Cows gather to feed at the L & Z dairy farm in Fari village on the outskirts of Nigeria's northern city of Kano January 18, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker feeds calves with milk from a feeding bottle at the L & Z dairy farm in Fari village on the outskirts of Nigeria's northern city of Kano January 18, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker feeds a cow at the L & Z dairy farm in Fari village on the outskirts of Nigeria's northern city of Kano January 18, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker operates a grinder to prepare animal feed at the L & Z dairy farm in Fari village on the outskirts of Nigeria's northern city of Kano January 18, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker loads animal feed into a grinder at the L & Z dairy farm in Fari village on the outskirts of Nigeria's northern city of Kano January 18, 2016. (Photo by Akintunde Akinleye/Reuters)





A tribal Fulani man milks a cow at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A tribal Fulani boy stands near cows at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A tribal Fulani woman milks a cow at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A tribal Fulani man milks a cow at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A tribal Fulani woman milks a cow at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker from the L & Z dairy farm tests a sample of milk collected at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





Local herders watch their cows at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





Local herders watch their cows at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker from the L & Z dairy farm records the quantity of milk collected at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)





A worker from the L & Z dairy farm weighs the quantity of milk collected at a local milk collecting centre in Dangwala Karfi village on the outskirts of Nigeria's northern city of Kano January 19, 2016. (Photo by Akintunde Akinleye/Reuters)