Naslov
Estimation of genetic parameters for calving interval in Croatian Simmental breed

Autori
Špehar, Marija ; Štepec, Miran ; Ivkić, Zdenko ; Bulić, Vesna ; Lučić, Mandica ; Gorjanc, Gregor ; Potočnik, Klemen ; Barać, Zdravko

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

Izvornik
Book of Abstracts of the 47th Croatian and 7th International Symposium on Agriculture / Pospišil, Milan - Zagreb : Agronomski fakultet Sveučilišta u Zagrebu, 2012, 213-214

ISBN
9789537878023

Skup
47th Croatian and 7th International Symposium on Agriculture

Mjesto i datum
Opatija, Hrvatska, 13.02.2012. - 17.02.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
simentalsko govedo; međutelidbeni razmak; genetski parametri
(Simmental cattle; calving interval; genetic parameters)

Sažetak
Selection for higher milk production leads to a decreased fertility performance due to genetic antagonism. Poor fertility is manifested as a low non-return-rate, prolonged lactation, and finally as involuntary culling of dairy cows. The objective of this study was to estimate genetic parameters for calving interval as a fertility parameter in Croatian Simmental breed. Data consisted of 103 046 records for completed standard 305-d lactations, taken from the central database of Croatian Agricultural Agency. The number of animals in pedigree was 82 188. Statistical model included the following fixed class effects: region, calving season and interaction between milk production level and parity. Age at first calving was modelled as quadratic regression. Herd, herd and calving year interaction, direct additive genetic and permanent environment effects were included as random. Variance components were estimated using REML method as implemented in the VCE-6 program. The estimated variances (ratios ± standard error) were: 381.4 (0.06±0.003) for herd, 190.6 (0.03±0.002) for herd and calving year interaction, 415.3 (0.06±0.006) for direct additive genetic and 438.6 (0.06±0.006) for permanent environment effect. Estimated genetic parameters will be used for genetic evaluation of calving interval in Croatian Simmental breed.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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