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Titolo:
RELATIONSHIP BETWEEN SEMEN CHARACTERISTICS OF YOUNG AND ADULT BULLS IN THE NORMANDE BREED
Autore:
HUMBLOT P; DUCROCQ V; NEMETH C;
Indirizzi:
UNION NATL COOPERAT ELEVAGE & INSEMINAT ARTIFICIELLE,13 RUE JOUET,BP 65 F-94703 MAISONS ALFORT FRANCE INRA,GENET QUANTITAT & APPL STN F-78350 JOUY EN JOSAS FRANCE
Titolo Testata:
Livestock production science
fascicolo: 3-4, volume: 35, anno: 1993,
pagine: 265 - 281
SICI:
0301-6226(1993)35:3-4<265:RBSCOY>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
MATURE HOLSTEIN BULLS; FERTILITY; QUALITY;
Keywords:
SEMEN PRODUCTION, BULLS, ARTIFICIAL INSEMINATION, NORMANDE BREED;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
P. Humblot et al., "RELATIONSHIP BETWEEN SEMEN CHARACTERISTICS OF YOUNG AND ADULT BULLS IN THE NORMANDE BREED", Livestock production science, 35(3-4), 1993, pp. 265-281

Abstract

Semen production and semen quality of Normande bulls in performance test station and in two AI centers were studied. In station data from 2677 bulls between 12 and 15 months of age, exhibited large differencesbetween 5 groups corresponding to an overall classification given by a technician. Correlations between variables corrected for environmental factors showed a high relationship between all measures of semen quality and number of doses per ejaculate. In the AI centers, trimestral(for the first year) or annual means (for years 2 and 3) of 387 bullswere calculated from monthly means and were analyzed with a mixed model, treating the bull effect as random. Best linear unbiased predictions of the bull effect considering the two periods separately were strongly correlated (0.57 to 0.79). Correlations between corrected data collected in station and bull effect estimates in AI studs were quite high for volume and concentration, and moderate for motility and number of doses per ejaculate or per month. The correlations calculated are underestimates of the true ones, as bulls with undesirable semen characteristics were culled before entering AI. Nevertheless, among the remaining bulls, important differences (40%) in semen output were observedbetween extreme groups, as classified by the technician.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:02:58