^pof;
Animal;
Science;
Faculty;
of;
Agriculture;
Usmanu;
Danfodiyo;
University;
Sokoto;
Nigeria;
^pd;
'Etudes;
Spatiales;
de;
la;
Biosphere;
Paul;
Sabatier;
Toulouse;
France;
Livestock;
Ecology;
Justus;
Liebig;
Giessen;
Germany;