Ukutya kweenkukhu kufuneka kunikeze iprofayili elungeleleneyo yee-amino acids ezibalulekileyo ukuxhasa ukukhula okukhawulezayo kunye nophuhliso. I-Lysine, i-methionine, kunye ne-threonine ziphakathi kwezona zibalulekileyo, njengoko zinefuthe ngokuthe ngqo kwi-protein ye-muscle ye-muscle kunye ne-feed conversion ratios. I-Methionine, ngakumbi, sisithintelo se-amino acid kwisondlo senkukhu, okuthetha ukuba ukunqongophala kwayo kunokuthintela ukukhula nokuba ezinye izondlo zininzi. Ngokuncedisa nge-synthetic amino acids, abavelisi banokuqulunqa ukutya okuhlangabezana ngokuchanekileyo neemfuno zesondlo zeentaka ngaphandle kokuxhomekeka kakhulu kwimithombo yeprotheyini enexabiso eliphezulu efana nokutya kweembotyi zesoya okanye intlanzi. Oku akunciphisi iindleko zesondlo kuphela kodwa kucutha nokukhutshelwa kwenitrogen, nto leyo enegalelo kwiindlela zokulima ezizinzileyo.