Izlaganje sa skupa

SIRE BREEDING VALUE EVALUATION FOR DIFFICULT CALVING

Janez Pogačar ; Biotechnical Faculty, Zootecnical Department, Domžale, Slovenia
M. Štepec ; Biotechnical Faculty, Zootecnical Department, Domžale, Slovenia
Tomo Rastija ; Poljoprivredni fakultet, Osijek, Republika Hrvatska

Sažetak

Three groups of first lactation cows, consisting of 12511 Simmental, 15282 Brown and 7924 Black and White breeds were evaluated for difficult calving. The average percentage of difficult calving was 3.41% in Simmental, 2.91% in Brown, and 2.08 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 deviation 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, h² for difficult calving is low. The values found are between 0.01 and 0.02.

Ključne riječi

Hrčak ID:

164500

URI

https://hrcak.srce.hr/164500

Datum izdavanja:

30.8.1996.

Podaci na drugim jezicima: hrvatski

Posjeta: 502 *