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Evaluation of feedstuffs quality for pigs in Thailand 3. Use of apparent ileal crude protein and amino acid digestibilities of soybean, peanut and sesame meals in ration formulation for diets of growing finishing pigs  [2001]

Tartrakoon, W. Thinggaard, G. Tartrakoon, T. Chalearmsan, N. et al.

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In the first experiment, N balance was conducted using four growing and finishing pigs fed with four diets in two separate 4x4 Latin square design. For the second experiment, 16 crossbred barrows and gilts weighing 30 to 90 kg BW were allocated in a randomized complete block design to receive one of those four diets. Diet 1 (the control diet) was formulated with SBM based on its total protein and AA content. Diet 2, 3 and 4 were formulated with SBM, SBM + 10 percent PNM and SBM + 10 percent SM based on the apparent ileal digestibility of protein and AA in SBM, PNM and SM meals respectively. The results of N-balance experiments in growing pigs showed that the pigs fed diets 3 and 4 had significant (p0.05) lower total N-excretion (g pig/d) and urinary N : faecal N ratio than pigs fed diet 2. No significant difference (p0.05) to the control group. A direct relation between N-excretion and N-retention was found. The pigs fed diet 4 had the highest N-retention (p0.05). In finishing period, the pigs fed diets 3 and 4 tended to have a lower total N-excretion and urinary N : faecal N ratio than pigs fed diet 2, although there were no significant differences. The results of growth performance showed that although the pigs on diet 3 tended to have the lowest growth performance in growing period, throughout growing-finishing period, there were no significant differences (p0.05) in total feed intake, average daily gain and feed conversion ratio among treatment groups.
On the other hand, feed cost (Baht/kg weight gain) of the pigs on diet 3 was lowest (p0.05). The pigs from control group had lower dressing percentage than those fed diets 2 and 4 (p0.05) but it did not differ significantly from the pigs on diet 3. The result indicated that for the diets formulated with SBM as the only protein source, the use of apparent ileal CP and AA digestibilities in ration formulation tended to supply of total AAs in surplus. Use of apparent ileal CP and AA digestibilities in ration formulation for growing and finishing pig diets where part of the SBM is substituted for PNM or SM tended to have a better balance of AAs than the diets which were formulated with SBM as the only protein source. Although, the use of SBM and 10 percent PNM as protein sources in diets formulated based on apparent ileal AA digestibilities, threonine tended to be the limiting factor for productive response, the diets formulated using apparent ileal digestibility values of CP and AAs influenced the growth performance and economic returns of pigs positively.

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Thai Journal of Agricultural Science (Thailand)

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