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Revista Computadorizada de Producción Porcina Volúmen 7 Número 3 (2000)
and urine. The level of daily feed consumption was adjusted to 0.08 kg
DM/kg 0.75 and water was always available.
Tabla 1. Charcteristics of the diets (per cent in dry basis)
Refined sugar Jerusalem artichokes
Ingredients
Soybean meal 32.4 17.0
Refined sugar 62.9 -
Jerusalem artichokes - 77.5
CaHPO4.2H2O 2.6 2.6
NaCl 0.8 0.8
Vitamins and minerals 1
1.3 1.3
Analysis
DM 95.11 28.19
Ash 5.62 8.96
Organic matter 94.38 91.04
Crude fibre 3.66 10.34
N 2.40 2.39
Gross energy, kJoule/g DM 16.14 16.77
1 According to NRC (1998) recommendations
Faeces were collected from each pig every morning and stored frozen and then dried at
70 o C in an oven with air circulation. Urine was collected into polyethylene bottles
containing 40 mL of 5% sulphuric acid and sampled every day. The samples were kept
frozen and then thawed. The energy content of dry urine was determined in an adiabatic
bomb calorimeter by a modification of the method described by Nijkamp (1965). The
samples of pig urine were freeze-dried in polyethylene sheets over Petri dishes. The
content of N in the feed, fresh faeces and urine were determined by the macroKjeldahl
procedure (AOAC 1990), while energy was measured by heat combustion.
Means were contrasted by the analysis of variance technique according to a paired data ttest
(Steel and Torrie 1980). Data were evaluated through the Harvey (1990) software
procedure.
RESULTS AND DISCUSSION
General. During the entire trial, animals exhibited good health and no symptoms of
discomfort were observed. All animals were in positive weight balance. A high contrast
was observed in pigs fed either the sucrose based diet, as compared to the Jerusalem
artichoke based diet. In this later treatment, pigs used to eat the fresh, entire tubers during
a period of time, exhibiting a suis generis pattern of feed intake (Ly et al 1994). In some
cases, a small amount of feed refusal was observed from the diet formulated with
Jerusalem artichoke and soybean meal, thus determining a slight, near to be significant
(P