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Sensitivity and specificity of infrared thermography in detection of subclinical mastitis in dairy cows    
Yazarlar
Bülent Polat
Atatürk Üniversitesi, Türkiye
Armağan Çolak
Atatürk Üniversitesi, Türkiye
Mehmet Cengiz
Atatürk Üniversitesi, Türkiye
Latif Emrah Yanmaz
Atatürk Üniversitesi, Türkiye
Hasan ORAL Hasan ORAL
Kafkas Üniversitesi, Türkiye
Ayhan Baştan
Ankara Üniversitesi, Türkiye
Semra KAYA Semra KAYA
Kafkas Üniversitesi, Türkiye
Armağan Hayırlı
Atatürk Üniversitesi, Türkiye
Özet
The objectives of this experiment were to determine interrelationships among mastitis indicators and evaluate the subclinical mastitis detection ability of infrared thermography (IRT) in comparison with the California Mastitis Test (CMT). Somatic cell count (SCC), CMT, and udder skin surface temperature (USST) data were compiled from 62 Brown Swiss dairy cows (days in milk=117+/-51, milk yield=14.7+/-5.2 kg; mean +/- SD). The CORR, REG, and NLIN procedures of Statistical Analysis System (SAS Institute Inc., Cary, NC) were employed to attain interrelationships among mastitis indicators. The diagnostic merit of IRT as an indirect measure of subclinical mastitis was compared with CMT using the receiver operating characteristics curves. The udder skin surface temperature was positively correlated with the CMT score (r=0.86) and SCC (r=0.73). There was an exponential increase in SCC (SCC, x10(3) cells/mL=22.35 x e(1.31 x CMT score); R(2)=0.98) and a linear increase in USST (USST, degrees C=33.45+1.08 x CMT score; R(2)=0.75) as the CMT score increased. As SCC increased, USST increased logarithmically [USST, degrees C=28.72+0.49 x ln(SCC, x10(3) cells/mL); R(2)=0.72]. The USST for healthy quarters (SCC 400,000 cells/mL; n=135) (mean +/- SE; 33.45+/-0.09 vs. 35.80+/-0.08 degrees C). The sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, positive predictive value, and negative predictive value were 95.6, 93.6, 14.97, 0.05, 95.0, and 93.6, respectively, for IRT and 88.9, 98.9, 83.56, 0.11, 99.2, and 86.1, respectively, for CMT. The area under the receiver operating characteristics curve for IRT and CMT was not different. In conclusion, as a noninvasive and quick tool, IRT can be employed for screening subclinical mastitis via measuring USST, with a high predictive diagnostic ability similar to CMT when microbiological culturing is unavailable. However, the reliability of IRT among cows with different characteristics and those living under various environmental conditions remains to be determined.
Anahtar Kelimeler
infrared thermography | udder skin surface temperature | California Mastitis Test | somatic cell count
Makale Türü Özgün Makale
Makale Alt Türü SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale
Dergi Adı JOURNAL OF DAIRY SCIENCE
Dergi ISSN 0022-0302
Dergi Tarandığı Indeksler SSCI
Makale Dili İngilizce
Basım Tarihi 08-2010
Cilt No 93
Sayı 8
Sayfalar 3525 / 3532
Doi Numarası 10.3168/jds.2009-2807
Makale Linki http://linkinghub.elsevier.com/retrieve/pii/S002203021000370X
Atıf Sayıları
WoS 108
Sensitivity and specificity of infrared thermography in detection of subclinical mastitis in dairy cows

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