Genetic structure of milk protein polymorphisms and effects on milk production traits in a local dairy cattle

• DOI: 10.1111/j.1439-0388.2003.00443.x
• Publication Date: 2004-12-26T19:36:52Z
• Authors: A. Caroli; S. Chessa; P. Bolla; E. Budelli; G. C. Gandini
• Keywords: Linkage Disequilibrium; Milk protein

Summary The milk protein genetic structure of the Reggiana dairy local cattle with remarkable quality properties was analysed and compared Italian Friesian Brown cattle. A total 1138 individual samples from three breeds were typed by isoelectrofocusing. Polymorphism found at α s1 ‐casein ( CSN1S1 ), β CSN2 κ CSN3 ‐lactoglobulin LGB ) loci. High frequencies observed for some casein alleles in CSN1S1*C , 25%; CSN2*B : 28%) considerable differences to those a survey carried out 30 years before. great variation among haplotype high linkage disequilibrium detected polymorphic loci CSN1S1‐CSN2‐CSN3. prevalent haplotypes CA 2 B (23%; Reggiana), BA (48%; Friesian) (51%; Brown). Higher G ST values between when considered instead gene frequencies. In cattle, occurrence two rather frequency CSN1S1*C, allowed estimate effects rare on traits. associated significantly higher fat content per cent also 1 haplotype.