Sensitivity and specificity of infrared thermography in detection of subclinical mastitis in dairy cows

Bülent Polat; Armağan Çolak; Mehmet Cengiz; Latif Emrah Yanmaz; Hasan Oral; Ayhan Baştan; Semra Kaya; Armağan Hayırlı

doi:10.3168/jds.2009-2807

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
Prof. Dr. Hasan ORAL Kurum Bilgileri Veteriner Fakültesi Klinik Bilimler Veterinerlik Doğum ve Jinekolojisi Özgeçmiş Sayfası İletişim Bilgileri: Kafkas Üniversitesi, Türkiye
Ayhan Baştan Ankara Üniversitesi, Türkiye
Prof. Dr. Semra KAYA Kurum Bilgileri Veteriner Fakültesi Klinik Bilimler Veterinerlik Doğum ve Jinekolojisi Özgeçmiş Sayfası İletişim Bilgileri: 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	104

Sensitivity and specificity of infrared thermography in detection of subclinical mastitis in dairy cows

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Sensitivity and specificity of infrared thermography in detection of subclinical mastitis in dairy cows

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