Abstract
This experiment was conducted to evaluate the effects of feldspar on growth performance and body composition in broiler chicks. A total of 120 one-day old 'Ross' broilers were assigned to 5 treatments in a completely randomized design. The five dietary treatments were control, antibiotic(0.05% chlortetracycline), feldspar 0.5, 1.0, 1.5% diets. The weight gain of broilers fed a diet containing 1.5% feldspar (2,088 g) was significantly (P<0.05) higher than control (1,888 g). The feed intake was significantly increased in feldspar treatments compared to that of the control (P<0.05). However, feed conversion ratio was significantly increased in 1.0% feldspar treatment compared to that of the control (P<0.05). The moisture and protein contents of meat were significantly increased in 1.0% feldspar treatment (75.69 and 15.22%) compared to that of the control (73.38 and 9.80%). However, the crude fat content of meat was reduced in feldspar treatments compared to control and antibiotics treatments (P<0.05). The TBA value of meat in feldspar treatments was significantly reduced compared to that of the control (P<0.05). The plasma cholesterol content was 129 mg/dL in 0.5% feldspar and 134 mg/dL in 1.0% feldspar treatments, which were significantly higher (P<0.05) than that of the control (103 mg/dL).
본 연구는 장석의 첨가가 육계의 성장 및 체조성에 미치는 영향에 대해 연구하였다. 공시동물은 Ross broiler 120 수로 5 처리 4 반복 반복당 6수씩 사양시험을 실시하였다. 처리구는 대조구, 항생제 첨가구, 장석 0.5, 1.0, 1.5% 첨가구로 배치하였다. 6주간의 사육시험 결과에서 증체량은 장석 1.5% 첨가구가 각각 2,088 g으로 가장 높게 나타났으며, 사료 섭취량 역시 장석 첨가구인 1.5% 첨가구가 3,678 g으로 대조구 3,243 g보다 높은 섭취량을 보였다(P<0.05). 사료 요구율은 장석 1.0% 첨가구가 1.80으로 높았으며, 대조구가 1.69으로 가장 낮아 통계적인 유의차를 보였다(P<0.05). 도체의 체조 성 분석에서 조지방 함량은 대조구가 15.44%으로 가장 높았으며, 장석 0.5% 첨가구가 7.29%으로 낮은 함량을 보였다(P< 0.05). 도체의 TBA 는 대조구가 $0.35{\mu}mol/100g$으로 가장 높게 나타났으며, 장석 0.5%, 1.0% 및 1.5% 첨가구는 각각 $0.13{\mu}mol/100g$으로 낮게 나타나 통계적인 유의차를 보였다(P< 0.05). 혈중 cholesterol 함량은 대조구 103 mg/dL 보다 장석 1.0 % 첨가구에서 134 mg/dL로 높은 수치를 보였으며, 통계적으로 유의차가 있었다(P<0.05).
