The objective of this study was to evaluate the effect of different dietary corn levels in Total Mixed Rations (TMR) on growth and meat quality of castrated Korean black goats. For feeding trials, thirty-two castrated Korean black goats with similar age (average of 3 months) and body weight (average of 15.9 kg) were divided into the following four treatment groups: commercial feed (control), TMR containing 15% of corn (T1), TMR containing 25% of corn (T2), and TMR containing 35% of corn (T3) in a randomized complete block design. Final body weight was the highest in T2 (58.9 kg), followed by that in control group (53.1 kg). Average daily gain (ADG) and total dry matter intake (TDMI) were also the highest in T2 (100.2 g and 1,346 g, respectively). However, feed conversion ratio (13.4) was the lowest in T2. Carcass weight and dressing percentage in T2 and T3 were higher than those in the control. For meat quality characteristics, crude fat content was the highest in T2 (6.54%). Cooking loss (15.2%) was the lowest in the control. However, the control had the highest flavor value (5.3%). Oleic acid (C18:l) and palmitic acid (C16:0) were the highest in T2 (48.6% and 22.4%, respectively). Stearic acid (C18:0) was the highest in T1 (14.5%). Unsaturated fatty acid was the highest in the control (58.8%), followed by that in T3 (58.2%), T2 (57.8%), and T1 (54.4%). These results indicate that TMR containing 25% of corn could improve the growth performance and meat quality of castrated Korean black goats
본 연구는 옥수수 사일리지를 이용하여 TMR 제조 시 배합시간에 따른 물리적 특성(Particle size, peNDF 및 laceration)의 변화를 조사하고, 반추위 내 in situ 건물분해율 및 비유중기 착유우의 유생산성에 미치는 영향을 조사하고자 수행되었다. TMR 시험사료는 동일한 원료를 이용하여 배합시간을 30분(T1구)과 50분(T2구)으로 제조하였다. Penn State Particle Size Separator (PSPS, 19 mm와 8mm 체)로 분리하여 입자크기의 분포를 분석한 결과 배합 시간이 30분(T1)에서 50분(T2)로 증가함에 따라 하층(<8mm)의 비율이 유의적으로 증가하였고(p<0.01), peNDF>8.0는 유의적으로 감소하였으며(p<0.01), 굵은 비율(≥1mm) 이 유의적으로 감소하였다(p<0.01). 반추위 내 in situ 건물 분해율은 모든 배양시간에서 처리구간 차이가 없었지만 24시간 배양에서 T1구에서 유의적으로 높게 나타났다. (p<0.01). 산유량은 처리구간 차이가 없었지만 유지방은 T1이 유의적으로 높게 나타났다(p<0.01). 본 연구 결과에서 옥수수 사일리지 위주의 TMR 제조 시 배합시간을 단축 조절함으로서 산유량 및 유성분에 대한 부정적 영향 없이 조사료의 물리적 사료가치를 증진하는데 효과가 있을 것으로 기대된다.
This study was carried out to evaluate the physical characteristics of total mixed rations (TMR) prepared in Korea for improving productive effectiveness of dairy and beef cattle. The 40 samples of commercial TMR for dairy and beef cattle in 6 municipals were collected and analyzed for chemical composition and physical properties. There were significant regional differences (p<0.05) in dry matter and crude protein contents of TMR for dairy and beef cattle. In roughage value index (RVI), neutral detergent fiber (NDF) content, and physically effective NDF (peNDF)1.18 content, there were no regional differences in TMR for dairy cattle, but there were significant regional differences (p<0.05) in TMR for beef cattle. Thus the results from this study support that because RVI, NDF content, and peNDF content in TMR for dairy and beef cattle exceeded recommended ranges, a little adjustment in TMR for dairy cattle will be necessary to obtain optimal productivity.
본 연구는 섬유질배합사료의 조단백질 수준이 임신초기 흑염소의 사료섭취량, 영양소 소화율 및 질소 축적율에 미치는 영향을 조사하여 임신흑염소의 적정 조단백질 수준을 구명하기 위하여 실시하였다. 공시축은 임신초기흑염소 12두를 4처리구(관행사료구, 조단백질 10, 12 및 15%)로 나누어 처리구당 3두씩 대사케이지에 완전임의 배치법으로 배치하여 시험을 실시하였으며 그 결과는 다음과 같다. 섬유질배합사료의 일반 조성분은 건물 함량이 를 나타내었고, ADF와