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Titolo:
GENETIC-PARAMETERS FOR MILK-YIELD, SURVIVAL WORKABILITY, AND TYPE TRAITS FOR AUSTRALIAN DAIRY-CATTLE
Autore:
VISSCHER PM; GODDARD ME;
Indirizzi:
ROSLIN INST ROSLIN EH25 9PS MIDLOTHIAN SCOTLAND VICTORIAN INST ANIM SCI ATTWOOD VIC 3049 AUSTRALIA
Titolo Testata:
Journal of dairy science
fascicolo: 1, volume: 78, anno: 1995,
pagine: 205 - 220
SICI:
0022-0302(1995)78:1<205:GFMSWA>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINEAR TYPE TRAITS; HERD LIFE; SELECTION INDEXES; MIXED MODEL; WHITE COWS; HOLSTEINS; VARIANCE; INFORMATION; COMPONENTS; PEDIGREE;
Keywords:
GENETIC PARAMETERS; MILK YIELD; STAYABILITY; WORKABILITY; TYPE TRAITS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
P.M. Visscher e M.E. Goddard, "GENETIC-PARAMETERS FOR MILK-YIELD, SURVIVAL WORKABILITY, AND TYPE TRAITS FOR AUSTRALIAN DAIRY-CATTLE", Journal of dairy science, 78(1), 1995, pp. 205-220

Abstract

Genetic parameters, such as heritabilities and genetic correlations were estimated for milk yield, survival, workability, and type traits for Australian Holstein-Friesian and Jersey cattle. All analyses were performed using multivariate REML with a sire model. Heritabilities forlactation yield traits were moderate, ranging from .20 to .28, and heritabilities for mean test day deviations were approximately .40 higher. Heritabilities for survival (probability of surviving to the next lactation) were low, ranging from .02 to .08. Genetic correlations between survival scores were high, ranging from .37 to .98, in particular between adjacent survival scores (on average .91 and .97 for Holstein-Friesians and Jerseys). Heritabilities for stayabilities were larger, ranging from .03 to .22. On average, genetic correlations between stayabilities were very high, ranging from .66 to .99. For milking speed, temperament, and likeability, heritability estimates ranged from .18 (for likeability in Holstein-Friesians) to .29 (for milking speed in Jerseys). Undesirable scores for milking speed and temperament had negative genetic correlations with stayabilities (correlations approximately -.20). Heritabilities for type traits were all moderate (.11 to .42), and genetic correlations among type traits and between type traits and production traits were large. Phenotypic correlations between type traits and stayabilities were low. Generally, genetic correlations between type traits and stayabilities were low although the standard errors of those estimates were large.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 21:06:26