Download - Hair-coat Characteristics of Cattle
![Page 1: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/1.jpg)
Michael Jinsoo Yoo
Advisor: Professor
Kifle G. Ge-bremedhin
HAIR-COAT CHARACTERISTICS OF
CATTLEM. Eng Project
![Page 2: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/2.jpg)
Input to heat and mass transfer models
Help us to select animal breed for different envi-ronments
Useful to identify heat tolerant cows
WHY ARE HAIR AND HAIR-COAT PROPERTIES IMPORTANT?
![Page 3: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/3.jpg)
Physical properties
Optical properties
HAIR COAT PROPERTIES
![Page 4: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/4.jpg)
Hair length (mm) Hair diameter (µm) Density of hair coat (hairs/cm2) Depth of hair coat (mm) Weight of hair coat (mg/cm2)
PHYSICAL PROPERTIES
![Page 5: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/5.jpg)
VARIATIONS IN PHYSICAL PROPERTIES
Climate conditions
Breed of cows
Body location
![Page 6: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/6.jpg)
Climate conditions
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Weight of hair coat
Depth of hair coat
Hair diameter
January
December
December
Greatest
Maia et al. (2005), Berman et al. (1961)
![Page 7: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/7.jpg)
Breed of cows
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Holstein cow
Braford cow
Sahiwal cow
Jersey cow
![Page 8: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/8.jpg)
Holstein
Cow
Braford
Cow
10.5 mm – 18.33 mmHair length
26 µm – 65.15 µmHair diameter
1.3 mm – 19mmDepth of hair coat
4.13 mm – 26.50 mmHair length
11.00 µm – 69.00 µmHair diameter
1.00 mm – 13.00 mmDepth of hair coat
700 hairs/cm2 - 3600 hairs/cm2
Density of hair coat
319 hairs/cm2 - 4851 hairs/cm2
Density of hair coat
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Breed of cows
![Page 9: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/9.jpg)
Rump
Lumbar
Lateral
Belly
Rib
Leg
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Body location
![Page 10: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/10.jpg)
Greatest LocationHair Length (mm)
Rump
Lumbar
Lateral
Rib
10.18
9.98
9.66
10.70
6.86
Body location (Jersey cow, April)
Belly
Leg
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
6.96 8.97
Pan Y.S. (1964)
![Page 11: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/11.jpg)
Hair Diameter (µm)
68.55
63.72
57.56
59.96
46.47
Body location (Jersey cow, April)
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Greatest Location
Rump
Lumbar
Lateral
Rib
Belly
Leg84.3
6 98.28
Pan Y.S. (1964)
![Page 12: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/12.jpg)
Density of Hair Coat (hairs/cm2)
2591.5
2179.5
Body location (Bison cow, Febru-ary)
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Greatest Location
Rump
Lumbar
Lateral
Rib
Belly
Leg2325.5
Peters et al. (1964)
![Page 13: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/13.jpg)
Weight of Hair Coat (mg/cm2)
55.34
64.79
Body location (Bison cow, February)
SOURCE OF VARIATION IN PHYSICAL PROP-ERTIES
Greatest Location
Rump
Lumbar
Lateral
Rib
Belly
Leg64.79
Peters et al. (1964)
![Page 14: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/14.jpg)
HAIR-COAT DENSITY PROFILE
Rump 5300hairs/cm2
1.18cm
Lumbar 7300hairs/cm2
1.36cm
Gebremedhin K.G. (unpublished report)
![Page 15: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/15.jpg)
HAIR-COAT DENSITY PROFILE
Lateral 6300hairs/cm2
1.18cm
Belly 6400hairs/cm2
1.3cm
Gebremedhin K.G. (unpublished report)
![Page 16: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/16.jpg)
HAIR-COAT DENSITY PROFILE
Head 3900hairs/cm2
1.06cm
Gebremedhin K.G. (unpublished report)
![Page 17: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/17.jpg)
Absorptivity (α) Amount of incident energy absorbed by the hair coat
Reflectivity (ρ) Fraction of the incident energy reflected back by the hair coat
Transmissivity (τ) Energy transmitted through the hair coat to the skin surface
Absorptivity + Reflectivity + Transmissivity = 1α + ρ + τ = 1
OPTICAL PROPERTIES OF HAIR COAT
![Page 18: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/18.jpg)
SOURCE OF VARIATIONS IN OPTICAL PROP-ERTIES
Color of hair coat
Black hair coatα = 0.98
Dark-red hair coatα = 0.92
Tan hair coatα = 0.75
White hair coatα = 0.37
Gebremedhin et al. (2011)
![Page 19: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/19.jpg)
REFLECTIVITY AS A FUNCTION OF WAVELENGTH FOR DIFFER-ENT COLORS
da Silva et al. (2003)
![Page 20: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/20.jpg)
da Silva et al. (2003)
ABSORPTIVITY AS A FUNCTION OF WAVELENGTH FOR DIF-FERENT COLORS
![Page 21: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/21.jpg)
ABSORPTIVITY OF DIFFERENT HAIR-COAT COLOR
Gebremedhin et al. (2011)
![Page 22: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/22.jpg)
OPTICAL PROPERTIES
Maia et al. (2003)
Pigmented vs. Non-pigmented
![Page 23: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/23.jpg)
CONCLUSION
Physical properties Range
Hair length (mm) 3.46 – 60Hair diameter (µm) 11 – 123
Depth of hair coat (mm) 1 – 25 Density of hair coat (hairs/cm2) 221 – 7300 Weight of hair coat (mg/cm2) 7 – 108
Factors that affect properties are : body location, climate condition, and breed of cows.
![Page 24: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/24.jpg)
CONCLUSION
The optical properties of hair coat of cows are sig-nificantly affected by color.
Optical properties Hair-coat color Range
AbsorptivityWhite 0.36 – 0.72Black 0.88 – 0.98
ReflectivityWhite 0.45 – 0.53Black 0.046 – 0.089
TransmissivityWhite 0.003 – 0.043Black 0.01 – 0.019
![Page 25: Hair-coat Characteristics of Cattle](https://reader036.vdocuments.us/reader036/viewer/2022062520/56816365550346895dd43a7f/html5/thumbnails/25.jpg)
THANK YOU!