Naslov
Sire Breeding Value Evaluation for difficult calving

Autori
Pogačar, Janez ; Štepec, M ; Rastija, Tomo

Izvornik
Stočarstvo (0351-0832) 50 (1996), 4; 265-268

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

Ključne riječi
breeding value; evaluation; difficult calving

Sažetak
Three groups of first lactation cows, consisting og 12511 Simmental, 15282 Brown and 7924 Black and White breeds were evaluated for difficult calving. The average percentage of difficult calving was 3.41 posto in Simmental, 2.91 posto in Brown and 2.08 posto in Black/White breed. The evaluation of the sires, both as fathers of calves (direct effect) and as fathers of cows (indirect effect) is show. a) as a simple deviaton from the average of the breed and b) as an evaluation of the breeding value according to the BLUP method, in which the following influences are eliminated as interacting ones: sex of the calves x year of calving x season of calving x evaluator. The correlations of breeding value between the two mentioned ways of evaluation are within limits of 0.75 to 0.84. Method b proved to be more exact than method a. According to method LSQ, heritabilitet for difficult calving is low. The values found are between 0.01 and 0.02.

Izvorni jezik
Hrvatski

Znanstvena područja
Šumarstvo

POVEZANOST RADA