Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
GENETIC-CHARACTERISTICS AND EVOLUTION OF SEMEN PRODUCTION OF YOUNG NORMANDE BULLS
Autore:
DUCROCQ V; HUMBLOT P;
Indirizzi:
INRA,GENET QUANTITAT & APPL STN F-78352 JOUY EN JOSAS FRANCE UNION NATL COOPERAT ELEVAGE & INSEMINAT ARTIFICIELLE MAISONS ALFORT FRANCE
Titolo Testata:
Livestock production science
fascicolo: 1, volume: 41, anno: 1995,
pagine: 1 - 10
SICI:
0301-6226(1995)41:1<1:GAEOSP>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESTRICTED MAXIMUM-LIKELIHOOD; HOLSTEIN BULLS; DAIRY BULLS; AI BULLS; TRAITS; BREED; PARAMETERS; COMPONENTS; GROWTH; MODELS;
Keywords:
BULL; SEMEN PRODUCTION; GENETIC PARAMETER; GENETIC EVALUATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
V. Ducrocq e P. Humblot, "GENETIC-CHARACTERISTICS AND EVOLUTION OF SEMEN PRODUCTION OF YOUNG NORMANDE BULLS", Livestock production science, 41(1), 1995, pp. 1-10

Abstract

Genetic parameters on average volume of the ejaculate, spermatozoa concentration, motility score and percentage of motile spermatozoa afterthawing were estimated by restricted maximum likelihood applied to ananimal model and using records collected from 1957 young Normande bulls. The heritability of the average volume of the ejaculate is very high (h2 = 0.65 +/- 0.09). Sperm quality traits are moderately heritable(h2 = 0.23 +/- 0.08 for motility score to 0.37 +/- 0.09 for concentration) and strongly correlated. Total percentage of abnormal spermatozoa estimated from a selected subset seems less heritable (h2 = 0.19 +/-0.07). A Best Linear Unbiased Prediction was then carried out on the records from 2387 bulls using these estimates. No clear genetic trend could be detected in the population, although the phenotypic selectionperformed should be efficient. This apparent contradiction results from the increasing influence in the breed of one family of heavily usedbull sires with a poor genetic merit on sperm production traits.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:14:19