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In Vitro-in Vivo Digestibility and Nitrogen Balance in Indigenous, Exotic and Crossbred Growing Pigs Fed Sprouted or Roasted Cowpea Diets

Article scientifique 2021 Anglais

Résumé

Abstract The study evaluated effects of processing cowpeas for inclusion in maize-based diets for Windsnyer, Large-White x Landrace, and their 3-way crossbred growing pig genotypes. In-vitro, the raw and roasted cowpea diets, sprouting cowpeas decreased (P<0.05) gastric-ileal non-enzymatic (buffer-only) DM digestibility. Roasting increased (P<0.05) the colon enzymatic digestion relative to sprouting. Total ileal and colon in-vitro diet DM digestibility were not affected (P>0.05) by cowpea processing. In-vivo, Pigs consumed most (P<0.05) feed (g/day/kg BW) in period 1, with significant (P<0.05) genotype X period interaction. Both roasting and sprouting cowpeas reduced (P<0.05) dietary apparent DM digestibility. Pig daily body weight (BW) gain reduced (P<0.05) in period 3 compared to period 1. There was no (P>0.05) treatment effect on feed conversion efficiency. The 3-way crossbred pigs excreted more (P<0.05) urine N (g/dayBW0.75). Urine N excretion (g/dayBW0.75) peaked (P<0.05) in period 2 (P<0.05), with less (P<0.05) N intake (g/dayBW0.75), faecal N excretion (g/dayBW0.75) and N balance (g/dayBW0.75) than in period 3. Significant diet X genotype interaction in faecal N excretion (g/dayBW0.75) resulted from markedly high (P<0.05) in contrast to low (P<0.05) excretion. Significant genotype X period interaction resulted from the numerically (P>0.05) higher urine N excretion. In conclusion, in-vitro, sprouting shifted non-enzymatic digestion to the colon, while roasting increased colon fibrolysis, without effect on overall DM digestibility. In-vivo, the period of feeding, interpreted to reflect pig maturity, the pig genotype and cowpea processing interacted to influence apparent dietary DM digestibility and N utilization, without significant effect on the conversion efficacy of the maize-cowpea diet.

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Lubisi, M., Fushai, F., Thomas, R., Baloyi, J. (2021). In Vitro-in Vivo Digestibility and Nitrogen Balance in Indigenous, Exotic and Crossbred Growing Pigs Fed Sprouted or Roasted Cowpea Diets. https://doi.org/10.21203/rs.3.rs-692378/v1

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Mfanuzile Welcome Lubisi F. Fushai R. Thomas J.J. Baloyi

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