This study was analyze the causes of mortality to be used as basic data to fine ways to reduced the mortality rate of stocked Holstein calves. This study was used on 917 Holstein calves stocked at a fattening farm. Of the 917 stocked calves, the head of mortality was the 33 and a calf mortality rate was 3.6 %. A results of investigating the caused of mortality by disease, respiratory disease was 17 heads (51.52%), digestive disease was 12 heads (36.36%), other diseases was 3 heads (9.09%), and accidental death was 1 head (3.03%), major caused of calf mortality was resporatory and digestive disease acoounted for 87.9% of all. A head of mortality was 30 (90.91%) when the number of transports until stocking 2 times over compared with 1 time. Season has a significant effect on calf mortality, with calves in winter experiencing the highest (13 heads, 39.39%) mortality compared to other seasons. Comparing mortality rates based on stocking age, the highest (13 heads, 39.39%) mortality rate was observed in calves stocked at under 90 days of age, compared to other age groups. Comparing mortality rates based on the feeding age, the highest (18 heads, 54.54%) mortality rate was observed in calves fed for under 60 days, compared to those fed for over 60 days and other feeding age groups.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 시험 동물 및 시험 설계
    2. 시험 사료 및 사양관리
    3. 조사 항목
Ⅲ. 결과 및 고찰
    1. 송아지 폐사율 조사
    2. 송아지 질병 원인별 폐사율 조사
    3. 송아지 입식을 위한 수송 횟수별 폐사율
    4. 입식 송아지 계절별 폐사율
    5. 송아지 입식 일령에 따른 폐사율
    6. 송아지 입식 후 사육 일수에 따른 폐사율
Ⅳ. 요약
사사
Ⅴ. 참고문헌

• 김성일(국립경국대학교 동물생명공학과 교수) | Sung Il Kim (Professor, Department of Animal Biotechnology, Gyeongkuk National University, Yecheon 36830, Korea)
• 김도형(국립경국대학교 동물생명공학과 교수) | Do Hyung Kim (Professor, Department of Animal Biotechnology, Gyeongkuk National University, Yecheon 36830, Korea)
• 명정환(대한사료 연구원) | Jeong Hwan Myung (Researcher, Daehan Livestock & Feed Co., Ltd, Incheon 22300, Korea)
• 정근기(목산한우연구소 연구소장) | Keun Ki Jung (Chief researcher, Moksan Hanwoo Research Institute, Gyeongsan 38507, Korea)
• 이수협(한국농수산대학교 교수) | Su Hyup Lee (Professor, Korea National University of Agriculture and Fisheries, Jeonju 54874, Korea)
• 박용수(한국농수산대학교 교수) | Yong Soo Park (Professor, Korea National University of Agriculture and Fisheries, Jeonju 54874, Korea)
• 이지홍(국립경국대학교 동물생명공학과 교수) | Ji Hong Lee (Professor, Department of Animal Biotechnology, Gyeongkuk National University, Yecheon 36830, Korea) Corresponding author