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
巻
76
号
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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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
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