In this study the STAT5A/AvaI polymorphism was investigated with PCR-RFLP in a sample of 126 Jersey cattle reared in southern Italy. This polymorphism is localized in the coding region of the bovine STAT5A gene. It is a substitution C→T at position 6853 within the exon 7. Only two out of three possible genotypes for the C/T SNP were identified. The overall frequencies of alleles C and T were 0.76 and 0.24 respectively. In order to study the relationship between STAT5A/AvaI polymorphism and milk performance traits, the data for a 305-day milk production that include milk yield (MY), protein and fat yield (PY and FY respectively), fat and protein percentage (FC and PC respectively) were used. Significant differences between the two genotypes were found in MY, FY and PY (P<0.01). The CC cows produced more milk than CT ones (6218.09 vs. 5751.72 kg). Moreover CC cows yielded more fat and protein than CT. No significant difference was found in fat and protein content.
Preliminary study on the STAT5A/AvaI polymorphism in Jersey cows: relation with milk production traits
SELVAGGI, MARIA;TARRICONE S;PINTO, Francesco;DARIO, Cataldo
2010-01-01
Abstract
In this study the STAT5A/AvaI polymorphism was investigated with PCR-RFLP in a sample of 126 Jersey cattle reared in southern Italy. This polymorphism is localized in the coding region of the bovine STAT5A gene. It is a substitution C→T at position 6853 within the exon 7. Only two out of three possible genotypes for the C/T SNP were identified. The overall frequencies of alleles C and T were 0.76 and 0.24 respectively. In order to study the relationship between STAT5A/AvaI polymorphism and milk performance traits, the data for a 305-day milk production that include milk yield (MY), protein and fat yield (PY and FY respectively), fat and protein percentage (FC and PC respectively) were used. Significant differences between the two genotypes were found in MY, FY and PY (P<0.01). The CC cows produced more milk than CT ones (6218.09 vs. 5751.72 kg). Moreover CC cows yielded more fat and protein than CT. No significant difference was found in fat and protein content.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
