Economy of Nigeria of 5%. By 2012, expenditures stood at $31.61 billion, while revenues was $54.48 billion. Nigeria ranks sixth worldwide and first in Africa in farm output. The sector accounts for about 18% of GDP and almost one-third of employment. Nigeria has 19 million head of cattle, the largest in Africa. Though Nigeria is no longer a major exporter, due to local consumer boom, it is still a major producer of many agricultural products, including: cocoa, groundnuts (peanuts), rubber, and palm oil. Cocoa production, mostly from obsolete varieties and overage trees has increased from around 180,000 tons annually to 350,000 tons. Major
Elaeis guineensis and forms of "Elaeis guineensis" have been selected that have different characteristics. These include: Before the Second World War, selection work had started in the "Deli dura" population in Malaya. Pollen was imported from Africa, and DxT and DxP crosses were made. Segregation of fruit forms in crosses made in the 1950s was often incorrect. In the absence of a good marker gene, there was no way of knowing whether control of pollination was adequate. After the work of Beirnaert and Vanderweyen (1941), it became feasible to monitor the efficacy of controlled pollination. From 1963 until the introduction of the