Cattle ranching is not common in the forest region of West Africa because of the _______?

Step 1: Analyze the question The question asks why cattle ranching is not common in the forest (rainforest) region of West Africa. We need the main limiting factor for cattle there.

Step 2: Explain the concept Cattle rearing in West Africa is concentrated in the Sahel and Guinea savanna zones, while the humid forest belt (southern Nigeria, southern Ghana, Côte d'Ivoire, etc.) has very little of it. The reasons include:

• Tsetse fly infestation: The tsetse fly thrives in warm, humid, forested and bushy areas. It transmits trypanosomiasis (nagana) to cattle, which causes weakness, weight loss, reduced milk yield, and death. This is the classic, most important reason.
• Poor quality grass: Forest vegetation is dominated by trees with a dense canopy, so little light reaches the ground. Grass is sparse and not very nutritious. It is a contributing factor, but the key disease factor is the tsetse fly.

Step 3: Evaluate the options

• A. Scarcity of grass for fodder: There is some truth to this, since forests have less grass than savanna. But it is not the standard main answer, as fodder can be supplied and pasture can be developed.
• B. Presence of tsetse flies: Correct. Tsetse flies cause nagana, which kills or weakens cattle, making ranching unprofitable in forest zones.
• C. Absence of Fulani herdsmen: Wrong. Fulani herders move south seasonally, and their absence is a result of the environment, not a cause.
• D. Presence of wildlife: Wrong. Wildlife exists in the savanna too, and it is not a major barrier to ranching.

Step 4: Answer The correct option is B. Presence of tsetse flies.

Step 5: Exam tip Remember: "Tsetse = Trypanosomiasis = No cattle in the forest." Whenever you see a question on why cattle are not reared in the forest belt or the humid south, think of the tsetse fly first. A related point: the savanna is the main cattle zone because it has plenty of grass and fewer tsetse flies, and the Sahel is drier but good for grazing.