Izlaganje sa skupa

GENETIC PARAMETERS WITH TEST-DAY MODEL IN SLOVENIAN DAIRY SHEEP

A. Komprej ; University of Ljubljana, Biotechnical Faculty, Zootechnical Department,Domžale, Slovenia
G. Gorjanc ; University of Ljubljana, Biotechnical Faculty, Zootechnical Department,Domžale, Slovenia
Š. Malovrh ; University of Ljubljana, Biotechnical Faculty, Zootechnical Department,Domžale, Slovenia
D. Kompan ; University of Ljubljana, Biotechnical Faculty, Zootechnical Department,Domžale, Slovenia
M. Kovač ; University of Ljubljana, Biotechnical Faculty, Zootechnical Department,Domžale, Slovenia

Sažetak

Validation of multiple-trait animal test-day model and the estimation of (co)variance components in Slovenian dairy sheep were performed. For the period 1994-2002,41145 test-day, records of 3317 ewes (2081 Bovec,525 Improved Bovec and 717 Istrian pramenka) were used. The model contained breed only in joint analysis across breeds. Days in milk, parity and litter size were treated as covariates. Random part of the model consisted of common flock environment within test month as flock-year-month, permanent environment as ewe within parity and additive genetic effect. Heritabilities for all breeds together were 0.25 for daily milk yield, 0.14 for fat (FC) and 0.12 for protein content (PC). New estimates of (co)variance components are proposed for regular genetic evaluations in Slovenian dairy sheep. In addition, there are indications for specific lactation curves within flock as well as animal-suggesting random regression models for further research.

Ključne riječi

dairy sheep; genetic parameters; test-day model

Hrčak ID:

164599

URI

https://hrcak.srce.hr/164599

Datum izdavanja:

25.3.2004.

Podaci na drugim jezicima: hrvatski

Posjeta: 610 *