ホルスタイン種去勢育成牛の飼料利用性,第1胃内容液および血液性状に及ぼすサリノマイシン投与の影響

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Two feeding experiments were conducted to determine the effects of salinomycin (SL) on performance, and ruminal and blood characteristics in growing steers. Twenty two 3-month-old Holstein st10eers were fed on a concentrate diet and timothy hay (70: 30) for three months. In Exp. 1, steers were assigned into three groups, as follows; in Exp. 1: nonmedicated (control), and medicated with SL at 15ppm and 30 ppm (SL 15 and SL 30). Animals were fed individually by using electric feeding doors. In Exp. 2, the treatments were nonmedicated (control), and medicated with SL at 10ppm and 20ppm (SL 10 and SL 20), with 4 steers assigned to each treatment. The average daily gains (ADG) in steers of the SL 30 group tended to increase in comparison with the control (Exp. 1). The TDN intakes in all SL medicated groups tended to decrease by 4 to 6%, and the TDN conversions improved by 3 to 12%. There were no significant differences in ruminal pH or total VFA concentrations among treatments, but the molar percentages of acetate in rumen fluids decreased and propionate significantly increased via the SL medications in Exp. 1 (P<0.05). In Exp. 2, the VFA concentrations in the rumen showed similar changes to those of Exp. 1. The ruminal lactate concentrations tended to decline during the first month after SL feeding, then recover two or three months later. Ruminal NH3-N concentration in the SL 20 group was higher than that of the control throughout the experiment. No significant differences in blood metabolites among the groups were observed in the present experiment.

ホルスタイン種去勢育成牛の飼料利用性,第1胃内容液および血液性状に及ぼすサリノマイシン投与の影響

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