Níveis de grão de capim-pé-de-galinha (Eleusine coracana) em dietas para ovinos: consumo e digestibilidade

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Abstract

Objetivou-se avaliar em ovinos o consumo e a digestibilidade de nutrientes de dietas contendo grão de capim-pé-de-galinha (Eleusine coracana). Foram utilizados 20 ovinos com peso vivo inicial de 18,90 kg, em delineamento inteiramente casualizado, com cinco tratamentos e quatro repetições. Os animais foram alimentados com dietas isoprotéicas formuladas com 50% de volumoso e 50% de concentrado contendo 0; 16,0; 32,5; 48,0 ou 67,0% de grão de capim-pé-de-galinha em substituição ao fubá de milho. Utilizou-se a fibra indigestível em detergente neutro (FDNi) como indicador para estimativa da excreção fecal. Os níveis de grão de pé-de-galinha não influenciaram os consumos de MS, NDT e FDN. Os valores médios de consumo de matéria seca foram de 1,2 kg/animal/dia e 3,2% do peso vivo. O coeficiente de digestibilidade da matéria seca (CDMS) e o NDT reduziram linearmente em 0,1425 e 0,1612%, respectivamente, a cada 1% de grão de capim-pé-de-galinha no concentrado, o que está relacionado aos maiores teores de FDN e FDNi desse alimento. Os coeficientes de digestibilidade de MO e FDN apresentaram valores máximos de 57,64 e 53,60% nos níveis de 42,36 e 39,56% de grão de capim-pé-de-galinha no concentrado. Os valores médios de digestibilidade aparente de PB e EE foram 56,90 e 66,86%, respectivamente. A substituição do fubá de milho por grão do capim pé-de-galinha na dieta de ovinos não influenciou o consumo de matéria seca dos nutrientes, mas reduziu o coeficiente de digestibilidade da matéria seca, da matéria orgânica, dos carboidratos totais e os nutrientes digestíveis totais, logo, esse ingrediente pode substituir até 50% do fubá de milho no concentrado para ovinos.

Translated abstract

The objective was to evaluate in sheep the intake and apparent digestibility of nutrients diets containing finger millet grain (Eleusine coracana). Twenty lambs were used with average initial 18.90 kg BW, in a completely randomized design, with five diets and four replications. The animals were fed isoprotein diets formulated with 0.0, 16.0, 32.5, 48.0 e 67.0% of finger millet grain in substitution of corn meal, with 50:50 forage to concentrate ratio (%DM). The levels of finger millet grain did not affect the intake of DM, TDN and NDF. Dry matter intake was 1.2 kg/anim/d and 3.2% of BW. The coefficient of apparent digestibility of DM and NDT linearly decreased in 0.1425 and 0.1612%, respectively, for each 1% of finger millet grain in the concentrate, which is related to higher levels of NDF and NDFi in this feed. The digestibility coefficients OM and NDF showed maximum values of 57.64 and 53.60% in the levels of 42.36 and 39.56% of finger millet grain in the concentrate. Apparent digestibility of CP and EE were 56.90 and 66.86% respectively. The replacement of corn meal per finger millet grain in the diet of sheep does not affected dry matter intake of nutrients, but reduced the digestibility of DM, OM, total carbohydrates and TDN. Then, this ingredient could replace up to 50% of corn meal in the concentrate for sheep.

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Most cited references 22

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Predicting intake and digestibility using mathematical models of ruminal function.

D Mertens (1987)

Intake and digestibility of feeds by ruminants are influenced by characteristics of the feed, animal and feeding situation. Integration of these characteristics in mathematical models is critical to future progress in forage evaluation and optimal formulation of diets for ruminants. The physiological and physical theories of intake regulation can be described by simple mathematical equations. These equations indicate that intake is a linear function of animal characteristics, such as body weight and production level, and a reciprocal function of feed characteristics, such as fill effect and energy content. Theoretical equations were developed to predict intake when the neutral detergent fiber and energy content of the diet and the energy requirements of the animal are known. The theoretical model also can be used to predict the maximum intake that will maintain a given level of animal production by solving the physiological and physical intake equations at their intersection. Psychogenic intake regulation, which is related to the animal's behavioral response to factors not related to physiological or physical characteristics, can be described mathematically as a multiplier. Digestibility can be predicted by summing the contents of ideal nutritive entities in feeds, which have true digestibilities near 100%, subtracting their associated endogenous losses and adding the variable digestible fiber content. Steady-state models indicate fractional rates of digestion and passage can be used to define ideal nutritive entities and predict digestibility over a range of kinetic characteristics. The steady-state solutions are particularly useful in understanding and predicting the depression in digestibility associated with changes in rates of passage at high levels of feed intake.