Assessment of genetic variation for pathogen-specific mastitis resistance in Valle del Belice dairy sheep Mastitis resistance is a complex and multifactorial trait, and its expression depends on both genetic and environmental factors, including infection pressure. The objective of this research was to determine the genetic basis of mastitis resistance to specific pathogens using a repeatability threshold probit animal model. The most prevalent isolated pathogens were coagulase-negative staphylococci (CNS); 39% of records and 77% of the animals infected at least one time in the whole period of study. There was significant genetic variation only for Streptococci (STR). In addition, there was a positive genetic correlation between STR and all pathogens together (ALL) (0.36 ± 0.22), and CNS and ALL (0.92 ± 0.04). The results of our study support the presence of significant genetic variation for mastitis caused by Streptococci and suggest the importance of discriminating among different pathogens causing mastitis due to the fact that they most likely influence different genetic traits. Low heritabilities for pathogen specific-mastitis resistance may be considered when including bacteriological status as a measure of mastitis presence to implement breeding strategies for improving udder health in dairy ewes. mastitis, ewes, pathogens, resistance: Marco Tolone, Cristian Larrondo, Scott Newman,Anna Maria Sutera, Rosalia di Gerlando, Salvatore Mastrangelo, José M. Yáñez Baldassare Portolano

Marco Tolone, Cristian Larrondo, Scott Newman, Anna Maria Sutera, Rosalia Di Gerlando, Maria Teresa Sardina, Salvatore Mastrangelo, José Manuel Yáñez, Baldassare Portolano

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Biology - Disease Resistance 2, , 986, 2018
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