Thirty-nine weanling rabbits (New Zealand x English spot;30 days of age) were used in a fourweek trial to evaluate the partial replacement of wheat grain for Leucaena leaf meal (Leucaena esculenta; LEU) on performance, carcass dressing percentage, and organ weights in fattening rabbits. Treatments consisted of partial replacement of wheat for 0%, 7.5%, or 15.0% of LEU in growing-finishing diet for fattening rabbits. Partial replacement of wheat grain with increasing levels of LEU did not influence (P>0.10) performance, carcass dressing percentage, and internal organs weights. It is concluded that this feeding strategy might contribute to reduce the food for feed competition while improving the use of locally available forage resources for rabbit production in warm environments with multidimensional poverty.
The effect of adding arginine to the diet on the endogenous amino acids (AA) loss in pigs under heat stress (HS) was evaluated. Twelve pigs (25 ± 2.6 Kg) cannulated in the distal ileum were used. There were three treatments: thermal neutral pigs fed a basal semi-purified diet (TN-B); HS pigs fed the basal diet (HS-B); HS pigs fed the basal diet added with 0.20% free Arg (HS-Arg). Pigs were adapted to the diets for 5 days followed by 2 days of ileal digesta collection (12 continuous hours, 0700 to 1900). The endogenous loss of all essential AA was lower (P < 0.001) in the HS-B pigs than in the TN-B or the HS-Arg diet. These data show that HS negatively affects the loss of endogenous AA, and indicate that Arg in the diet helps to counteract that effect.
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