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Genetic Correlations of Milk Production and Type Traits with Somatic Cell Score from Holstein Cows in Hokkaido

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北海道の乳牛集団における体細胞スコアと産乳およ

び体型形質との遺伝相関

その他(別言語等)

のタイトル

Genetic Correlations of Milk Production and

Type Traits with Somatic Cell Score from

Holstein Cows in Hokkaido

著者

三浦 伸也, 鈴木 三義

雑誌名

日本畜産学会報

76

4

ページ

401-406

発行年

2005

URL

http://id.nii.ac.jp/1588/00000298/

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Table+. Number of records and means for type traits by parity

First parity Second parity Third parity Type traits Records Mean Records Mean Records Mean Feet & legs

Mammary system Rear leg side view Rear leg rear view

Foot angle Fore udder attachment

Rear udder height Rear udder width

Udder cleft Udder depth Front teat placement

Teat length +0.51/* +2+5,3+ +2+5,3+ +,25*/2 +2+5,3+ +2+5,3+ +2+5,3+ +2+5,3+ +2+5,3+ +2+5,3+ +2+5,3+ +1*5+/+ 1242 1341 /4, /4+ .4/ 04+ 04* /40 04* 04* .43 .41 3-5.,2 +*.5+*/ +*.5+*/ 0,5*1* +*.5+*/ +*.5+*/ +*.5+*/ +*.5+*/ +*.5+*/ +*.5+*/ +*.5+*/ 315013 2*4* 2+4-/4/ /4+ .4. 04* 04-040 04* .41 /4* /4, ,*52// -*531-++5/., -*531- ,,53--2,4+ 2-4. /40 /4. .4. 04+ 040 14-04* -42 .43 /4. »¼ῌ ½b10῍.῎:.*+ῌ.*0,,**/ .*,

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Table,. Means and SE of genetic and phenotypic correlation between milk production and somatic cell scores

Genetic correlation Phenotypic correlation

Lactation Traits Mean SE+_ Mean SE+_

First Milk yield Fat yield Protein yield SNF yield,_ *4+/ *4*3 *4+, *4+, *4*, *4*-*4*. * *. ]*4+, ]*4*+ ]*4*3 ] *4+-*4**. *4**. *4**/ *4**. Second Milk yield Fat yield Protein yield SNF yield,_ *4** ]*4*3 ]*4*2 ]*4*0 *4*, *4*/ *4*. *4*-]*4,* ]*4+/ ]*4+1 ]*4,+ *4**. *4**. *4*++ *4**. Third Milk yield Fat yield Protein yield SNF yield,_ ]*4+0 ]*4+1 ]*4,+ ]*4,, *4*/ *4*/ *4*/ *4*/ ]*4,+ ]*4+1 ]*4+2 ]*4,, *4**/ *4**/ *4**. *4**/ +_SE : Standard error.

,_SNF : Solid Not Fat.

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Table.. Heritability of type traits, genetic and phenotypic correlations between somatic cell score and type traits by parity

Heritability Genetic correlation Phenotypic correlatior

Type trais +st ,nd -rd +st ,nd -rd +st ,nd -rd

Feet & legs Mammary system Rear leg side view Rear leg rear view

Foot angle Fore udder attachmen

Rear udder height Rear udder width

Udder cleft Udder depth Front teat placement

Teat length *4+* *4++ *4+1 *4*2 *4*0 *4+/ *4+1 *4+. *4+. *4-+ *4-. *4-, *4+3 *4,1 *4,/ *4+* *4*0 *4,. *4,-*4+2 *4,/ *4.0 *4-1 *4-/ *4,* *4-* *4+3 *4*3 *4*0 *4,* *4,. *4,+ *4,-*4-/ *4-1 *4,3 *4** |*4*3 *4** |*4*/ |*4+* |*4+0 |*4*/ *4+/ *4++ |*4,3 |*4+, *4*, |*4*. |*4++ *4*3 *4*. *4*. |*4*1 *4*/ *4+3 *4*/ |*4,/ *4*+ *4*3 *4+1 |*4,* *4*, *4.* *4+1 |*4,/ |*4*0 |*4+, |*4+* |*4+3 | *4,-|*4*0 |*4*+ |*4*0 *4*+ *4** |*4*+ |*4*. | *4*-*4*, | *4*-|*4*1 |*4*+ |*4*+ |*4*+ |*4*0 *4** *4*+ *4*+ | *4*-| *4*-*4*, |*4*. |*4*0 *4** *4*+ *4** |*4*0 *4** *4** *4*, |*4*. | *4*-*4** | *4*-|*4*0 |*4*, *4*+

The genetic parameters for first and second parity were calculated from average of +*sub-datasets which divided

randomly by herd number, and the outline of data was indicated in Table+. Table-. Genetic and phenotypic correlation between

milk production at first lactation and somatic cell scores using only cows having third lactation

Correlation Traits Mean SE

Genetic Milk yield Fat yield Protein yield SNF yield+~ *4+-*4*0 *4*1 *4*3 *4*0 *4*-*4*0 *4*0 Phenotypic Milk yield Fat yield Protein yield SNF yield+~ |*4+* |*4*0 |*4*2 |*4++ *4**/ *4**-*4**0 *4**/ +~SNF : Solid Not Fat.

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(6)

!"#$ %&'( $)*+,+-./!01'2 #'34$56#7 $899:) * ;<*.-+=*..0$ >?@A!BCD E FG9HI@9#$%&' (#$J"#7 KL9:C#MN$$;<O: --9P#QKQR!S2 TU*VA WX*.+*= *.+1Y$3 Z-'[A'( -\(#9] *^O:!BC_`9(aD7 $89Z-';< O:bc9VA$3 de'KL$ 9;<@:3$J"#7 f$)* gh$ H9 ;<O:ijC#$4 MN$ :!J)k lmn39loF!pa* 8$Rq)$J"#7 rs -\9 ; <O:t3#DE r$!uC#v(w x7 9 yMN9P# $H9 z{|;<O:}E yMN+,+- jo0H$: ~$4 MN!FC#$9 !€‚ +,+-./!01 C#$'2#7 ῎ ῍ ƒ„g9(D W…Y†‡ˆ‰Š‰‹Œ9 -Ž‘9(D W…Y’“”•–— Œ9yŽ9(D ˜™3#š›! œa*DD$! 98žŸD)qC7 ῏ ῌ

Ali AKA, Shook GE.+32*. An optimum transformation for somatic cell concentration in milk. Journal of Dairy Science, 0-:

.21ῌ.3*7

DeGroot BJ, Keown JF, Van Vleck LD, Marotz EL.,**,. Genetic parameters and responses of linear type, yield traits, and somatic cell scores to divergent selection for predicted transmitting ability for type in Holsteins. Journal of Dairy Science,2/:+/12ῌ+/2/.  ¡¢£¤ῌ¥¦7 ,**07 ljo0H;<3 9- y§¨MN$:7 ’©-ª«7 W¬­zY ®¯°±ῌ¥¦ῌ²³´µῌPereira JACῌ¶·¸ῌ¹ ¡º»ῌMisztal I7 ,**,7 “”•–¼½9P#+, -MNZ-MN9:C#;<$;<O:5 Š7 ’©-ª« 1-:+ῌ2.

Haile-Mariam M, Bowman PJ, Goddard ME.,**+. Genetic and environmental correlations between Test-Day somatic cell count and milk yield traits. Livestock Production Science, 1-:+ῌ+-7

Lund T, Miglior F, Dekkers JCM, Burnside EB. +33.. Genetic relationships between clinical mastitis, somatic cell count and udder conformation in Danish Holsteins.Livestock Pro-duction Science,-3:,.-ῌ,/+

Misztal I, Tsuruta S, Strabel T, Auvray B, Druet T, Lee D.,**,. BLUPF3* and related programs (BGF3*). Proceedings of the1th World Congress on Genetics Applied to Livestock Production,2:*1.Montpellier, France, CD-ROM Communi-cation.

Mrode RA.,***. Genetic correlations of somatic cell count and conformation traits with herd life in dairy breeds, with an application to national genetic evaluations for herd life in the United Kingdom. Livestock Production Science,0/:++3ῌ +-*.

Rogers GW, Hargrove GL.+33+. Correlations among linear type traits and somatic cell counts.Journal of Dairy Science,1.: +*21ῌ+*3+.

Rupp R, Boichard D.+333. Genetic parameters for clinical mas-titis, somatic cell score, production, udder type traits, and milking ease in first lactation Holsteins. Journal of Dairy Science,2,:,+32ῌ,,*..

Schutz MM.+33.. Genetic evaluation of somatic cell scores for United States dairy cattle. Journal of Dairy Science,11: ,++-ῌ,+,3.

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Genetic Correlations of Milk Production and Type Traits with

Somatic Cell Score from Holstein Cows in Hokkaido

Shinya MIURA and Mitsuyoshi SUZUKI

Obihiro University of Agriculture and Veterinary Medicine, Obihiro-shi*2*ῌ2///, Japan

Corresponding : Mitsuyoshi SUZUKI (fax :ῌ2+(*)+//ῌ.3ῌ/.+., e-mail : mit῍obihiro.ac.jp)

Genetic correlations between somatic cell score (SCS) and other traits (milk, fat, SNF and protein yields, and type traits) were estimated using test-day records from Hokkaido Dairy Cattle Milk Recording and Testing Association and conformation records from Hokkaido Holstein Agricultural Cooperation. The numbers of records used for estimation of genetic correlation in most type traits were+2+,3+,+*.+*/, and-*31-records on first to third lactation, respectively. The bi-variate statistical model contained additive genetic e#ects and residual errors as random e#ects, and they also contained fixed e#ects for herd-test-day, age of calving, linear regression on days after calving, and Wilmilk’s function of days after calving in somatic cell score and herd-classification, age of classification, stage of lactation, and classifier in type traits. Genetic correlations estimated between SCS and milk production traits were low (fromῌ*.,,to*.+/), and were positive in the first lactation and negative in later lactations. Genetic correlations among SCS and conformation traits were also estimated. Signs of the correlations changed across the parities, most likely depending on the growth. Higher negative genetic correlations with SCS were estimated for udder depth (fromῌ*.,3toῌ*.+3) and for fore udder attachment (fromῌ*.,/toῌ*.*1). These conformation traits were associated with the lifetime production and herd life ; thus, genetic improvement of these conformation traits may reduce SCS, further increasing lifetime production.

Nihon Chikusan Gakkaiho,10(.) :.*+ῌ.*0,,**/ Key words: Somatic cell score, Genetic correlation, Type trait, Milk production, Holstein

ῐ῎ῌ῕῔

References

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