Biological position of viruses: Viruses lack a cytoplasmic membrane and they do not have the basic component of a cell. They can only replicate inside the host cell. Outside the host cell, they are non-living.
The yearling program was, however, more variable with a maximum profit of $356 per head compared with $206 for calf fed, and a maximum loss of $171 per head compared with $152 for the calf fed program.
The following table illustrates the difference in the cost of feed and labor for weaning a calf at 5 or 8 weeks of age. This example represents estimated prices for a good quality milk replacer and calf starter. Under these circumstances, weaning a calf at 5 weeks instead of 8 weeks saves $26.89 per calf.