Toharmat, T.
(Laboratory of Animal Feeding, Tokyo University of Agriculture)
,
Tanabe, S.
(Tohoku National Agricultural Experiment Station)
,
Kume, S.
(Department of Animal Nutrition, National Institute of Animal Industry)
,
Kameoka, K.
(Laboratory of Animal Feeding, Tokyo University of Agriculture)
An experiment was conducted to clarify the effects of dietary supplementation of monensin or salinomycin on mineral utilization of growing goats. Six goats weighing 10.54 kg initially were randomly assigned to treatments in a replicated $3{\times}3$ Latin square design. Treatments were a ...
An experiment was conducted to clarify the effects of dietary supplementation of monensin or salinomycin on mineral utilization of growing goats. Six goats weighing 10.54 kg initially were randomly assigned to treatments in a replicated $3{\times}3$ Latin square design. Treatments were a basal diet, basal plus 30 ppm monensin and basal plus 20 ppm salinomycin on a DM basis. The basal diet was a mixture of Italian ryegrass wafer, soybean meal, ground maize and $CaCO_3$ with DM proportions of 50, 13.76, 36 and 0.24%, respectively. Each period lasted for 21 days, and the apparent absorption and retention of minerals were measured during the last 7 days of each period. Salinomycin supplementation improved NDF digestibility and plasma glucose. The apparent absorption and retention of Ca, P, Mg, Na and K were not influenced by the treatments. The concentrations of plasma Ca, P, Mg, Na, K and Cl were similar in all treatments. The ionophore supplementation had no significant effect on acid excretion. The results suggest that 30 ppm monensin or 20 ppm salinomycin supplementation is not effective in improving the utilization of Ca, P, Mg, Na and K in growing goats fed a diet composed of the 50% concentrate.
An experiment was conducted to clarify the effects of dietary supplementation of monensin or salinomycin on mineral utilization of growing goats. Six goats weighing 10.54 kg initially were randomly assigned to treatments in a replicated $3{\times}3$ Latin square design. Treatments were a basal diet, basal plus 30 ppm monensin and basal plus 20 ppm salinomycin on a DM basis. The basal diet was a mixture of Italian ryegrass wafer, soybean meal, ground maize and $CaCO_3$ with DM proportions of 50, 13.76, 36 and 0.24%, respectively. Each period lasted for 21 days, and the apparent absorption and retention of minerals were measured during the last 7 days of each period. Salinomycin supplementation improved NDF digestibility and plasma glucose. The apparent absorption and retention of Ca, P, Mg, Na and K were not influenced by the treatments. The concentrations of plasma Ca, P, Mg, Na, K and Cl were similar in all treatments. The ionophore supplementation had no significant effect on acid excretion. The results suggest that 30 ppm monensin or 20 ppm salinomycin supplementation is not effective in improving the utilization of Ca, P, Mg, Na and K in growing goats fed a diet composed of the 50% concentrate.
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제안 방법
Analysis of variance of a replicated Latin square was used to analyze the effect of monensin or salinomycin supplementation. Treatment means were conpared by LSD and the significance was declared at p < 0.
Dried feed, feed refusals and fecal sauries were ground in a stainless steel mill through a 1-mm screen. Samples were analyzed for ash, fat and nitrogen, NDF and ADF. The concentrations of Ca, Mg, Na and K were determined by atomic absorption spectrophotometry and P was determined by a colorimetry procedure.
The chemical conposition of the basal diet is shown in table 1. The diet was formulated to meet requirement for TDN, protein and minerals (NRC, 1981) and was offered in two equal amounts at 09:00 and 15:00 hours each day. One gram of vitamins was mixed thoroughly with the feed immediately before feeding.
The goats were placed in the metabolism stalls located in a controlled-temperature room kq)t at 203 The animals were ad耳)ted to the experimental conditions for 2 weeks before the start of the experiment Each 21-day experimental period consisted of a 14-day preliminary period and a 7-day total collection period.
The beneficial effects of ionophore supplementation on the productivity of ruminants may encourage the application of ionophores in diets composed of various ranges of concentrate level. This experiment was designed to clarify the effect of 30 ppm monensin or 20 ppm salinomycin supplementation, which seemed to be appropriate amounts for ruminants, on mineral utilization of growing goats fed a diet composed of 50% concentrate.
성능/효과
The digestibility of ADF was not affected by monensin or salinomycin supplementation in the basal diet (table 2). The digestibility of NDF and plasma glucose measured three hours after feeding were significantly higher in goats fed the basal diet plus salinomycin than in the goats fed the basal diet only. Plasma glucose in goats fed the basal diet, basal diets plus monensin and salinomycin were as follows; 61.
The higher NDF digestibility in salinomycin treatment is likely accompanied by a shifted synthesis of acetate to propionate in the rumen which may account for the increase in plasma glucose. The results suggest that salinomycin supplementation in a diet with 50% concentrate may have similar effect on NDF digestibility with high or low concentrate diets.
후속연구
Supplemental monensin or salinomycin in growing goats fed a 50% concentrate diet had no effect on the utilization of Ca, P or Mg. Although the utilization of Ca, P and Mg in ruminants fed an ionophore may be influenced by a high level of concentrate or roughage, further study is needed to clarify the relationship between dietary concentrate level and ionophore in connection with Ca, P and Mg utilization.
However, the utilization rates of Na and K as well as the acid-base status of goats fed a 50% concentrate diet were not influenced by dietary supplementation of monensin or salinomycin. It is not clear whether the effectiveness of supplemental monensin or salinomycin on Na or K utilization is related to the level of concentrate in the diet Further study is necessary to identify factors affecting Na and K utilization in ruminants fed ionophores.
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