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Titolo:
Genetic and phenotypic parameters for individual cow somatic cell counts in Zimbabwean Holstein-Friesian cattle
Autore:
Imbayarwo-Chikosi, EV; Makuza, SM; Wollny, CBA; Banda, JW;
Indirizzi:
Univ Malawi, Bunda Coll Agr, Lilongwe, Malawi Univ Malawi Lilongwe Malawi iv Malawi, Bunda Coll Agr, Lilongwe, Malawi
Titolo Testata:
ARCHIV FUR TIERZUCHT-ARCHIVES OF ANIMAL BREEDING
fascicolo: 2, volume: 44, anno: 2001,
pagine: 129 - 137
SICI:
0003-9438(2001)44:2<129:GAPPFI>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
DAIRY-CATTLE; MILK-YIELD; LACTATION; SELECTION; MASTITIS; HEALTH; TRAITS; SCORE;
Keywords:
Zimbabwe; Holstein-Friesian; somatic cell counts (SCC); milk yield; fat corrected milk (FCM); fat kg; protein kg;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Wollny, CBA P Bag 7762, Harare, Zimbabwe P Bag 7762 Harare ZimbabweP Bag 7762, Harare, Zimbabwe
Citazione:
E.V. Imbayarwo-Chikosi et al., "Genetic and phenotypic parameters for individual cow somatic cell counts in Zimbabwean Holstein-Friesian cattle", ARCH TIER, 44(2), 2001, pp. 129-137

Abstract

Genetic and phenotypic parameters for lactation average individual cow SCCin Holstein cattle were estimated. Records From the Zimbabwe Dairy Services Association included a total of 7912 lactation records, from which were 1453 first lactation, 2211 second lactation and 4248 third and later lactation records for the period 1994 to 1998. SCC were transformed through a base2 logarithm. Genetic parameters were estimated with the AIREML programme. A univariate mixed animal model was used to estimate heritabilities and repeatabilities. The heritability estimates for log(2)SCC were 0.10, 0.12 and 0.14 for the respective first, second, third and subsequent lactations. Estimate of repeatability for log(2)SCC was 0.17. Genetic and phenotypic correlations were estimated with a multivariate mixed animal model. Genetic correlation estimates between log(2)SCC and the production traits were low to medium and negative (-0.05 to -0.55) whilst the phenotypic correlation estimates were low and negative (-0.04 to -0.22). As individual cow SCC data collection continues in Zimbabwe, there are opportunities for genetic re-evaluation of this trait with a larger data set. This could possibly include udder type traits, most of which have been reported to be associated with SCC.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 05:13:43