Abstract
본 연구는 규산염 광물질인 D Lite의 수준별 첨가가 육계의 사양성적, 영양소 소화율, 도체성상 및 육질에 미치는 영향에 대해 조사하기 위하여 평균 체중이 40 g인 육계(Ross종, 1일령) 640수를 공시하여 4처리 4반복 반복당 40두씩 완전임의 배치하였다. 각각의 처리구는 D Lite를 첨가하지 않은 무첨가 대조구, D Lite 0.15%, 0.30% 및 0.45% 첨가구로 나누고 전기(0~21일)와 후기(21~35일)로 나누어 총 5주간 사양 시험을 실시하였다. 시험 전 기간 동안 증체량 및 D Lite 0.15% 첨가구가 다른 처리구에 비해 증체량 및 사료 섭취량이 유의적으로 높게 나타났으며(p<0.05), 0.15% 이상의 수준에서는 증체량이 감소하는 것으로 나타냈다(p<0.001). 에너지 및 칼슘 소화율은 D Lite 0.15% 첨가구가 다른 처리구에 비해 유의적으로 높게 나타났다(p<0.05). 도체성상, 장기 무게 및 가슴살 성분에서는 전처리구 간에 유의적인 차이가 나타나지 않았다(p>0.05). 그러나 가슴살 TBARS 분석에서는 저장 8일째까지 전처리구간에 유의적인 차이가 나타나지 않았으나(p>0.05), 저장 12일째 D Lite 첨가구가 대조구에 비해 유의적으로 낮게 나타냈으며(p<0.05), D Lite 첨가 수준이 증가할수록 가슴살의 산패도 억제 효과가 나타나는 것으로 관찰되었다(p<0.05). 따라서 이러한 결과를 종합해볼 때, 육계 사료 내 D Lite 0.15% 첨가는 증체량 및 영양소 소화율을 개선시키며, D Lite의 첨가는 가슴살의 산패도 억제 효과가 있는 것으로 판단된다. An experiment was conducted to investigate the effects of dietary supplementation of a silicate mineral (D Lite) on growth performance, nutrient retention, carcass characteristics and meat quality in broiler chicks. A total of 640 broiler chicks were randomly allotted to four dietary treatments in a randomized complete block design. Each treatment had four replicates comprising 40 broilers in each replicate. Dietary treatments were as follows: control (0% D Lite), and diets supplemented with 0.15%, 0.30% and 0.45% of D Lite. The starter and finisher diets were fed from d 0 to 21 and d 21 to 35, respectively. Body weight gain during starter (p<0.05), finisher (p=0.057) and overall (p<0.001) experimental period and feed intake (p<0.05) during starter period decreased quadratically with increasing dietary D Lite levels. The birds fed 0.15% D Lite showed the greatest (p<0.05) overall weight gain, feed intake and retention of gross energy and calcium. There were no differences (p>0.05) in carcass characteristics, organ weights and breast meat composition. However, as the level of D Lite was increased in the diet there was a linear decrease in the TBARS values of breast meat (p<0.05) at d 12 of storage. These results suggest that D Lite supplementation at the level of 0.15% is shown to be effective in improving performance and nutrient retention in broilers.
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