Energy Metabolism of Calf

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
本文フルテキスト

Energy metabolism of growing calves was subjected to analyses on the basis of available data mainly obtained from more than 800 determinations on 178 Holstein calves investigated by the group of Feeds and Feeding Laboratory, Hokkaido University. Calves in preruminant stage efficiently utilized metabolizable energy (ME) provided they were supplied energy by liquid feed consisting of over 70% of their diet. The efficiency of utilization of ME by suckling and weaning calves was governed by the proportion of energy supply from liquid feed in a ration. Fasting heat production was 385 kJ/kg0.75・day for ruminant calves at 4 to 6 months of age. Heat production showed a seasonal variation with a greater intensity in younger calves. The digestibility of nutrients and metabolizability of energy were both influenced by the quantity and quality of roughage in a ration for calves. Thus, supplementary concentrate is essential, and an addition of 60% of the concentrate in a ration is recommended to achieve a satisfactory weight gain of calves less than 13 weeks of age. The efficiency of utilization of ME was 0.75 for maintenance and 0.5 to 0.6 for growth of young calves. Requirements of ME were estimated to be around 500 kJ/kg0.75 for maintenance and 510 to 520 kJ/kg0.75 for 1 kg of weight gain.

刊行年月日
作成者 Junjiro SEKINE Yasushi ASAHIDA
オンライン掲載日
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
24
2
開始ページ 141
終了ページ 148
言語 eng

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