In his journal, Crusoe describes his first attempt at domesticating a goat in December of his first year on the island:
                   … by nursing it so long it grew tame, and fed upon the little 
                  green at my door, and would not go away: This was the first 
                  time that I entertain’d a thought of breeding up some tame 
                  creatures, that I might have food when my powder and shot 
                  was all spent. (Defoe 72)
After this first attempt, he does act on these thoughts, emanating from his necessity to fend for himself, after his supply of ammunition has depleted.