Browsing by Author "Kariuki, JN."

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Dairy cattle farming in Kenya. A practical training manual for extension workers
(2016) Siamba, Donald N.; Lanyasunya, TP.; Kariuki, JN.
This easy-to-use guide to effective targeting of selected dairy interventions in Kenya is intended for use by anyone involved in dairy farming in the country, such as development planners, researchers, service providers, suppliers of dairy inputs and extension workers. The guide answers the question often faced by these workers: where is their proposed intervention most likely to be adopted? Using a combination of Geographical Information Systems (GIS) mapping methods and economic regression techniques, this guide shows where and under what circumstances dairy technologies are most likely to succeed. The guide is divided into three sections. The first section deals with concepts, rationale and methodologies for targeting dairy interventions. It also explains, with examples, how to use the guide. The second section presents the targeting maps for various dairy interventions. A total of eleven dairy interventions are considered in this guide. For each, a map shows relative probability of adoption together with a description of the innovation and background information. Also presented are the socio-economic, biophysical and agro-climatic characteristics that predispose uptake of each intervention. The third section presents some policy-relevant research results in three topical areas: Cost of milk production; Evaluation and assessment of alternative milk preservation techniques; and Employment generation in the dairy marketing chain.
The effects of feeding Calliandra Calothyrus at different patterns as a supplement to Rhodes grass hay on intake, nitrogen utilization and milk yield of dual purpose goats.
(KARI, 2004) Muia, JMK.; Romney, DL.; Siamba, Donald N.; Nguru, JN.; Kariuki, JN.
Calliandra calothyrsus is a tree legume native to Mexico and Central America. The species has attracted considerable attention for its capacity to produce both fuelwood and foliage for either green manure or fodder. Its high content of proanthocyanidins (condensed tannins) and associated low digestibility has, however, limited its use as a feed for ruminants, and there is also a widespread perception that wilting the leaves further reduces their nutritive value. Nevertheless, there has been increasing uptake of calliandra as fodder in certain regions, notably the Central Highlands of Kenya. The present study, conducted in Embu, Kenya, investigated effects of provenance, wilting, cutting frequency and seasonal variation both in the laboratory (in vitro digestibility, crude protein, neutral detergent fibre, extractable and bound proanthocyanidins) and in on-station animal production trials with growing lambs and lactating goats. The local Kenyan landrace of calliandra (Embu) and a closely-related Guatemalan provenance (Patulul) were found to be significantly different, and superior, to a provenance from Nicaragua (San Ramón) in most of the laboratory traits measured, as well as in animal production and feed efficiency. Cutting frequency had no important effect on quality; and although all quality traits displayed seasonal variation there was little discernible pattern to this variation. Wilting had a much less negative effect than expected, and for lambs fed calliandra as a supplement to a low quality basal feed (maize stover), wilting was actually found to give higher live-weight gain and feed efficiency. Conversely, with a high quality basal diet (Napier grass) wilting enhanced intake but not live-weight gain, so feed efficiency was greater for fresh material. The difference between fresh and wilted leaves was not great enough to justify the current widespread recommendation that calliandra should always be fed fresh.