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on growth and feed efficiency before weaning were studied in a trial comprising two parts. Two different diets (C, Ta), containing 160 or 95 g tallow, 90 or 53 g coconut oil, 0 or 50 g tricaprylin, 250 or 269 g protein, 22.2 or 20.8 MJ gross energy per kg dry matter, were prepared. The different protein and energy contents of the 2 diets were due to the flotation of part of the lipids in the case of diet Ta. Part 1 involved 50 male Limousin or Romanov x Limousin preruminant lambs, used in two replicates, each comprising 2 series of energy (obtained by indirect calorimetry) and nitrogen balance at 2 or 5 weeks (first replicate, series 1 and 2), or at 2, 4 or 6 weeks (second replicate, series 3 and 4). Part 2 was a feeding trial involving 51 Limousin and Romanov x Limousin preruminant lambs, used in two replicates. Growth rates and feed efficiency were obtained between 10 and 35 days. The nitrogen digestibility was higher in 5-week-old lambs who were fed diet Ta, or for all the lambs fed diet Ta taken together (P < 0.05). Respective digestibilities of energy and nitrogen increased from 95.5 to 98.3% and from 97.0 to 98.3% between the second and the sixth week of age (P < 0.025). A higher protein efficiency (P < 0.05), and a higher level of nitrogen balance (P < 0.005) of the same magnitude at all ages (+14 to +25%) were obtained in lambs who were fed diet Ta. Efficiency of ME utilization for energy (k , = 0.72), protein (k p = 0.62), or lipid (k = 0.87) deposition and maintenance requirements (MEm = 411 to 451 KJ kg1 (W °. d) were not altered by the type of diet. Those results were discussed in relation to the respective effects of tricaprylin, carbohydrates and protein contents of the diet.

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Combined effects of tricaprylin, coconut oil and amount of lipid, carbohydrate and protein on the digestibility of a milk replacer offered to the preruminant lamb and on energy and nitrogen balance