
TY  - JOUR
A1  - Gaughan, J. B. 
A1  - Sakaguchi, Y. 
T1  - Effect of genotype on performance and carcass characteristics of summer-inducted feedlot cattle
JF  - Science Access
JO  - 
Y1  - 2004
VL  - 1
IS  - 1
SP  - 152
EP  - 155
KW  - high heat load, body surface temperature, feedlot, carcass characteristics
UR  - https://doi.org/10.1071/SA0401039 
N2  - Five hundred and seventy four Bos Taurus steers (Angus, Hereford and Murray Grey) were used in a study to determine the effect of high heat load on performance and carcass characteristics when fed a high energy diet for 165-183 days. The trial was undertaken at a commercial feedlot between December 2002 and June 2003. Regardless of coat colour, body surface temperature of feedlot cattle rose (P<0.05) as climatic conditions changed from thermoneutral (Temperature and Humidity Index (THI)<74) to moderate (THI 74-77). Under extremely hot conditions, body surface temperature was higher (P<0.05) for Angus compared with Murray Grey (43.4°C and 38.4°C, respectively) steers. Murray Grey steers had greater average daily gain than either Angus or Hereford. There were no differences between breeds for carcass weight, eye-muscle area and marbling score. However, Murray Grey steers had an ideal subcutaneous fat coverage, and in terms of reduced labour costs, Murray Grey steers could be economically more efficient than either Angus or Hereford steers. 
ER  -

