Genetic Assocciation of Test-day Milk Urea Concentration with Milk Yield in Primiparous Holstein Fresian Cows

Constantin Gavan, Vergil Motorga, Florica Cola, Mihaela Oprea, Florian Dragan

Abstract


The aim of this study wos to estimate genetic parameters of milk urea concentration (MUC) and the relationships with milk yield (MY)  in the first lactation of Holstein Friesian cows. Data consisted of 952 test day records of MY and MUC on 52  first lactation Holstein Friesian cows calving from 2015 and 2016 at Agricultural Research and Development Station (ARDS) Simnic-Craiova, Romania. Random regression models were used to estimate genetic parameters and associations between traits. The coefficient of varation for MUC in the first parity was 38,34%. Average daily heritability of MUC was 0,20. In the first parity,genetic correlation between MUC and MY was positive and increased with days in milk from 0,18 to 0,38.This results confirm that MUC,used for management porposes,may slightly increase due to selection for milk production trait.



Keywords


Keywords:Milk urea,Genetic parameter,Heritability,Genetic correlation

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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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