Serum and liver retinol concentrations and blood β-carotene concentrations were studied in 30 Bos indicus heifers rendered deficient of vitamin A over 180 days and then given treatments of access to algae-based lick blocks (n = 10), injectable retinyl palmitate and molasses-based lick blocks (n =...
Parker, A.J.
,
Goopy, John P.
,
Callaghan, M.J.
,
Vermunt, J.J.
,
Nys, R. de
,
[Vitamin A deficiency in Bos indicus heifers fed a wheat straw diet cannot be corrected with algae lick blocks or intramuscular injectable retinyl palmitate treatments]
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Vitamin A deficiency in Bos indicus heifers fed a wheat straw diet cannot be corrected with algae lick blocks or intramuscular injectable retinyl palmitate treatments
Pelster, David E.
,
Goopy, John P.
,
Merbold, Lutz
,
Butterbach-Bahl, Klaus
,
[Importance of developing regional greenhouse gas emission factors]
,
Importance of developing regional greenhouse gas emission factors
Merbold, Lutz
,
Butterbach-Bahl, Klaus
,
Ericksen, Polly J.
,
Goopy, John P.
,
Korir, Daniel
,
Leitner, Sonja
,
Mutuo, Paul
,
Ndung’u, Phyllis W.
,
Onyango, Alice A.
,
Owino, Jesse
,
Pelster, David E.
,
Wanyama, George N.
,
[Improved greenhouse gas emission factors for smallholder livestock systems in East Africa]
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Improved greenhouse gas emission factors for smallholder livestock systems in East Africa
Availability of suitable feed, and in particular sources of protein-rich food, is a major constraint to increasing the productivity of smallholders in sub-Saharan Africa it is difficult to justify diverting land from growing crops for human consumption. The roots of the sweet potato are a high en...
Goopy, John P.
,
Gakige, J.
,
Korir, D.
,
Kvacic, M.
,
Butterbach-Bahl, Klaus
,
[Vines of the sweet potato (Ipomea batatas): A valuable feed supplement for ruminants in small holder systems]
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Vines of the sweet potato (Ipomea batatas): A valuable feed supplement for ruminants in small holder systems
In vivo determination of digestible organic matter (dOM) and metabolisable energy (ME) concentrations of feeds is laborious and expensive, whereas analysis of their nutrient contents is routinely performed. Prediction equations based on the chemical composition of feeds can be a compromise. This ...
Onyango, A.
,
Dickhoefer, Uta
,
Butterbach-Bahl, Klaus
,
Goopy, John P.
,
[Digestibility and metabolizable energy of selected tropical feedstuffs estimated by in vitro and prediction equations]
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Digestibility and metabolizable energy of selected tropical feedstuffs estimated by in vitro and prediction equations
Improving productivity in Kenyan smallholder dairy systems is perceived as having the potential to greatly improve the supply of milk to processors and make substantial improvements in rural incomes by doing so. Surveys recently commissioned by GIZ in Western Kenya indicated that milk yield was b...
Goopy, John P.
,
Gakige, J.K.
,
[Improving productivity in Kenyan smallholder dairy systems through selective, intensive education and supported adoption]
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Improving productivity in Kenyan smallholder dairy systems through selective, intensive education and supported adoption
Ndung’u, Phyllis
,
Butterbach-Bahl, Klaus
,
Merbold, Lutz
,
Goopy, John P.
,
Bebe, B.O.
,
Ondiek, J.O
,
[Improved region-specific emission factors for enteric methane emissions from cattle in smallholder mixed crop: livestock systems of Nandi County, Kenya]
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Improved region-specific emission factors for enteric methane emissions from cattle in smallholder mixed crop: livestock systems of Nandi County, Kenya
Measurement of liveweight of stock is one of the most important production tools available to farmers – playing a role in nutrition, fertility management, health and marketing. Yet most farmers in sub-Saharan Africa do not have access to scales on which to weigh cattle. Heart girth measurements (...
Goopy, John P.
,
Pelster, David E.
,
Onyango, A.
,
Marshall, Karen
,
Lukuyu, Margaret N.
,
[Simple and robust algorithms to estimate liveweight in African smallholder cattle]
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Simple and robust algorithms to estimate liveweight in African smallholder cattle
Goopy, John P.
,
Onyango, A.A.
,
Dickhoefer, Uta
,
Butterbach-Bahl, Klaus
,
[A new approach for improving emission factors for enteric methane emissions of cattle in smallholder systems of East Africa – Results for Nyando, Western Kenya]
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A new approach for improving emission factors for enteric methane emissions of cattle in smallholder systems of East Africa – Results for Nyando, Western Kenya