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Animal Science Abstract

Influence of level of maize cob meal on nutrient digestibility and nitrogen balance in Large White, Mukota and LW× M F1 crossbred pigs

A. T. Kanengoni¹, K. Dzama^1,A, M. Chimonyo¹, J. Kusina² and S. M. Maswaure³

^ACorresponding author; e-mail dzama@vet.uz.ac.zw

¹University of Zimbabwe, Faculty of Veterinary of Science, Department of Paraclinical Veterinary Studies, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe
²University of Zimbabwe, Department of Animal Science, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe
³Specialised Animal Feed Company, PO Box ST324 Southerton, Harare, Zimbabwe

Abstract

A study was conducted to compare the digestibility of organic matter (OM), neutral-detergent fibre (NDF), acid-detergent fibre (ADF), hemicellulose and nitrogen (N) and N balance in Mukota (M), Large White (LW) and the LW _× M F₁ pigs. Four male pigs of each breed, at proportionately 0•3 of their mature body weights, were randomly allocated to each of four diets in a cross-over design. The diets, which were formulated to contain similar levels of protein (ca. 160 g crude protein per kg) and energy (ca. 9 MJ metabolizable energy per kg), contained 0, 100, 200 and 300 g maize cob meal per kg, which corresponded to NDF levels of 276•4, 360•3, 402•9 and 523•5 g/kg dry matter, respectively. There was a negative correlation (P < 0•001) between the digestibility of OM, NDF, ADF and hemicellulose and the level of NDF in the diet. The digestibility of OM, NDF, ADF and hemicellulose decreased linearly (P < 0•05) with increase in the level of NDF among all three genotypes. There was a genotype 5 diet interaction on NDF and ADF digestibilities with digestibility in the LW decreasing faster (P < 0•05) than in the Mukota and LW _× M F₁ cross with increasing NDF. Both breed and level of maize cob meal affected N digestibility (P < 0•001), whilst the N retained per unit metabolic body weight was only affected by diet (P < 0•01). Increasing the level of maize cob meal beyond 100 g/kg, however, did not reduce N digestibility (P < 0•05). There was neither genotype nor dietary effect (P > 0•05) on N retained per unit N intake. These findings showed that the Mukota and the LW _× M F₁ cross were better able to digest the fibrous components than the LW. In addition, the Mukota and the LW _× M F₁ cross displayed an ability to retain protein to the same extent as the LW.

Keywords: digestibility, maize cobs, nitrogen balance, pigs

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