The availability of FBS is diminishing. Meat and calf prices are increasing as consumers in some countries increase the consumption of beef; and as cattle breeding techniques are permanently improving. These combined factors lead to a reduced frequency of pregnant cows at slaughter. The collection of FBS in new countries has, for many years, compensated for the decrease in supply; but now there are no more new producer countries available. The present world supply of FBS is short and will continue decreasing.