早期離乳仔牛における自由採食量と血液代謝像

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タイトル別名
  • Voluntary Food Intake and Blood Metabolite-Profile in Early-Weaned Calves
  • ソウキ リニュウ コウシ ニ オケル ジユウ サイショクリョウ ト ケツエキ

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In order to examine the mechanisms involved in the regulation of food intake in calves before and after early weaning, two experiments were done in a similar manner using Holstein male calves of about one week of age.Eighteen (in Expt.1) and fourteen (in Expt.2) animals, repectively, were divided into two groups.600g of milk-replacer were given per head per day to one group, and 300g to the other, for five weeks in both experiments.Pelleted concentrate and rice straw were given ad libitum to all calves from the start of each experiment, and consumption of this solid food, blood pH and serum concentrations of glucose, free fatty acids (FFA) and urea-nitrogen (BUN) were determined every week for ten weeks in each experiment.The results obtained are as follows: 1) The average daily concentrate intake increased from ca.0.1% of body weight in the 1st week to ca.3.3% in the 10th week of both experiments, showing a remarkable increase in the 4th week and two weeks immediately after weaning.2) The average daily intake of rice straw increased from ca.0.05% to ca.0.5% of body weight in ten weeks, but the only noticeable increase was observed in the 3rd week in both experiments.3) The daily intake of concentrate during suckling was higher in the group given 300g milkreplacer per head per day, but there was little difference between the groups in the consumption of concentrate after weaning or of rice straw throughout the experiment.4) The blood pH of both groups in Expt.1 increased at the end of the 3rd week and after the end of the 7th week, but no definite tendency was detected in Expt.2.5) Blood glucose concentration tended to be higher in calves fed 300g milk-replacer per day.It decreased at the end of the 3rd week, and increased after weaning in both groups of each experiment. 6) The concentration of FFA decreased markedly at the end of the 3rd week, then increased up to the end of the 6th week, and again decreased at the end of the 7th week. The BUN concentration, which was highest at the end of the 1st week, decreased steadily until weaning, and in Expt.2, it increased temporarily at the end of the 7th week. These results are considered to support the energostatic theory as the main mechanism controlling food intake in calves before and after early weaning.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 58 (11), 946-953, 1987

    公益社団法人 日本畜産学会

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