	2.97	2.98	2.97	2.96	2.97	2.98

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	Table 8F. Protein (lbs)
	Calving Year
Breed	1980	1990	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Ayrshire		468	491	490	518	527	545	545	558	558	555	560
Brown Swiss		541	581	592	623	639	667	672	683	688	685	688
Guernsey		439	460	466	499	511	528	531	540	538	541	549
Holstein		592	636	646	683	701	727	733	745	749	748	758
Jersey		482	529	537	562	579	605	610	625	628	627	633
Milking Shorthorn		433	471	474	492	493	516	512	522	528	535	533
Red and White		555	594	599	637	650	675	680	683	684	682	692

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