Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Effects of Leucaena pallida and Sesbania sesban supplementation on testicular histology of tropical sheep and goats
Woldemeskel, M. ; Tegegne, A. ; Umunna, N.N. ; Kaitho, R.J. ; Tamminga, S. - \ 2001
Animal Reproduction Science 67 (2001). - ISSN 0378-4320 - p. 253 - 265.
Thirty Ethiopian highland rams with an average body weight of 23.7 kg (S.D.=1.23) and age of 18 months and 25 East African bucks with an average body weight of 18.6 kg (S.D.=2.06) and age of 14 months were used to study the long term effects of supplementation with the leaves of Leucaena pallida and Sesbania sesban on testicular histology. Within species, animals were blocked based on body weight and scrotal circumference and randomly assigned, within blocks, to five nutritional treatment groups in a complete randomised block design. All animals were provided with unchopped teff (Eragrostis tef) straw ad libitum and were supplemented with either 150 g of wheat bran (control), leucaena (200 or 400 g) or sesbania (200 or 400 g) leaves for a period of 6 months. At the end of the experimental period, all animals were surgically castrated and testicular samples were collected and prepared for histopathological examination. In sheep 200 g S. sesban induced relatively more necrosis of the seminiferous tubules than 200 g L. pallida, but with similar degree of tubular degeneration. However, lesions in testis of goats fed on 200 g S. sesban and 200 g L. pallida did not differ. The effect of 400 g S. sesban and 400 g L. pallida in sheep indicated that the former hardly induced lesions except depressive effect on spermatogenesis. Similar results were observed in goats. About 400 g S. sesban induced milder lesions in sheep and goats than were 200 g S. sesban. The lesions were compared and discussed in relation to the phytochemical composition of the supplementary feeds.
Dairy farming in Kenya : resources and nitrogen flows
Zemmelink, G. ; Romney, D.L. ; Kaitho, R.J. - \ 1999
In: Outcome and perspectives of collaborative Research. Proceedings 10th Symp. Tropical Animal Health and Production, Faculty ofVeterinary Medicine, Utrecht - p. 46 - 50.
Utilization of browse supplements with varying tannin levels by Ethiopian Menz sheep 2. Nitrogen metabolism.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van - \ 1998
Agricultural Systems 39 (1998). - ISSN 0308-521X - p. 161 - 173.
Utilization of browse supplements with varying tannin levels by Ethiopian Menz sheep 1. Intake, digestibility and live weight changes.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van - \ 1998
Agricultural Systems 39 (1998). - ISSN 0308-521X - p. 145 - 159.
Relationships between preference, rumen degradability, gas production and chemical composition of browses.
Kaitho, R.J. ; Nsahlai, I.V. ; Williams, B.A. ; Umunna, N.N. ; Tamminga, S. ; Bruchem, J. van - \ 1998
Agricultural Systems 39 (1998). - ISSN 0308-521X - p. 129 - 144.
Nitrogen in browse species: ruminal degradability and post-ruminal digestibility measured by mobile nylon bag and in vitro techniques.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van - \ 1998
Journal of the Science of Food and Agriculture 76 (1998). - ISSN 0022-5142 - p. 488 - 498.
Effect of Leucaena and Sesbania supplementation on body growth and scrotal circumference of Ethiopian highland sheep and goats fed teff straw basal diet.
Kaitho, R.J. ; Tegegne, A. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van; Arts, J.M. - \ 1998
Livestock Production Science 54 (1998). - ISSN 0301-6226 - p. 173 - 181.
Effect of feeding graded levels of Leucaena leucocephala, Leucaena pallida, Sesbania sesban and Chamaecytisus palmensis supplements to teff straw given to Ethiopian highland sheep.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van - \ 1998
Animal Feed Science and Technology 72 (1998). - ISSN 0377-8401 - p. 355 - 366.
Digestibility of rumen undegradable protein from 40 browse species measured by mobile nylon bag and in vitro techniques.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van - \ 1997
In: Abstracts Int. Symp. 'In vitro techniques for measuring nutrient supply in ruminants', University of Reading, July 8-10 - p. 20 - 20.
Nutritive value of browses as protein supplement(s) to poor quality roughages
Kaitho, R.J. - \ 1997
Agricultural University. Promotor(en): S. Tamminga; N.N. Umunna; J. van Bruchem. - S.l. : Kaitho - ISBN 9789054857358 - 189 p.
herkauwers - diervoeding - voedingswaarde - voedersupplementen - eiwitvertering - smakelijkheid - veevoeder - eiwitten - ruminants - animal nutrition - nutritive value - feed supplements - protein digestion - palatability - fodder - proteins
<p>In tropical and subtropical regions, pasture grasses and cereal residues are frequently low in nutrients especially protein and therefore cannot support high levels of ruminant production. Many browse species are endowed with high levels of protein and hence suitable as supplements. The objective of this study was to develop indices that could be used to predict nutritive value of browses as supplements to poor quality roughage basal diets. Experiments were carried out to address issues related to establishing an experimental protocol for screening large browse species in feeding trials, the effect of animal species and the proportion of browse in the diet. Different methods to estimate protein digestion in small intestine were compared and data of individual browses collected. The palatability method developed was suitable for evaluating palatability of large numbers of browses under stall feeding condition. If palatability is done to predict long term intake a period of 5 to 8 days should be allowed. Classification of browses using either chemical composition, degradability or gas production characteristics led to different cluster groups than when palatability was used. Tannins had beneficial attributes at moderate levels and detrimental effect at high levels. The optimum level of browse supplementation was 30 to 45% of the ration dry matter. Browses need to be further studied since some of the secondary chemicals contained may affect reproduction.
Palatability of wilted and dried multipurpose tree species fed to sheep and goats.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van; Hanson, J. - \ 1997
Animal Feed Science and Technology 65 (1997). - ISSN 0377-8401 - p. 151 - 163.
Effect of feeding graded levels of browse supplements to teff straw given to sheep.
Kaitho, R.J. ; Umunna, N.N. ; Nsahlai, I.V. ; Tamminga, S. ; Bruchem, J. van - \ 1997
In: Book of abstracts 48th Annual Meeting European Association for Animal Production, Vienna / van Arendonk, J.A.M., - p. 224 - 224.
Palatability of multipurpose tree species; effect of species and length of study on intake and relative palatability by sheep.
Kaitho, R.J. ; Umunna, N.N. ; Nsahli, I.V. ; Tamminga, S. ; Bruchem, J. van; Hanson, J. ; Wouw, M. van de - \ 1996
Agricultural Systems 33 (1996). - ISSN 0308-521X - p. 249 - 261.
Rumen degradation and in vivo digestibility of dried Calliandra calothyrsus leaves.
Kaitho, R.J. ; Tamminga, S. ; Bruchem, J. van - \ 1993
Animal Feed Science and Technology 43 (1993). - ISSN 0377-8401 - p. 19 - 30.
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