Processed false yam seed meals in broiler chicken diets: effects on feed preference and apparent nutrient digestibility

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Processed false yam seed meals in broiler chicken diets: effects on feed preference and apparent nutrient digestibility A. Mohammed 1 & H. K. Dei 1 & A. Wesseh 1 & R. Roessler 2 & E. Schlecht 2 Received: 28 December 2019 / Accepted: 11 September 2020 # Springer Nature B.V. 2020

Abstract This study evaluated feed preference and apparent nutrient digestibility of a maize-based diet and modified diets containing treated false yam seed meals (TFYSM). False yam seeds were sun-dried (Un_T), or first soaked in water and treated with one of the following: urea (Urea_T), sodium chloride (NaCl_T), sodium hydroxide (NaOH_T), or potassium hydroxide (KOH_T) and blanched. The TFYSM replaced maize (wt/wt) in experimental diets at 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50%, respectively in a feed preference test (experiment 1). In that study, feed preference test was conducted with 6 × 4 broiler chicks aged 21 days in a randomized complete design; each level of each TFYSM was fed for 24 h and feed intake recorded. In experiment 2 of the study, apparent nutrient digestibility of TFYSM-based diets was evaluated for 15 days with 4-week-old chicks allocated to 5 groups of 20 birds which were further subdivided into 5 treatment groups of 4 birds (replicates) using the inclusion levels of 10, 20, 30, 40, and 50% respectively. The preference test data indicated that feed intake was not compromised when maize was substituted by NaCl_T, NaOH_T, Urea_T, and KOH_T FYSM at all levels, and Un_T FYSM up to 5% inclusion. Dry matter digestibility was generally high (> 75%) in all diets except for Un_T. Control diet and NaOH_T diets had similar CP digestibility, but higher than KOH_T diets, while Un_T diets had reduced CP digestibility. Digestibility of NFE ranged from (77.4%) (Un_T) to (93.8%) (KOH_T). Improving apparent nutrient digestibility of FYSM by sequential use of water-based and chemical treatment methods especially NaOH_T or KOH_T offers the potential to use this alternative feedstuff in broiler diets. Keywords Anti-nutrients . Processing . Icacina oliviformis . Nutrients . Poultry

Introduction False yam (Icacina oliviformis) is a perennial shrub that produces a large tuber (20 mt/ha) and a relatively low seed yield (0.214 mt/ha) (International Institute of Tropical Agriculture (IITA 2009) with high starch content (Fay 1991). It is commonly found in the Northern Region of Ghana, where it is of no food value. It provides three edible products that are appreciated for human consumption, namely fruits, seeds, and large starch-rich tubers (NRC 1988). Comparatively, the seed protein is higher (140 g CP/kg DM) than that of the tuber (44 g * A. Mohammed [email protected] 1

Department of Animal Science, University for Development Studies, P.O. Box TL 1882, Tamale, Ghana

2

University of Kassel and Georg-August-Universität Göttingen, Animal Husbandry in the Tropics and Subtropics, Steinstr. 19, 37213 Witzenhausen, Germany

CP/kg DM) (Fay 1991). However, the seed contains high starch (456.1 g/kg) (Dei et al. 2014) which i