Why does the carcass stiffen?
Carcass stiffens because of rigor mortis. When the life ends, there is a chemical change to the muscle cells. It's one of the recognizable signs of death.
A carcass will stiffen because of a process called rigor mortis. This means stiffness of death. This will begin to happen about 6-8 hours after death and can help to fix the time of death. The time is dependent on temperature and other factors. The carcass will loose the stiffness as the body tissues begin to decompose.
Yes it normal for infants to stiffen when crying or screaming. It is caused by the action of crying (try screaming really loud and you will find that you tense your body), they also stiffen if they do not want to be picked up. As long as the stiffness does not last beyond the crying there is nothing to worry about.
Since no carcass weight is the same, we will only use the average carcass weight taken from a Hereford-Angus cross steer that was finished at 1400 lbs. Doing the math, the carcass weight (dressing yield) of a 1400 lb steer is 0.58 x 1400 = 812 lbs. Then the amount of ready-to-eat meat (meat deboned and after cooking) from that carcass weight is 686 x 0.49 = 400 lbs. However, assuming by "meat" you are…