Naslov
Estimates of environmental effects, genetic parameters and genetic trends for reproductive traits in Alpine goats

Autori
Kasap, Ante ; Mioč, Boro ; Jurković, Darko ; Kompan, Dragomir ; Potočnik, Klemen

Izvornik
Acta agriculturae Slovenica (1581-9175) 3 (2012); 193-198

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Alpine breed; reproductive traits; heritability; genetic trends; environmental effects

Sažetak
Study of litter size (LS), birth weight (BW) and litter weight (LW) over successive parities was conducted on diary Alpine goats reared in Croatia. Statistical analysis was performed on records obtained out of 46 722 parturitions from 18 546 goats of different ages and parities. Twining and tripling rates were 27% i.e. 1%. Unadjusted averages for LS, BW and LW were 1.46 lambs, 3.29 kg, and 4.75 kg, respectively. Univariate analysis (repeatability animal model) was used in estimation of variance components and prediction of breeding values. Season (as year- month interaction), age at lambing (as quadratic regression) nested within parity and type of birth were treated as fixed, and herd- year, additive genetic, permanent environmental and residual were treated as random effects, respectively. All investigated effects were statistically significant (P<0.001). Heritability estimates were 0.039, 0.036, and 0.023 for LS, BW, and LW, respectively. Herd- year affected BW (46%) and LW (40%) much more than LS (12%). Average breeding values by year of the birth in the last decade oscillated between investigated years. Positive genetic trends of all investigated traits were determined only after year 2007.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA