Relationships between neutral detergent fiber intake and chewing time in fattening Japanese Black steers.

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  • 黒毛和種去勢肥育牛における繊維摂取量と採食・反芻時間
  • クロゲワシュ キョセイ ヒイクギュウ ニ オケル センイ セッシュリョウ ト サイショク ・ ハンスウジカン

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Abstract

<p>The present study was conducted to investigate the relationships between neutral detergent fiber <tt>(</tt>NDF<tt>)</tt> intake and chewing time in fattening Japanese Black steers. In experiment <tt>1</tt>, <tt>18</tt> steers were observed at the ages of <tt>12</tt> and <tt>15</tt> months. The steers were fed <tt>5.2</tt>, <tt>7.8</tt> kg of concentrate and <tt>3.1</tt>, <tt>1.5</tt> kg of roughage on a dry matter basis at the age of <tt>12</tt>, <tt>15</tt>months, respectively. In experiment <tt>2</tt>, <tt>15</tt> steers were observed at the ages of <tt>20</tt>, <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>3.1-5.4</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>3.3- 5.7</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>1.0-1.6</tt> kg of wheat straw <tt>(</tt>control group<tt>)</tt> at each observation period, respectively. In experiment <tt>1</tt>, the NDF intakes from forage <tt>(</tt>FNDFI<tt>)</tt>, the ratios of FNDFI to dry matter intake <tt>(</tt>DMI<tt>)</tt> and the chewing times of steers at the ages of <tt>15</tt> months decreased as the increase of the concentrate intake. In experiment <tt>2</tt>, the FNDFIs were <tt>1.6</tt>, <tt>1.6</tt>, <tt>0.7</tt>kg/day, the ratios of FNDFI to DMI were <tt>17.5</tt>, <tt>17.2</tt> and <tt>7.6</tt>%, the chewing times were <tt>386</tt>, <tt>436</tt> <tt>289</tt> minutes/day, and the RVIs were <tt>60</tt>, <tt>62</tt>, <tt>46</tt> minutes/kgDM, respectively, in the ConA<tt>･</tt>CS group, ConB<tt>･</tt>CS group and control group. The correlation coefficients between chewing time and the ratio of NDFI to DMI, and between chewing time and the ratio of FNDFI to DMI, were <tt>0.28</tt> and <tt>0.51</tt>, respectively. These results indicate that the FNDFI and the ratio of FNDFI to DMI affect chewing time and RVI in the diets of fattening Wagyu steers</p>

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