PURPOSE: A manufacturing method of a composition of livestock feed is provided to manufacture the composition of the livestock feed which enables to reduce the breeding unit costs of the livestock, and to have excellent meat quality and amount by mixing natural by-products which are easily obtainable in conventional artificial formula feed. CONSTITUTION: A composition of livestock feed includes: 12-14 weight% of sawdust； 6-8 weight% of rice bran； 3-5 weight% of wheat bran； 2-4 weight% of oil cake of rice bran； 5-7 weight% of curd residue； 25-27 weight% of snack foil； 19-21 weight% of crushed corn； 18.93-20.83 weight% of mixture containing crude protein, crude fat, crude fiber, coarse ash, calcium and phosphorus； 0.11-0.13 weight% of salt； and 0.04-0.05 weight% of fermenting agent. The manufacturing method of the livestock feed comprises: a step of obtaining dried by-products by removing foreign substances from the raw material and mixing； a step of obtaining a first mixture by mixing the dried by-products and curd residues； a step of crushing the first mixture； a step of cooling the crushed first mixture； a step of obtaining a second mixture by mixing, corn, fermenting agents, salt, and a mixture containing crude protein, crude fat, crude fiber, coarse ash, calcium and phosphors to the cooled first mixture； a step of removing foreign substances from the second mixture； and a step of mixing the second mixture and the mixture containing crude protein, crude fat, crude fiber, coarse ash, calcium and phosphorus.본 발명은 가축사료의 조성물 및 그 제조방법에 관한 것으로, 보다 상세하게는 가축사료의 품질을 개선하고, 이 사료를 먹고 자란 한우의 도체시 육질 및 육량의 등급이 우수하게 나올 수 있는 가축사료의 조성물 및 그 제조방법에 관한 것으로서, 톱밥: 12~14중량%, 쌀겨: 6~8중량%, 밀기울: 3~5중량%, 깻묵: 2~4중량%, 비지: 5~7중량%, 과자박: 25~27중량%, 파쇄 옥수수: 19~21중량%, 조단백질, 조지방, 조섬유, 조회분, 칼슘, 인이 함유된 혼합물: 18.93~20.83중량%, 소금: 0.11~0.13중량%, 발효제: 0.04~0.05중량%의 배합비로 혼합된 사료 조성물과, 자연 건조된 톱밥, 쌀겨, 밀기울, 깻묵, 과자박에서 이물질을 제거하고, 이를 혼합하여 건조 부산물을 얻는 단계와； 상기 건조 부산물에 비지를 혼합하여 제1 혼합물을 얻는 단계와； 상기 제 1혼합물을 그 내부 중심에 파쇄부가 형성된
