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Since lactoferrin is acute phase protein and has an exceptional role in   defense mechanism of mammary gland, it is considered a candidate gene for   mastitis susceptibility in dairy cattle. In this study, blood samples were   collected for DNA extraction from fifty Holstein dairy cows in the third   lactation season reared under Egyptian conditions assigned into three groups   mastitis (n=15), subclinical mastitis (n=20) and healthy (n=15) based on   California mastitis test. Moreover biochemical markers for inflammation were   determined to detect severity. PCR amplification of a segment of 6th intron   of lactoferrin gene yielded a fragment of 301-bp in all animals under study.   For revealing polymorphism, DNA sequencing was done for PCR products of   lactoferrin gene (301-bp) in only five healthy (resistant) and five affected   animals. Results indicated that, association between biochemical data and   affections. The PCR-DNA sequencing genetic assessment identified twelve SNPs   in the bovine lactoferrin gene and there was association between these   identified SNPs and mastitis susceptibility, where ten nucleotide sequence   variations for one of the healthy animals were obtained with A166T, T185A,   T200C, G230C, A239G, T251G, A254C, A272C, T273C and A296G SNPs (submitted to   GenBank with accession number gb|KT159457|. On the other hand, two nucleotide   sequence variations for two of the affected animals were obtained with A100G   and T275A SNPs. Consequently, the identified SNPs in the bovine lactoferrin   gene can be used as marker-assisted selection (MAS) to predict, improve   mastitis resistance and minimize incidence of mastitis infection in Holstein   dairy cows

Novel single nucleotide polymorphisms in lactoferrin gene and their association with mastitis susceptibility in Holstein cattle