Naslov
Estimation of genetic parameters for milking speed for Holstein cattle in Croatia

Autori
Lučić, Mandica ; Pocrnić, Ivan ; Špehar, Marija ; Štepec, Miran ; Ivkić, Zdenko ; Barać, Zdravko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
24th International Scientific-Expert Conference of Agriculture and Food Industry, Book of Abstracts, Sarajevo, September 25-28, 2013 / Kurtović Mirsad, Olgun Akin, Padem Huseyin, Filya Ismail - Sarajevo : Poljoprivredno-prehrambeni fakultet u Sarajevu, 2013, 52-52

Skup
24th International Scientific-Expert Conference of Agriculture and Food Industry, Sarajevo, September 25-28, 2013

Mjesto i datum
Sarajevo, Bosna i Hercegovina, 25.09.2013. - 28.09.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
milking speed ; Holstein breed ; test-day records ; genetic parameters

Sažetak
Milking speed has a growing importance from a dairy management standpoint. Cows with slow milking speed require more labour, while cows with fast milking speed could be in greater risk for udder diseases. Selection is therefore aimed for achieving an optimal milking speed. The aim of this paper was to estimate genetic parameters for milking speed using test-day records of Holstein cattle in Croatia. Data included 51, 266 test-day records for 15, 588 first calving cows taken from the central database of the Croatian Agricultural Agency. Pedigree file consisted of 32, 021 animals. In order to improve the normality, logarithmic transformation for milking speed was used. Variance components where estimated using REML method as implemented in the VCE-6 program. Statistical model included calving season, milking time, and milk class as fixed effects, while age at first calving and days in milk were fitted as covariates. Random effects were: direct additive genetic effect, herd-test-day, and permanent environmental effect. The estimated heritability for milking speed was 0.12±0.01. Permanent environmental effect explained 19% of phenotypic variation, while herd-test-day explained another 17% of variability. The proportion of unexplained phenotypic variance was 52%. Results provide genetic parameters for the application of genetic evaluation for milking speed in Croatian Holstein breed.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA