Influence of metabolizable energy content of the diet and of feeding level on lamb performances 2. utilization of metabolizable energy for growth and fattening

Theriez, M.; Castrillo, C.; Villette, Y.

Livestock Production Science 9(4): 487-500

1982


ISSN/ISBN: 0301-6226
DOI: 10.1016/0301-6226(82)90053-7
Accession: 005687906

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Abstract
Metabolizable energy utilization efficiency (Kpf) was determined in 2 trials on 60 early weaned lambs by the comparative slaughter technique. The lambs were fed diets with varying ME content offered ad lib or in limited amounts. The Kpf values obtained during the 1st trial with 30 Berrichon (Romanov .times. Limousine) male lambs were lower than the corresponding Kf values calculated from diets composition, but differences were small. In the 2nd trial conducted on 30 Ile de France (Romanov .times. Limousine) lambs (12 males and 18 females) the Kpf values were very low (0.24-0.49) and very different from calculated Kf values. In both trials feeding level had no significant effect on Kpf. Relationships between Kpf values and diet characteristics (crude fiber, CF, crude protein, CP, content and metabolizability q) and body gain composition (percentage of retained energy as protein PE/TGE) were set up. The best relation had a correlation coefficient r = 0.92 and RSD = 0.040. Sources of error in Kpf determination are discussed. When this relationship is applied to different published data, the results are very close to those reported here.