ニワトリにおける水の摂取量とエネルギー代謝(ニワトリのエネルギー代謝特に飼料の熱量増加に関する研究-4-)
スポンサーリンク
概要
- 論文の詳細を見る
Studies on energy metabolism in chickens were carried out to determine the effect of variable liquid intake on energy metabolism at fasting and equalized feeding condition.Thirty ml and 70ml of water, and 70ml of isotonic saline solution and Ringer's solution at 40°C per kg0.75 of body weight were injected into the crop sacs of birds, which had been abstained from feed for 40 hours and from water for 16 hours. Then, respiration exchange was measured three times at 11/2 hours after injection. A control experiment without water was also carried out under similar conditions. The ingestion of 30ml of water per kg0.75 of body weight had no influence on basal metabolic rate. But, when 70ml of water, isotonic saline solution and Ringer's solution were injected, the basal metabolic rate measured for 41/2 hours ingestion showed the significant increase. No difference, however, was observed among three kinds of ingested liquids. The amount of water excreted 41/2 hours after ingestion was nearly 95 per cent of the injected water, and as for insotonic saline solution and Ringer's solution, only 35 per cent of the injected amount was excreted.And then, the heat increment as affected by injected amounts of water and Ringer's solution was determined. When both liquids were given at a level of 30ml per kg0.75 of body weight, the increment kept going on for about 10 hours and the values expressed as per ml of liquids were 0.03 to 0.04 kcal. But, when 70ml per kg0.75 of body weight was given, the increment kept going on for about 15 hours and the value measured was 0.5 kcal per ml of liquids. In the experiment of the effect of variable water intake on feed energy utilization on the condition of equalized feeding, birds received 2.5g, 1.5g and 1.0g of water per gram of feed. Two and a half gram of water per gram of feed was approximately equivalent to ad libitum water intake. Restriction of water had no effect on digestibility of nitrogen, carbon balance and metabolizable energy of feed. Nitrogen balance significantly decreased under the restriction of water, compared with in the case of 2.5g of water pergram of feed.As caluculated from nitrogen and carbon balance, retention of protein decreased under the restriction of water, and on the other hand retention of fat increased, and consequently the retention of energy was not influenced. Therefore, no variation was observed in the heat production and heat produced for ingested energy under the restriction of water. In the case of both 1.5g and 2.5g of water per gram of feed, the heat increment value resulting from adding water was only 0.04 kcal per ml of water.
- 社団法人 日本畜産学会の論文