HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Carabaño, M. J. Articles by Alenda, R. Search for Related Content PubMed PubMed Citation Articles by Carabaño, M. J. Articles by Alenda, R.

Estimation of Genetic Parameters for Milk and Fat Yields of Dairy Cattle in Spain and the United States

Department of Animal Science, Cornell University, Ithaca, NY 14853

G. R. Wiggans

Animal Improvement Programs Laboratory, Agricultural Research Service , United States Department of Agriculture, Beltsville, MD 20705

R. Alenda

Departamento de Produccion Animal, Instituto Nacional de Investigaciones Agrarias, 28040 Madrid, Spain

ABSTRACT

Interaction of genotype with environment was studied with 10,780 Spanish production records (daughters of 210 Holstein-Friesian bulls) and two subsets of United States data (800, 821 records with 1170 sires and 762, 152 records with 1186 sires). Only 74 bulls had daughter records in both Spanish and United States data. Genetic and phenotypic (co)variances and correlations and heritability for milk and fat yields were estimated both within country and between countries with countries considered as separate traits (joint analysis). (Co)variance components were estimated with a REML procedure. Heritability estimates for milk and fat in the Spanish population (.16 and .14, within country; .12 and .09, joint) were smaller than for United States data (means of .33 and .31, within country; .26 and .24, joint). Genetic and phenotypic correlations between milk and fat within country were higher for Spain (.94 and .91) than for United States data (means of .66 and .81). Genetic correlation between countries averaged .81 for milk and .50 for fat. Rankings of bulls for milk yield are expected to be similar in Spain and the United States, although a scaling effect on predicted values is expected from different genetic variances in each country. Ranking of bulls for fat yield may be quite different.

¹ Present address: Departamento de Produccion Animal, Instituto Nacional de Investigaciones Agrarias, 28040 Madrid, Spain.

² Present address: Department of Animal Science, University of Nebraska, Lincoln 68583.

This article has been cited by other articles:

				H. Hammami, B. Rekik, H. Soyeurt, A. Ben Gara, and N. Gengler Genetic Parameters for Tunisian Holsteins Using a Test-Day Random Regression Model J Dairy Sci, May 1, 2008; 91(5): 2118 - 2126. [Abstract] [Full Text] [PDF]

				W. J. Fulkerson, T. M. Davison, S. C. Garcia, G. Hough, M. E. Goddard, R. Dobos, and M. Blockey Holstein-Friesian Dairy Cows Under a Predominantly Grazing System: Interaction Between Genotype and Environment J Dairy Sci, February 1, 2008; 91(2): 826 - 839. [Abstract] [Full Text] [PDF]