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Coop erative Ext en sion New Me..: ico Slole
(The following articles taken from "Research News", U,S,D,A" Beltsville,
Maryland, March , 1977)
High Producers Milk More Rapidly
Dairymen ,",ho select cows for increased production are indirectly selecting
for cows ,",ith a higher peak flow rate. This means that though it may take a
longer time to milk out a high producer, her milking rate will be faster than
her lower producing herdmate.
Scientists at the Beltsville Agricultural Research Center in Maryland
studied peak flow rate in cows to determine if dairymen should select for this
trait. The scientists found that peak flow rate is highly heritable and that
dairymen were already indirectly improvi ng this trait in their cows by selecting
for high milk production.
AI Sires Improve Cow Production
Recently , the use of genetically superior sires has contributed more to
increased milk and fat production than improved management, according to a study
of over 3,6 million records of first lactation dairy cows calving between 1960
and mid-1975 . Six dairy breeds were represented in the study conducted by the
Agricultural Research Service (ARS) , Most of the genetic improvement resulted
from the use of AI sires. In 1974, the last compl ete year for which data were
available , the superior genetic transmitting ability of AI sires over non-AI
sires was 352 lbs in Ayrshires. 253 Ibs in Guernseys , 560 Ibs in Milking
Shorthorns; Holsteins and Jerseys are not included in this research report.
These data were based on the genetic merit of the sires of first-lactation
cows that calved each year in the Official DHI Plan .
During the first years of the study, better management played the major
role in increasing production, However, in the last few years, the use of
genetically superior sires, particularly AI sires, bas consistently surpassed
management in increasing milk and fat yield.
With improved genetic evaluation procedures, ARS scientists say, they
expect the use of superior breeding stock to continue to be important as a
means f or increasing production in dairy herds,
New Muico 5 •• 1. Unl ..... hy it In tquII <>PfJOnum.y 1"'fIloy • •. All p.r~"m. If" IV. ,lobil '0 .... ryo"'" ft>ga,dl .... 01 ''''''.
color. 0' nilionol orIgin. Now M. ~ico 51 ... Unl ... "l,y ofld Ihl U.S. Dlp'",nenl 01 Agficul!ufI coo_oling.
Object Description
| Title | Dairy Herd Improvement Notes, April, 1977 |
| Series Designation | Dairy Herd Improvement Association Monthly Report |
| Description | The monthly report of the Dairy Herd Improvement Association (DHIA) was initiated by E.E. Anderson, Extension Dairyman in the 1940s. From the 1960s forward a cooperative report had been prepared jointly by staff members of the NMSU Dairy Department, Agricultural Engineering, Agronomy, Veterinary and sent primarily to dairy herds on test (OS, DHIA, DHIR), County Extension Agents, and Instructors of Vocational Agriculture. The publication of the DHIA report was overseen by Philip Leyendecker, a director of the NMSU Agricultural Extension Service in cooperation with U.S. Department of Agriculture. The title of the report had changed over time; it had a couple of variations, New Mexico Dairy Herd Improvement and Dairy Improvement Notes. This digital collection includes historical issues published between 1961 and 1980. |
| Subject | dairy cattle (NAL); dairy farming (NAL); dairy industry (NAL); Dairy cattle--New Mexico; Dairying--New Mexico; Dairy cattle--New Mexico--Periodicals; Milk and milk products; |
| Creator | Ells, Borden; |
| Date Original | 1977-04 |
| Digital Publisher | New Mexico State University Library |
| Rights | Copyright, NMSU Board of Regents |
| Collection | NMSU Cooperative Extension Service and Agricultural Experiment Station Publications |
| Digital Identifier | UAAPdhi197704 |
| Source | Call number J87.N6 X313.99 D13; http://libcat.nmsu.edu/vwebv/holdingsInfo?bibId=556737 |
| OCLC number | 35302385 |
| Type | Text |
| Format | application/pdf |
| Language | eng |
Page Description
| Title | High Producers Milk More Rapidly; AI Sires Improve Cow Production |
| Series Designation | Dairy Herd Improvement Association Monthly Report |
| OCR | • Coop erative Ext en sion New Me..: ico Slole (The following articles taken from "Research News", U,S,D,A" Beltsville, Maryland, March , 1977) High Producers Milk More Rapidly Dairymen ",ho select cows for increased production are indirectly selecting for cows ",ith a higher peak flow rate. This means that though it may take a longer time to milk out a high producer, her milking rate will be faster than her lower producing herdmate. Scientists at the Beltsville Agricultural Research Center in Maryland studied peak flow rate in cows to determine if dairymen should select for this trait. The scientists found that peak flow rate is highly heritable and that dairymen were already indirectly improvi ng this trait in their cows by selecting for high milk production. AI Sires Improve Cow Production Recently , the use of genetically superior sires has contributed more to increased milk and fat production than improved management, according to a study of over 3,6 million records of first lactation dairy cows calving between 1960 and mid-1975 . Six dairy breeds were represented in the study conducted by the Agricultural Research Service (ARS) , Most of the genetic improvement resulted from the use of AI sires. In 1974, the last compl ete year for which data were available , the superior genetic transmitting ability of AI sires over non-AI sires was 352 lbs in Ayrshires. 253 Ibs in Guernseys , 560 Ibs in Milking Shorthorns; Holsteins and Jerseys are not included in this research report. These data were based on the genetic merit of the sires of first-lactation cows that calved each year in the Official DHI Plan . During the first years of the study, better management played the major role in increasing production, However, in the last few years, the use of genetically superior sires, particularly AI sires, bas consistently surpassed management in increasing milk and fat yield. With improved genetic evaluation procedures, ARS scientists say, they expect the use of superior breeding stock to continue to be important as a means f or increasing production in dairy herds, New Muico 5 •• 1. Unl ..... hy it In tquII <>PfJOnum.y 1"'fIloy • •. All p.r~"m. If" IV. ,lobil '0 .... ryo"'" ft>ga,dl .... 01 ''''''. color. 0' nilionol orIgin. Now M. ~ico 51 ... Unl ... "l,y ofld Ihl U.S. Dlp'",nenl 01 Agficul!ufI coo_oling. |
