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Accueil du site → Doctorat → Afrique du Sud → 2007 → The utilization by domestic ruminants in Botswana of treatment diets containing cereal crop stovers treated with urea or urea and molasses

University of the Free State (2007)

The utilization by domestic ruminants in Botswana of treatment diets containing cereal crop stovers treated with urea or urea and molasses

Letso, Moagi

Titre : The utilization by domestic ruminants in Botswana of treatment diets containing cereal crop stovers treated with urea or urea and molasses

Auteur : Letso, Moagi

Université de soutenance : University of the Free State

Grade : Philosophiae Doctor in Animal Nutrition 2007

Résumé partiel
The studies were aimed at examining the effects of treatment with urea or urea and molasses on the physical and chemical composition of stovers of sorghum, maize and millet and assessing the potential of these treated cereal crop stovers as additional feed for domestic ruminants in Botswana. The trials were carried out at Sebele, Botswana College of Agriculture (BCA), Botswana. Sebele is situated at 24º 33’S and 25º 57’E and is at an altitude of 994 m above sea level. Cereal crop stovers were ground in a hammer mill and treated with 10 g urea/kg stover (T1), 25 g urea/kg stover (T2) or 10 g urea + 10 g molasses/kg stover (T3) for 3 weeks. The experimental design for the treatment of the cereal crop stovers was a 3 x 4 completely randomized factorial design [3 cereal crop stovers and 3 treatment methods (T1, T2, T3) plus untreated]. Samples of cereal crop stovers untreated or treated with T1, T2 or T3 were obtained and analysed for dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fibre (NDF), acid detergent fibre (ADF), acid detergent lignin (ADL) and in vitro DM digestibility (IVDMD). The physical changes on the cereal crop stovers due to treatments were noted. Six steers, four of which were fitted with rumen cannulae, and six goats and six sheep were used in a crossover experiment to evaluate the utilisation of treatment diets containing stovers of sorghum, maize and millet treated with T1, T2 or T3. The animals were kept in individual pens and fed a basal diet of veld grass hay plus a commercially available feed, namely Pen-feed. Each animal had unrestricted access to water and a mineral lick and were adapted to the respective treatment diets for 14 days, followed by 7-day sampling periods The data collected included the feed intake and digestibility coefficients of DM, OM, CP, NDF and ADF. Data were also obtained on metabolisable energy (ME) intake, average daily gains and the pH and ammonia concentration of rumen fluid. Treatment with T1, T2 and T3 increased the CP, NDF, ADF, ADL and IVDMD of the cereal crop stovers.

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