3SANTOS J E P,CERRI R L A,et al.Effect of timing of first clinical mastitis occurrence on lactation and reproductive performance of Holstein dairy cows[J].Animal reproduction science,2004,80(1-2):31-45.
4SORDILLO L M,Streich K L.Mammary gland immunity and mastitis susceptibility[J].J Mammary Gland Biol Neoplasia,2002,7(2):135-146.
5DONOVAN D M,DONG S,GARRETT W,et al.Peptidoglycan hydrolase fusions maintain their parental specificities[J].Applied and environmental microbiology,2006,72(4):988-996.
