[Effect of the replacement of a part of the tallow in a milk supply with tricaprylin or coconut oil on the use of energy and nitrogen by the preruminant calf].
The advantages of using caprylic acid in the feed of preruminant calf have been investigated and compared to those of coconut oil. Two trials were carried out. Trial 1 studied the effect on the appetence and digestibility of a conventional milk replacer when tricaprylin ( TC8 ) was substituted for one-half of the tallow in the replacer. Trial 2 investigated diet digestibility and energy and nitrogen balances in 3 groups of 6 Friesian male preruminant calves each, using two open-circuit respiratory chambers. Group 1 was fed a control diet based on skim-milk powder and tallow (diet 1). In group 2, 2/3 of the tallow was replaced by coconut oil (diet 2). In group 3, 1/3 of the tallow was replaced by coconut oil and the other 1/3 by TC8 (diet 3). Apparent digestibility of energy (94.4 vs 90.7%; P less than 0.05) and nitrogen (93.2 vs 89.7%; P less than 0.10) and energy metabolizability , q (91.6 vs 88.1%, NS) were higher with diet 2 than with diet 1. TC8 intake also favoured a higher apparent digestibility of energy (98.0 vs 92.9%; P less than 0.01) and nitrogen (96.9 vs 93.0%; P less than 0.001) in trial 1 but not in trial 2 where diet 3 had only a slightly higher apparent digestibility than diet 1 (92.9% for energy and 90.7% for nitrogen; P less than 0.10). Adjusted protein gains observed in trial 2 were 52.3 +/- 3.4, 58. 9b +/- 5.3 and 56. 5ab +/- 5.4 kcal/d/kg W0 .75, respectively, for each of the 3 diets; adjusted lipid gains were 66. 8a +/- 4.0, 59.6b +/- 4.2 and 61. 2ab +/- 6.7 kcal/d/kg W0 .75; and adjusted energy gains were 119.2 +/- 6.2, 118.4 +/- 6.1 and 117.5 +/- 6.6 kcal/d/kg W0 .75 (a, b = data with different superscripts are significantly different; P less than 0.05). Metabolizable energy (EM) efficiency for tissue deposition was of the order of 0.67 +/- 0.14, and maintenance requirements amounted to an average of 95 kcal EM/d/kg W0 .75.
D000596:Amino Acids / Q000097:blood; D000821:Animal Feed; D000818:Animals; D002210:Caprylates / Q000008:administration & dosage* / Q000378:metabolism; D002417:Cattle / Q000502:physiology*; D000074263:Coconut Oil; D004041:Dietary Fats / Q000008:administration & dosage* / Q000378:metabolism; D004734:Energy Metabolism; D008297:Male; D008892:Milk / Q000032:analysis; D009584:Nitrogen / Q000378:metabolism; D010938:Plant Oils; D014280:Triglycerides / Q000008:administration & dosage* / Q000378:metabolism
D000596:Amino Acids; D002210:Caprylates; D004041:Dietary Fats; D010938:Plant Oils; D014280:Triglycerides; C003637:tricaprylin; D009584:Nitrogen; D000074263:Coconut Oil
Influence du remplacement d'une partie du suif d'un aliment d'allaitement par de la tricapryline ou de l'huile de coprah sur l'utilisation de l'énergie et de l'azote par le veau préruminant.