means for mounting the reservoir on the trough so that it can be moved from a first mounted position thereof wherein it is at least partially nested in said trough pooling space to at least another mounted position wherein said reservoir is located clear of said trough pooling space so that if a transfer of {HEAD ~ feed material} from said reservoir to the pooling space be effected to pool feed material in the trough, an animal has feeding {TAIL ~ acccess} to pooled feed material in the trough; and 
means for mounting the reservoir on the trough so that it can be moved from a first mounted position thereof wherein it is at least partially nested in said trough pooling space to at least another mounted position wherein said reservoir is located clear of said trough pooling space so that if a transfer of { HEAD ~ feed material } from said reservoir to the pooling space be effected to pool feed material in the trough , an animal has feeding { TAIL ~ acccess } to pooled feed material in the trough ; and
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