| Autor: |
BUGEAC, Teodor, MACIUC, V., CREANGĂ, Şt. |
| Předmět: |
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| Zdroj: |
Bulletin of the University of Agricultural Sciences & Veterinary Medicine Cluj-Napoca. Animal Science & Biotechnologies; 2013, Vol. 70 Issue 1, p150-154, 5p |
| Abstrakt: |
Nowadays molecular profiling of dairy animals and the relationships between certain genetic polymorphisms and milk production traits is of great interest. In particular, the polymorphism of the six major milk protein genes was intensively studied and significant associations between some allelic forms and milk yield, milk quality and its manufacturing properties were found. However, their effect may vary between different breeds. Early selection for favorable allele could be a powerful tool to improve milk production by keeping only the valuable animals. Therefore, the aim of the current paper was to investigate the genetic correlations between some allelic variants found in CSN2, CSN3 and LGB loci and milk production traits in a population of Holstein-Frisian cows reared in a farm located in the Northeastern part of Romania. The study was carried out on 34 Holstein-Friesian cows from which we collected milk samples and genotyped for the six major milk protein loci by isoelectric focusing technique (IEF). Milk composition was determined with MilkoScan FT 6000 FOSS. The genetic parameters were estimated by using the R.E.M.L. model (Restricted Maximum Likelihood). CSN3 gene had a high heritability (h2=0.42), whilst CSN2 and LGB medium values were found (h2=0.28 and h2=0.23, respectively). We found positive and strong correlations between LGB and milk yield (0.34) and fat contents (0.34), but also negative and strong correlations between CSN3 and milk yield. Based on the correlations found we concluded that selection for some genetic variants found in milk protein loci may improve some milk production traits in this breed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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