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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0520    [Accepted] Published online January 13, 2020.
Gene polymorphisms influencing on yield, composition and technological properties of milk from Czech Simmental and Holstein cows
Jindrich Citek1,*  , Michaela Brzakova1  , Lenka Hanusova1  , Oto Hanus2  , Libor Vecerek1  , Eva Samkova1  , Zuzana Krizova1  , Irena Hostickova1  , Tereza Kavova1, Karolina Strakova1, Lucie Hasonova1 
1University South Bohemia, Faculty of Agriculture, CZ37005 Ceske Budejovice, Czech Republic
2Dairy Research Institute, CZ16000 Prague, Czech Republic
Correspondence:  Jindrich Citek, Tel: +420387772591, Fax: +420387772593, Email: citekjc@seznam.cz
Received: 28 June 2019   • Revised: 4 October 2019   • Accepted: 10 January 2020
Abstract
Objective
The aim of the study was to evaluate the influence of polymorphic loci and other factors on milk performance and the technological properties of milk.
Methods
The analysis was performed on Simmental and Holstein cows in field conditions. Milk yield in kg, fat and protein percentage and yield were evaluated. Technological properties were evaluated by milk fermentation ability, renneting, and an alcohol test. Polymorphisms in the DGAT1, LEP, FASN, SCD1, CSN2, CSN3 and LGB genes were genotyped, and association analysis was performed.
Results
The DGAT1 AA genotype was associated with higher milk, protein and fat yields (p0.05). The MM genotype in the LEP gene was associated with a lower protein percentage and the W allele with a higher protein percentage (p0.05). In cows with the FASN GG genotype, the protein percentage was higher, but the A allele was associated with higher milk, protein and fat yields than the G allele. The TT genotype in SCD1 was associated with the lowest milk, protein and fat yields and with the highest milk protein percentage (p0.01). The T allele had higher values than the C allele (p0.05) except for fat percentage. The genotype CSN3 AA was associated with a significantly heightened milk yield; BB was associated with a high protein percentage. The effect of the alleles on the technological properties was not significant. The CSN2 BB genotype was associated with the best alcohol test (p0.01), and the renneting order was inverse. Milk from cows with the CSN2 A1A1 genotype was best in the milk fermentation ability. CSN3 significantly affected the technological properties.
Conclusion
The findings revealed the potential of some polymorphic loci for use in dairy cattle breeding and for the management of milk quality. In field research, the pivotal role of farms in milk yield, composition and technological properties was confirmed.
Keywords: Dairy Cattle; Performance; Milk Fermentation Ability; Renneting; Ethanol Test
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