Effect of ?S1-casein Polymorphisms on Milk Composition and Cheesemaking Efficiency in Carpathian Goat Breed

Valentin A. BALTEANU

Abstract


In goat milk, among the four caseins, ?S1-casein (?S1-CN) locus is the most
polymorphic. Eighteen alleles with four different expression levels have been identified so far in
different goat breeds, having a significant influence on milk protein, casein, fat contents,
manufacturing properties and cheese yield.
In Carpathian goat breed, which exhibits a high heterogeneity concerning milk quality, we
already reported a high degree of ?S1-CN polymorphism. However, no studies were done in this breed
so far to quantify the effect of this locus polymorphism on milk parameters. In this respect, four
different experimental lots with different genotypes in ?S1-CN locus (AA, EE, FF and a control
heterozygous lot-HET) were organized in 2009. In 2010, monthly controls were conducted in the goats
from the experimental lots. Differences between ?S1-CN genotypes were observed in analyzed milk
quality parameters: fat content, whole protein and whole casein (AA>HET>FF>EE), unfatty dry
matter (AA>FF>HET>EE), lactose (FF>AA> EE> HET), urea (FF>HET>AA>EE) and somatic cells
(FF>HET>EE>AA).
In 2010 season one hundred liters of milk from each genotype group (AA, EE, FF and HET)
were processed in green cheese in the same conditions. Differences between genotypes concerning the
cheese yield were observed: AA-EE=17,33%; AA-FF=16,48%; FF-EE=5,84%. EE cheese type was
jugged as having the strongest goaty flavour, AA the weakest, FF being intermediate. Some results
obtained in our study (PN II Project no. 52104/2008) are in contrast with those obtained in other goat
breeds.

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DOI: http://dx.doi.org/10.15835/buasvmcn-asb:68:1-2:6670




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