Time-to-event analysis of mastitis at first-lactation in Valle del Belice ewes

Portolano, Baldassare; Finocchiaro, R.; Kaam, J.B.C.H.M. van; Riggio, Valentina; Maizon, Daniel Omar

doi:10.1016/j.livsci.2006.11.010

Cited by 3 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Taking into account the predominant sheep husbandry system in Sicily based on grazing with animals kept outdoors, reductions in pasture quantity and quality through the year as in summer (peak of lambing in Valle del Belice sheep) could be a stress factor to increase the susceptibility due to ALL infection. High temperatures in summer are associated with heat stress [ 8 ], and as occurs in dairy cattle heat stress is recognized as a factor which increases susceptibility to mastitis. Gonzalo et al [ 41 ] reported that month within flock and flocks were accounted 44.1 % of the variance on bulk tank bacteria count, whereas Portolano et al [ 8 ] reported that flock-year of lambing effect explains 27 % of the variance of time interval between lambing and first record with mastitis.…”

Section: Discussionmentioning

confidence: 99%

“…Mastitis is one of the most common diseases affecting dairy sheep. Mastitis leads to major economic losses, mainly due to discarded milk, reduced milk production and quality, alteration of cheese-making properties, early culling, and increased health care costs [ 1 – 8 ]. The alterations or reductions of the dry matter of milk and its composition, have a substantial effect on the economic and industrial values of the milk, considering that almost all is processed into fermented products and cheeses [ 4 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of genetic variation for pathogen-specific mastitis resistance in Valle del Belice dairy sheep

et al. 2016

View full text Add to dashboard Cite

BackgroundMastitis 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.ResultsThe 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).ConclusionThe results of our study support the presence of significant genetic variation for mastitis caused by Streptococci and suggest the importance of discriminating between 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.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of genetic variation for pathogen-specific mastitis resistance in Valle del Belice dairy sheep

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Staphylococcus aureus ditemukan dalam susu kambing mastitis klinis maupun mastitis subklinis (Widianingrum et al, 2016). Mastitis akan menyebabkan kerusakan kelenjar penghasil susu, sehingga berpengaruh kepada kualitas dan kuantitas produksi susu (Portolano et al, 2007).…”

Section: Pendahuluanunclassified

Karakterisasi Faktor-faktor Virulensi Staphylococcus aureus Asal Susu Kambing Peranakan Ettawa secara Fenotip dan Genotip

Khusnan¹,

Prihtiyantoro

Hartatik

et al. 2017

Jurnal Sain Veteriner

View full text Add to dashboard Cite

Staphylococcus aureus is a major cause of mastitis in large or small ruminants, and often manifested by subclinical mastitis in Peranakan Ettawa (PE) goats. Staphylococcus aureus in human can cause food borne disease. The research aimed to characterize the virulence factors of Staphylococcus aureus isolated from milk PE goats, phenotypic- and genotypically. Phenotypically characterization were determined through the pigmen assay as well as hydrophobicity, haemolysin, and hemaglutinin reaction. Polymerase chain reaction (PCR) analysis was used to detect 4 virulen genes including coa, clf, fnbA, and fnbB genes. The results of research showed that Staphylococcus aureus abled to produce white pigmen (35,7%), yellow pigmen g (57,1%), andorange pigmen (7,2%). Staphylococcus aureus showed α-hemolysis zone (35,7%), β-hemolysis (35,7%), dan γ-hemolysis (28,9%). Hydrophobicytic test revealed 14,3% Staphylococcus aureus isolates were hydrophobe and85,7% hydrophil. Staphylococcus aureus (85,7%) isolates abled to aglutinated sheep blood cells. Based on genotypic analysis of Staphylococcus aureus could be detected coa gene (92,8%), clf gene (64,3%), fnbA gene (78,6%), and fnbB gene (64,3%). Based on the phenotypic and genotypic characters, it can be concluded that Staphylococcus aureus are virulent strains. This information can be used as the basis for control mastitis in PE goats

show abstract

Effect of somatic cell count level on functional longevity in Valle del Belice dairy sheep assessed using survival analysis

Riggio

Maizon

Portolano

et al. 2009

Journal of Dairy Science

Self Cite

View full text Add to dashboard Cite

The objectives of this study were to evaluate the effect of somatic cell count (SCC) on functional longevity and to estimate the heritability of functional longevity using survival analysis in Valle del Belice dairy sheep. A total of 4,880 lactations of 2,190 ewes from 11 flocks were used. In this study, SCC was considered as an indication of subclinical mastitis. In case of clinical cases, identified by the technicians at milking time, test-day weights and milk samples of those ewes were not considered. Somatic cells were analyzed as counts, without any transformation, and were grouped in 3 classes based on the observed SCC maximum (mxSCC). The mxSCC classes, expressed as 10 3 cells/mL, were classified as 1 if mxSCC ≤ 500, 2 if 500 < mxSCC < 1,000, and 3 if mx-SCC ≥ 1,000. An increase in SCC was associated with an increased hazard of being culled. Ewes in the highest class of SCC on a test-day had a 20% higher hazard of being culled than those in the lowest class. Therefore, SCC played a role in culling decisions of Valle del Belice dairy sheep farmers. The heritability estimate for functional longevity was 7% on the logarithmic scale and 11% on the real scale, indicating that selection for this trait is possible in sheep. The flock-year-season effect explained 19% of the variation on the logarithmic scale and 27% of the variation on the real scale.

show abstract

Time-to-event analysis of mastitis at first-lactation in Valle del Belice ewes

Cited by 3 publications

References 30 publications

Assessment of genetic variation for pathogen-specific mastitis resistance in Valle del Belice dairy sheep

Assessment of genetic variation for pathogen-specific mastitis resistance in Valle del Belice dairy sheep

Karakterisasi Faktor-faktor Virulensi Staphylococcus aureus Asal Susu Kambing Peranakan Ettawa secara Fenotip dan Genotip

Effect of somatic cell count level on functional longevity in Valle del Belice dairy sheep assessed using survival analysis

Contact Info

Product

Resources

About