Relationships among starch intake and fecal characteristics in fattening Japanese Black steers

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  • 黒毛和種去勢肥育牛におけるデンプン摂取量と糞性状との関係
  • クロゲワシュ キョセイ ヒイクギュウ ニ オケル デンプン セッシュリョウ ト フン セイジョウ ト ノ カンケイ

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Abstract

<p>We conducted two experiments to investigate the relationships among starch intake, feces starch and fecal pH in fattening Japanese Black steers. In experiment 1, 18 steers were observed at the ages of <tt>12</tt> and <tt>15</tt> months. The steers were fed <tt>5.2, 7.8</tt> kg of concentrate and <tt>3.1, 1.5</tt> kg of roughage on a dry matter basis at the age of <tt>12, 15</tt>months, respectively. In experiment <tt>2, 15</tt> steers were observed at the ages of <tt>25</tt> and <tt>28</tt> months. The steers were divided into three groups; six steers were fed <tt>5.1, 5.3</tt> kg of concentrate A <tt>(</tt>consisting of <tt>50</tt>% ground corn grain<tt>)</tt> and <tt>5.4-4.8</tt> kg of corn silage <tt>(</tt>ConA<tt>･</tt>CS group<tt>)</tt>, six steers were fed <tt>4.8, 5.1</tt> kg of concentrate B <tt>(</tt>consisting of <tt>40</tt>% ground brown rice<tt>)</tt> and <tt>5.7, 4.9</tt> kg of corn silage <tt>(</tt>ConB<tt>･</tt>CS group<tt>)</tt>, and three steers were fed <tt>8.5, 8.8</tt> kg of concentrate A and <tt>1.6, 1.3</tt> kg of wheat straw <tt>(</tt>control group<tt>)</tt> at each observation period, respectively. In experiment 1, the ratios of starch intake to dry matter intake <tt>(</tt>DMI<tt>)</tt> for steers at the ages of <tt>12</tt> and <tt>15</tt> months were <tt>28.8</tt> and <tt>36.8</tt>%, respectively. However, feces starch and fecal pH did not differ at the two ages. In experiment <tt>2</tt>, the ratios of starch intake to DMI were <tt>41.3</tt>, <tt>38.3</tt> and <tt>38.8</tt>%, the feces starch levels were <tt>10.9</tt>, <tt>14.1</tt> and <tt>6.8</tt>% and the fecal pH were <tt>6.09, 5.81</tt> and <tt>6.31</tt>, respectively, in the ConA<tt>･</tt>CS group, the Con B<tt>･</tt>CS group and the control group. The correlation coefficients between fecal pH and feces starch, and between fecal pH and the dry matter ratio of feces, were <tt>-0.44</tt> and <tt>-0.47</tt>, respectively <tt>(</tt>p<0.01<tt>)</tt>. These results indicate that lower fecal pH is correlated with higher feces starch, and suggest that excessive flow of starch from the small intestine increase hindgut fermentation and feces pH decrease.</p>

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