Utilização de nutrientes e parâmetros de fermentação ruminal em ovinos recebendo dietas com altas proporções de palma forrageira (Opuntia ficus indica Mill)

Abstract

The experiment was driven with the objective to evaluating the effect of addition of effective fiber, non effective fiber or tannin to diets contends high percents of spineless cactus for ovines about bloat production, rumen general conditions, intake and, dry matter and nutrients digestibility and animals ingestive behavior. Four canullated wethers was used, with live weight around of 43,8  1,62 kg, distributed in Latin square (4x4). Each experimental period had duration of 20 days. Being 10 of adaptation to experimental diets and 10 to collect. The treatments consisted of a diet base composed by spineless cactus, corn and soybean meal (D1) and addition of effective fiber from tifton hay (D3), addition of non effective fiber of soy peel (D4) and addition of tannis to reduce the ruminal fermentation (D2). The dry and organic matter intake in kg/day,% of PV and in relation to the PV0,75, and crude protein, ether extract, total carbohydrathes and total nutrients digestive, expressed in kg/day, were not influenced by the treatments, presenting medium values of 1,21; 60,91;70,36; 2,75; 1,04; 2,43; 62,07; 0,14; 20,81; 0,90 and 0,79, respectively. To example of the intake, dry and organic matter digestibility, crude protein, ether extract and the nitrogen balance (Nretained/Nabsorpted) expressed in percentages, it was not influenced by theexperimental treatments presenting medium value of 69,73; 74,29; 67,59; 62,18 and 79,06%, respectively. The bloat dynamics occurrence was influenced by the addition of acid tannis presenting values of 1,25 mm for foam production and 1,9 mg/mL for biofilm production even so the division of the nitrogen in the flowing ruminal didn't obtain difference. The pH, the concentration of ammonia nitrogen and the total production of volatile fatty acids were influenced by the diets presenting larger production of acids (175,55 mol/mL) and smaller pH value (6,18) for the fluids of the ovines fed with soy peel and larger ammonia production (7,51 mg/100mL) for fed them with tifton hay. The time of feeding went equal to every animals, even so the time of rumination went larger for the animals than they received hay, presenting value of 375 min/dia. Diets with discharges proportions of spineless cactus cause bloat production in ovines, just influencing in the consumption and digestibility of FDN, however the addition of approximately 15% of food of digestibility slower ruminal than the palm, reduces that effect, besides increasing the time of rumination.