ESTIMATION OF GENETIC AND ENVIRONMENTAL VARIANCES FOR FAT YIELD IN INDIVIDUAL HERDS AND AN INVESTIGATION INTO HETEROGENEITY OF VARIANCE BETWEEN HERDS

被引：50

作者：

VISSCHER, PM ^{[1
]}

THOMPSON, R ^{[1
]}

HILL, WG ^{[1
]}

机构：

[1] AFRC, INST ANIM PHYSIOL & GENET RES, ROSLIN EH25 9PS, MIDLOTHIAN, SCOTLAND

来源：

LIVESTOCK PRODUCTION SCIENCE | 1991年 / 28卷 / 04期

关键词：

DAIRY CATTLE; ANIMAL MODEL; HERITABILITIES; HETEROGENEITY OF VARIANCE; MAXIMUM LIKELIHOOD;

D O I：

10.1016/0301-6226(91)90010-N

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Genetic and environmental variances for fat yield were estimated for 26 large Holstein Friesian pedigree herds in the UK, using an Animal Model (AM). Individual herd heritability estimates ranged from 0.03 to 0.80, but a single test against the combined herd estimate (0.379) was not significant (P > 0.05). Testing variance estimates for each herd at a constant heritability resulted in highly significant heterogeneous (phenotypic) variance estimates. A quadratic approximation of the likelihood surface at the maximum likelihood estimates seemed to over-estimate (log) likelihood differences when testing different parameter values. Three different transformations of the data to reduce the heterogeneity of variance were tried. Pre-adjustment for the within-herd or herd-year-season phenotypic variance was most effective in reducing heterogeneity of variance, and seems the most practical way to deal with heterogeneity of variance for an AM genetic evaluation.

引用

页码：273 / 290

页数：18

共 29 条

[1]

Boldman K. G., 1988, J DAIRY SCI S2, V71, P81, DOI [DOI 10.1016/S0022-0302(88)79982-8, 10.1016/S0022-0302(88)79982-8]

[2] HETEROGENEITY OF VARIANCE AMONGST HERDS FOR MILK-PRODUCTION [J].

BROTHERSTONE, S ;

HILL, WG .

ANIMAL PRODUCTION, 1986, 42 :297-303

[3] COMPONENTS OF ENVIRONMENTAL VARIANCE OF YIELDS OF COWS IN DIFFERENT LACTATIONS [J].

BROTHERSTONE, S ;

HILL, WG ;

THOMPSON, R .

ANIMAL PRODUCTION, 1989, 48 :283-291

[4]

Fisher R. A., 1956, STATISTICAL METHODS

[5] ON SELECTION CRITERIA AND ESTIMATION OF PARAMETERS WHEN THE VARIANCE IS HETEROGENEOUS [J].

GIANOLA, D .

THEORETICAL AND APPLIED GENETICS, 1986, 72 (05) :671-677

[6] A DERIVATIVE-FREE APPROACH FOR ESTIMATING VARIANCE-COMPONENTS IN ANIMAL-MODELS BY RESTRICTED MAXIMUM-LIKELIHOOD [J].

GRASER, HU ;

SMITH, SP ;

TIER, B .

JOURNAL OF ANIMAL SCIENCE, 1987, 64 (05) :1362-1370

[7]

HARVILLE DA, 1977, J AM STAT ASSOC, V72, P320, DOI 10.2307/2286796

[8]

Henderson C. R., 1973, Proceedings of the Animal Breeding and Genetics Symposium in honor of Dr. Jay L. Lush, held July 29, 1972, at Virginia Polytechnic Institute and State University, Blacksburg, Virginia., P10

[9] HERITABILITY OF MILK-YIELD AND COMPOSITION AT DIFFERENT LEVELS AND VARIABILITY OF PRODUCTION [J].

HILL, WG ;

EDWARDS, MR ;

AHMED, MKA ;

THOMPSON, R .

ANIMAL PRODUCTION, 1983, 36 (FEB) :59-68

[10] ON SELECTION AMONG GROUPS WITH HETEROGENEOUS VARIANCE [J].

HILL, WG .

ANIMAL PRODUCTION, 1984, 39 (DEC) :473-477

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