Phytase 첨가가 임신돈과 포유돈의 분뇨 배설량 및 질소와 인 배설량에 미치는 영향
The Effect of Dietary Phytase on Nitrogen and Phosphorus Excretion of Gestating and Lactating Sows
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본 시험은 임신돈과 포유돈의 phytase 첨가 유무에 따른 섭취량, 분뇨 배설량 및 질소와 인의 섭취량과 배설량을 조사하기 위해 수행하였다. 본 시험에서는 3원 교잡종(Yorkshire×Landrace×Duroc) 임신돈 12두와 포유돈 12두를 공시하였다. 처리구는 phytase의 첨가 유무(0, 750 FTU/kg)에 따라 임신돈 2 처리구, 번식돈 2처리구로 나누고, 처리구당 6반복, 반복당 1두씩 나누어 각각 12두씩 총 7일 동안 수행하였다. 시험개시시 임신돈과 포유돈의 체중은 각각 208.9±13.8kg과 190.5±22.9kg 이었다. 임신돈의 경우, 사료의 섭취량은 phytase 첨가구에서 높았으며(P<0.05), 음수량과 총 배설량은 phytase 첨가 유무에 따른 차이가 없었다. 포유돈의 경우, 사료 섭취량과 음수량 및 총 배설량은 임신돈과 마찬가지로 처리구 사이에서 차이가 없었다. 임신돈의 질소 섭취량은 phytase 첨가구에서 높게 나타났으며(P<0.05), 질소 배설율은 phytase 첨가구에서 낮게 나타났으나, 유의차는 보이지 않았다(P>0.05). 포유돈의 경우, 질소의 섭취량과 배설량, 배설율은 처리구간 유의적인 차이가 없었다. 임신돈의 인 배설량과 배설율은 phytase 첨가구에서 크게 감소하였다(P<0.05). 포유돈의 경우, 인의 섭취량과 배설량 phytase 첨가구에서 높게 나타났으나, 유의적인 차이는 없었으며(P>0.05), 인 배설율은 phytase 첨가구에서 무첨가구에 비해 낮았다(P<0.05). 따라서 임신돈과 포유돈 사료에 phytase 첨가는 인 배설량 감소에 효과가 있다.
Abstract
This study was carried out to investigate the effect of dietary phytase on nitrogen and phosphorus excretion of gestating and lactating sows(Yorkshire×Landrace×Duroc). Twelve gestating sows and twelve lactating sows were used in this study and were divided into 2 groups(1 control group and 1 treatment group, 6 replications/group) the control group was without phytase and the treatment group was fed with phytase(750 FTU/kg) in the diet, respectively. Body weights of gestating and lactating sows were 208.9±13.8kg and 190.5±22.9kg, respectively. In gestating sows, feed intake was greater in phytase fed group than the control (P<0.05), but water intake and total excretion were not different between the groups. In lactating sows, feed and water intakes and total excretion were not different between the groups. The N intake of lactating sows was higher in phytase fed group than control(P<0.05) but N excretion ratio was not different. In lactating sows, N intake and excretion and N excretion ratio were not significantly different between the groups. P excretion and excretion ratio in gestating sows decreased by phytase treatment (P<0.05) as compared to control. In lactating sows, N intake and excretion was not significantly different by added phytase(P>0.05). Finally, dietary addition of phytase decreased P excretion in feces of gestating and lactating sows.
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