ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (4): 844-851.doi: 10.11843/j.issn.0366-6964.2016.04.026

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Effect of Smudgy Degree on Temperature Distribution of the Udder Surface in Dairy Cow

PENG Dan-dan,CHEN Jian,ZHAO Yue,HAN Li,LI Gan,YANG Chun-he,GU Xian-hong*   

  1. (State Key Laboratory of Animal Nutrition,Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China)
  • Received:2015-08-04 Online:2016-04-23 Published:2016-04-23

Abstract:

In order to improve the accuracy of detecting dairy cow subclinical mastitis by infrared thermography,the effect of smudgy degree on temperature distribution of the udder surface in dairy cow was studied.325 dairy cows with normal udder appearance and SCC<5×105 •mL-1 were selected.Their rear udders were partitioned into teat cistern,mammary cistern and mammary gland,and the smudgy degree was graded according to a 3-point scoring system.Then different parts of rear udder were divided into 4 groups.The results showed that the difference of skin temperature of left and right sides at the different parts was not significant(P>0.05) in the clean rear udder.It was also found that the mean skin temperature,minimum temperature and maximum temperature from mammary gland,mammary cistern to teat cistern significantly reduced or had a tendency to be lower,and that the decreased amplitude was 1.90,6.90 and 1.62 ℃,respectively.However,with the increase of degree of the smudge,at teat cistern,mammary cistern and mammary gland,the minimum skin temperature,was sharply decreased(P<0.01),mean temperature had a tendency to reduce,and the variational degree of temperature was significantly increased(P<0.01).These results indicated that smudgy degree of udder surface had an important effect on its temperature distribution,the highest temperature of mammary gland had a smaller effect of smudge,which is optimum to determine subclinical mastitis of dairy cow by IRT method.

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