Factors Affecting Holstein Cattle Fertility Traits in the Slovak Republic

Zuzana Riecka, Juraj Candrák, Eva Strapáková

Abstract


We investigated the influence of the factors herd-year, breed-type, sire, and milk production and lactation length on the fertility traits of Holstein cattle (age at first calving, calving interval, days open, non return rate at 56, 72, and 90 day). The data were received from 87 230 Holstein cows first time calved in period 2000 and 2008 with three fullterm lactations. Average age at first calving was 875 days and average milk production on first, second and third lactation was 6816 kg, 7524 kg and 6536 kg, respectively. Coefficient of determination estimated by linear model with factors as join herd-year effect and sire was 0.1164 (P<0,001) and 0.1145 (P<0,001) for variation of calving interval after 1st lactation and 2nd lactation, respectively. When the quadratic effect of milk production and lactation length was included to the linear model, coefficient of determination for calving interval variation increased significantly to 0.7049 (P<0,001) after 1st lactation and to 0.6297 (P<0,001) after 2nd lactation. Basically on these results including milk production and lactation length to the fertility genetic evaluation is needed.


Keywords


fertility traits; milk production; genetic evaluation

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Scientific Papers Animal Science and Biotechnologies publish open access articles under the terms of the Creative Commons Attribution 4.0 Licence (read full legal code).


LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Faculty of Animal Science and Biotechnologies
300645, Timişoara, Calea Aradului 119, Romania

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