COMPOSITION OF COWS MILK .2. GENETIC INFLUENCES

被引：10

作者：

THOMPSON, NR

LOGANATH.S

机构：

[1] Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg

来源：

JOURNAL OF DAIRY SCIENCE | 1968年 / 51卷 / 12期

关键词：

D O I：

10.3168/jds.S0022-0302(68)87316-3

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Heritabilities and genetic correlations were estimated from 4,552 records on 3,472 Holstein-Friesian cows by 630 sires. Heritabilities by paternal half-sib correlation of deviations from herdmates were milk yield, .23; fat yield, .09, solids-not-fat yield, .22; fat per cent, .45; and solids-not-fat per cent, .47. Heritabilities by regression of daughter on dam with 438 pairs of records were milk yield, .37; fat yield, .22; solids-not-fat yield, .27; fat per cent, .55; and solids-not-fat per cent, .25. Genetic correlations among yields were milk fat, .79; milk solids-not-fat, .95; fat solids-not-fat, .85. Selection for milk yield should give 94% as much gain in solids-not-fat yield as would direct selection for solids-not-fat yield. © 1968, American Dairy Science Association. All rights reserved.

引用

页码：1933 / &

共 19 条

[1] VARIATION IN LACTATION YIELD OF MILK CONSTITUENTS [J].