Effects of Obatanpa (A Quality Protein Maize) with Little or No Fishmeal Diets on the Growth Performance and some Carcass Characteristics of Finisher Pigs


A total of 36 Large White finisher pigs with a mean initial weight of 50.5 kg were randomly assigned to six dietary treatments (i.e. Control, Obat-1, Obat-II, Obat-Ill, Obat-IV and Obat-V) on the basis of weight, sex and litter origin. Thd diets contained 60% normal maize (Okomasa) in the Control and a similar level of Obatanpa (A Quality Protein Maize) in the Ohat- 1, Il, 111 and IV diets. The level of Obatanpa was increased to 97.9% in the Ohat-V diet. Fishmeal levels were gradually reduced from 4% in the Control to 3, 2. 1, and 0% respectively in the 5 Obatanpa-containing diets. Each treatment, replicated twice, consisted of a group of 3 pigs i.e. a barrow and two gilts. The experimental design adopted was the Completely Randomised Block Design. The pigs assigned to the 6 dietary treatments were observed over two phases, i.e. Phase I (50-70kg) and Phase 11 (70-80kg) during which each pig was allowed 2 and 2.5 kg diet respectively. The overall mean durations of the experiment for the various treatments were similar (P>0.05). Pigs fed the Ohat-Ill, IV and V diets recorded poorer (P<0.05) feed conversion efficiencies. No significant (P>0.05. differences were observed in terms of the feed cost/kg weight gain for pigs on the Control. Ohat-Il. III and IV diets. While pigs led the Obat-I diet required less (P<0.05) money to gain a unit weight than the Control. the pigs fed the Ohat-V diet proved to be more (P<0.05) expensive to feed than all the other dietary treatments. Pigs fed the Obat-V diet had a lower (P<0.05) loin eye area than the other treatments but there was no significant (P>0.05) difference in the mean hackfat thickness values of the pigs on all the 6 dietary treatments. Animals on the Obat-V diet also recorded higher (P<0.05) warm and chilled dressing percentages. It was concluded that though the inclusion of Obatanpa in pigs diets can confer significant economic benefits, Obatanpa, when used as the only source of protein in the diets of finisher pigs, might cause financial loss to the pig farmer in view of the inferior growth performance, economy of gain and carcass traits that may be encountered.



Okai, D. B. (Department of Animal Science, Professor, dbokai.agric@knust.edu.gh,


Nyannor, E. K. D.

Osafo, E. L. K. (Department of Animal Science, Associate Professor, elkosafo.agric@knust.edu.gh, 0322060325)

Amankwah, A.


Place of publication:

This article is in publication by the Department of Animal Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

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