Agriculture is the backbone and single largest sector of Pakistan’s economy as its contribution to Gross Domestic Product (GDP) exceeded 25.3 percent during 1997-98. Crops, livestock, fishing and forestry sub-sectors being its main components, only crop and livestock sub-sectors are of critical importance. They accounted for 59.6 and 36.2 percent of the sector’s output respectively. Because of the ongoing process of structural transformation, agriculture’s share in the national economy is shrinking. From 39 percent of GDP in 1969-70 it has fallen to its current levels [Pakistan (1999a)]. The livestock sub-sector however has not followed suit. It has risen from 27.3 percent in 1969-70 to 36.2 percent in 1997-98. This trend in fact would be more pronounced if the national accounts did not underestimate the sub-sector’s components such as farm yard manure, dung cakes for household fuels and animal draft power.