1. Replacement of wheat bran with spineless cactus (Opuntia ficus indica Mill cv Gigante) and urea in the diets of Holstein x Gyr heifers.
- Author
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de Figueiredo Monteiro CC, Silva de Melo AA, Ferreira MA, de Souza Campos JM, Rodrigues Souza JS, Dos Santos Silva ET, de Paula Xavier de Andrade R, and da Silva EC
- Subjects
- Analysis of Variance, Animal Feed analysis, Animals, Body Weight drug effects, Body Weight physiology, Dietary Fiber administration & dosage, Dietary Fiber pharmacology, Digestion physiology, Energy Intake drug effects, Energy Intake physiology, Female, Linear Models, Opuntia chemistry, Proteins analysis, Urea chemistry, Urea pharmacology, Weight Gain drug effects, Weight Gain physiology, Animal Husbandry methods, Cattle growth & development, Opuntia metabolism, Urea metabolism
- Abstract
The aim of this study was to evaluate the replacement effect of wheat bran with spineless cactus and urea in heifers. Twenty-four heifers with an average initial weight of 185 ± 13 kg were used in this experiment. Four levels of spineless cactus corrected with urea and ammonium sulfate (9:1) were studied: 0, 33, 66, and 100 % replacement with wheat bran. Samples of feed, orts, and feces were analyzed to estimate the intake and digestibility of dry matter (DM) and nutrients. Indigestible neutral detergent fiber was used as an internal marker. The experiment was conducted in a completely randomized design. Dry matter, neutral detergent fiber, and total digestible nutrient intake demonstrated a quadratic effect (P < 0.05). Rumen degradable protein intake increased linearly (P < 0.05). The maximum DM digestibility was estimated to be 0.67 with a 43 % replacement. Crude protein and NDF digestibility increased linearly (P < 0.05). The total body weight gain and average daily gain decreased linearly with the replacement. Thus, it is practical to replace wheat bran with spineless cactus containing urea and ammonium sulfate up to 66 % in sugar cane-based diets.
- Published
- 2014
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