scholarly journals NONLINEAR MIXED MODELS TO EVALUATE EFFECTS OF ENVIRONMENT CONDITIONS, HAIR COAT, AND ANCHOR LENGTH ON BODY TEMPERATURE DURING AFTERNOON MILKING OF HOLSTEIN COWS IN HAWAII

2008 ◽  
Author(s):  
N Aitha ◽  
A. M. Parkhurst ◽  
C. N. Lee ◽  
P. E. Hillman
Keyword(s):  
Body Temperature ◽  
Mixed Models ◽  
Holstein Cows ◽  
Hair Coat ◽  
Nonlinear Mixed Models ◽  
Anchor Length

scholarly journals Evaluating the impact of breed, pregnancy, and hair coat on body temperature and sweating rate of hair sheep ewes in the tropics1

2017 ◽  
Vol 95 (7) ◽  
pp. 2936-2942 ◽  
Author(s):  
R. W. Godfrey ◽  
W. D. Preston ◽  
S. R. Joseph ◽  
L. LaPlace ◽  
P. E. Hillman ◽  
...  
Keyword(s):  
Body Temperature ◽  
Sweating Rate ◽  
Hair Sheep ◽  
Hair Coat ◽  
The Impact

scholarly journals Effective thermal conductivity of the hair coat of Holstein cows in a tropical environment

2009 ◽  
Vol 38 (11) ◽  
pp. 2218-2223 ◽  
Author(s):  
Alex Sandro Campos Maia ◽  
Roberto Gomes da Silva ◽  
João Batista Freire de Souza Junior ◽  
Rosiane Batista da Silva ◽  
Hérica Girlane Tertulino Domingos
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Free Convection ◽  
Effective Thermal Conductivity ◽  
Tropical Environment ◽  
Holstein Cows ◽  
Hair Coat ◽  
Black And White ◽  
Low K

The objective of the present study was to assess the effective thermal conductivity of the hair coat (k ef, mW.m-1.K-1) of Holstein cows in a tropical environment, as related to conduction and radiation in the absence of free convection. The average k ef was 49.72 mW.m-1.K-1, about twice the conductivity of the air (26 mW.m-1.K-1) and much less than that of the hair fibres (260 mW.m-1.K-1). The low k ef values were attributed mainly to the small cross area of individual hairs, ρef/ρf (17.2% and 21.3% for black and white hairs, respectively). White coats were denser, with longer hairs and significantly higher k ef (53.15 mW.m-1.K-1) than that of the black hairs (49.25 mW.m-1.K-1). The heritability coefficient of the effective thermal conductivity was calculated as h²=0.18 the possibility was discussed of selecting cattle for increased heat transfer through the hair coat.

Effects of rumen-protected niacin on milk production and body temperature of middle and late lactation Holstein cows

2016 ◽  
Vol 187 ◽  
pp. 16-23 ◽  
Author(s):  
A. Pineda ◽  
J.K. Drackley ◽  
J. Garrett ◽  
F.C. Cardoso
Keyword(s):  
Body Temperature ◽  
Milk Production ◽  
Holstein Cows

scholarly journals Flexible estimation of serial correlation in nonlinear mixed models

2010 ◽  
Vol 37 (5) ◽  
pp. 833-846
Author(s):  
Jan Serroyen ◽  
Geert Molenberghs ◽  
Marc Aerts ◽  
Ellen Vloeberghs ◽  
Peter Paul De Deyn ◽  
...  
Keyword(s):  
Mixed Models ◽  
Serial Correlation ◽  
Nonlinear Mixed Models
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