Twenty-four Angus X Hereford steers (155 +/- 4 kg) were used to examine thyroid function during exposure to ambient temperatures of 4, 18 and 32 C. Jugular cannulae were inserted after steers were acclimated to individual stalls in environmentally controlled chambers at 18 C for 3 d. The day following cannulation, ambient temperatures were changed 2 C/h for 7 h and serum samples were collected ...

Figure 1 is a block diagram representation of the I/O and architecture for a 16 or 32-bit counter. Pin CLK is the clock signal, RST the reset signal, and LOAD the load data signal. CLK is a positive, edge-triggered synchronous signal, and LOAD is an active low, synchronous signal. Pins D0 through D15, 31 are the load data inputs, and pins Q0 through Q15, 31 are the count bits. Pin Ci is the car...