Effects of polymorphism at 5'-noncoding regions [promoters] of alphaS1- and alphaS2-casein genes on selected milk production traits in Polish Black-and-White cows

• Autorzy: Szymanowska M , Strzalkowska N. , Siadkowska E. , Krzyzewski J. , Ryniewicz Z. , Zwierzchowski L.
• Języki publikacji: EN

Abstrakty

EN

The effects of cow’s genotype at αS1- and αS2-casein gene 5’-noncoding regions (promoters) were determined on selected milk production traits of the 135 Polish Black-and-White (Polish Friesian) cows as related to the animal’s age, lactation parity and stage, and somatic cell count. Cows of the AA genotype of αS1-casein gene yielded more milk daily than AG heterozygotes. Also, the daily yield of solids-non-fat, protein and lactose was higher in AA genotype cows. Milk of the cows with genotype CC of αS2-casein contained more lactose but less protein than that of the CT heterozygotes. The daily protein yield was slightly (but significantly) higher in the cows of the CT αS2-casein genotype. In summary, the results showed that genetic variants of αS1- and αS2-casein 5’-noncoding regions had only a slight effect on milk production traits of the Polish Black-and-White cows. Nevertheless,the AA genotype of αS1-casein seemed favourable for higher milk yield, as well as for lactose and protein content.

PL

Zbadano wpływ polimorfizmu w rejonie niekodującym 5’ genów kazein αS1 i αS2 na cechy charakteryzujące mleczność i skład mleka 135 polskich krów rasy cb (wydajność dzienna, zawartość suchej masy, suchej masy beztłuszczowej, tłuszczu, białka i laktozy) zależnie od wieku zwierząt, stadium laktacji i liczby komórek somatycznych (SCC) w mleku. Stwierdzono, że krowy o genotypie AA kazeiny αS1 produkowały więcej mleka niż heterozygoty AG. Także dzienna produkcja niektórych składników, w tym białka i laktozy, była większa w mleku krów o genotypie AA. Mleko krów o genotypie CC kazeiny αS2 zawierało więcej laktozy, lecz mniej białka niż mleko heterozygot CT. Dzienna produkcja białka była nieznacznie, ale istotnie większa w mleku krów o genotypie CT kazeiny αS2. Uzyskane wyniki świadczą, że w porównaniu z wyraźnym wpływem okresu laktacji, wieku krów i SCC, warianty genetyczne niekodujących rejonów 5’ genów kazein αS1 i αS2 wpływają w niewielkim stopniu na cechy produkcji mleka krów rasy cb. Tym niemniej, genotyp AA kazeiny αS1 wyraźnie korzystnie wpływa na wydajność mleka oraz zawartość w nim laktozy i białka.

Słowa kluczowe

EN

cow; alphaS2-casein gene; promoter; polymorphism; alphaS1-casein gene; 5'-noncoding region; Polish Black-and-White breed; animal breeding; milk production; milk production trait; milk; casein gene

• Wydawca: -
• Czasopismo: Animal Science Papers and Reports
• Rocznik: 2003
• Tom: 21
• Numer: 2
• Opis fizyczny: p.97-108

Twórcy

autor

Szymanowska M

• Polish Academy of Sciences, Jastrzebiec, 05-552 Wolka Kosowska, Poland

autor

Strzalkowska N.

autor

Siadkowska E.

autor

Krzyzewski J.

autor

Ryniewicz Z.

autor

Zwierzchowski L.

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