N.N. Umunna

1.2k total citations
74 papers, 978 citations indexed

About

N.N. Umunna is a scholar working on Agronomy and Crop Science, Genetics and Animal Science and Zoology. According to data from OpenAlex, N.N. Umunna has authored 74 papers receiving a total of 978 indexed citations (citations by other indexed papers that have themselves been cited), including 57 papers in Agronomy and Crop Science, 28 papers in Genetics and 17 papers in Animal Science and Zoology. Recurrent topics in N.N. Umunna's work include Ruminant Nutrition and Digestive Physiology (51 papers), Genetic and phenotypic traits in livestock (28 papers) and Reproductive Physiology in Livestock (12 papers). N.N. Umunna is often cited by papers focused on Ruminant Nutrition and Digestive Physiology (51 papers), Genetic and phenotypic traits in livestock (28 papers) and Reproductive Physiology in Livestock (12 papers). N.N. Umunna collaborates with scholars based in Nigeria, Netherlands and United States. N.N. Umunna's co-authors include I.V. Nsahlai, P.O. Osuji, R.J. Kaitho, S. Tamminga, J. van Bruchem, M.L.K. Bonsi, Azage Tegegne, A. K. Tuah, Yoseph Mekasha and Hannele Khalili and has published in prestigious journals such as Journal of Animal Science, Journal of the Science of Food and Agriculture and Animal Feed Science and Technology.

In The Last Decade

N.N. Umunna

65 papers receiving 773 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
N.N. Umunna Nigeria	20	779	301	231	224	218	74	978
L.R. Ndlovu Zimbabwe	18	532 0.7×	206 0.7×	174 0.8×	169 0.8×	169 0.8×	56	760
A.A. Aganga Nigeria	17	316 0.4×	243 0.8×	99 0.4×	145 0.6×	159 0.7×	57	708
José Neuman Miranda Neiva Brazil	17	759 1.0×	431 1.4×	301 1.3×	203 0.9×	249 1.1×	160	1.2k
Cláudia Batista Sampaio Brazil	16	933 1.2×	251 0.8×	322 1.4×	352 1.6×	158 0.7×	44	1.1k
T. T. Treacher China	17	830 1.1×	210 0.7×	215 0.9×	492 2.2×	65 0.3×	54	1.0k
Camila Celeste Brandão Ferreira Ítavo Brazil	16	785 1.0×	375 1.2×	197 0.9×	287 1.3×	211 1.0×	169	1.1k
A. J. Ayala‐Burgos Mexico	16	427 0.5×	220 0.7×	169 0.7×	128 0.6×	127 0.6×	56	690
J. D. Popp Canada	13	609 0.8×	146 0.5×	138 0.6×	137 0.6×	185 0.8×	19	833
Mário De Beni Arrigoni Brazil	16	624 0.8×	534 1.8×	90 0.4×	385 1.7×	105 0.5×	99	1.1k
José Maurício de Souza Campos Brazil	18	847 1.1×	372 1.2×	190 0.8×	330 1.5×	196 0.9×	71	1.0k

Countries citing papers authored by N.N. Umunna

Since Specialization

Citations

This map shows the geographic impact of N.N. Umunna's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by N.N. Umunna with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites N.N. Umunna more than expected).

Fields of papers citing papers by N.N. Umunna

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by N.N. Umunna. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by N.N. Umunna. The network helps show where N.N. Umunna may publish in the future.

Co-authorship network of co-authors of N.N. Umunna

This figure shows the co-authorship network connecting the top 25 collaborators of N.N. Umunna. A scholar is included among the top collaborators of N.N. Umunna based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with N.N. Umunna. N.N. Umunna is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Woldemeskel, Moges, Azage Tegegne, N.N. Umunna, R.J. Kaitho, & S. Tamminga. (2001). Effects of Leucaena pallida and Sesbania sesban supplementation on testicular histology of tropical sheep and goats. Animal Reproduction Science. 67(3-4). 253–265. 11 indexed citations

Mekasha, Yoseph, et al.. (2000). Feed resources and nutritional management of dairy herds in urban and peri-urban dairy production systems in Ethiopia. CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research). 4 indexed citations

Kaitho, R.J., N.N. Umunna, I.V. Nsahlai, S. Tamminga, & J. van Bruchem. (1998). Utilization of browse supplements with varying tannin levels by Ethiopian Menz sheep 2. Nitrogen metabolism.. Agricultural Systems. 39. 161–173. 1 indexed citations

Crosse, S., et al.. (1998). Comparative yield and nutritive value of forages from two cereal-legume based cropping systems. 2. Milk production and reproductive performance of crossbred dairy cows. Tropical Agriculture. 75(4). 415–421. 2 indexed citations

Umunna, N.N., et al.. (1998). The effects of trypanosomiasis and other factors on rectal temperature and blood picture of Muturu cattle (Bos brachyceros) reared under traditional village management system. CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research). 1 indexed citations

Kaitho, R.J., N.N. Umunna, I.V. Nsahlai, S. Tamminga, & J. van Bruchem. (1998). Utilization of browse supplements with varying tannin levels by Ethiopian Menz sheep 1. Intake, digestibility and live weight changes.. Agricultural Systems. 39. 145–159. 13 indexed citations

Kaitho, R.J., I.V. Nsahlai, Barbara A. Williams, et al.. (1998). Relationships between preference, rumen degradability, gas production and chemical composition of browses.. Agricultural Systems. 39. 129–144. 18 indexed citations

Nsahlai, I.V., M. J. Bryant, & N.N. Umunna. (1998). Utilisation of Barley Straw by Steers: The Effect of Quantity and Source of Nitrogen on the Degradation of Straw Fractions, Particle Outflow Rate and Intake. Journal of Applied Animal Research. 14(1). 33–50. 8 indexed citations

Kaitho, R.J., N.N. Umunna, I.V. Nsahlai, S. Tamminga, & J. van Bruchem. (1998). Digestibility of rumen undegradable protein from 40 browse species measured by mobile nylon bag and in vitro techniques. BSAP Occasional Publication. 22. 123–126. 2 indexed citations

10.

Nsahlai, I.V., N.N. Umunna, & M.L.K. Bonsi. (1998). The utilization of teff (Eragrotis tef) straw by sheep fed supplementary forage legumes with or without either crushed maize grain or wheat bran. Small Ruminant Research. 29(3). 303–315. 19 indexed citations

11.

Mukasa-Mugerwa, E., D.O. Anindo, A. Lahlou-Kassi, N.N. Umunna, & Azage Tegegne. (1997). Effect of body condition and energy utilization on the length of post-partum anoestrus in PRID-treated and untreated post-partumBos indicus(Zebu) cattle. Animal Science. 65(1). 17–24. 4 indexed citations

12.

Nsahlai, I.V. & N.N. Umunna. (1996). Comparison between reconstituted sheep faeces and rumen fluid inocula and between in vitro and in sacco digestibility methods as predictors of intake and in vivo digestibility. The Journal of Agricultural Science. 126(2). 235–248. 38 indexed citations

13.

Osuji, P.O., Hannele Khalili, & N.N. Umunna. (1995). The effects of cottonseed cake with or without molasses on feed utilization, purine excretion, and milk production of Boran (Bos indicus) cows fed a mixture of wheat and oat straw. CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research). 6 indexed citations

14.

Osuji, P.O., et al.. (1995). Effect of level of milk feeding and type of housing on the performance of crossbred calves (Bos Taurus × Bos indicius) and zebu calves (Bos indicus). Tropical Agriculture. 72(3). 241–248. 1 indexed citations

15.

Umunna, N.N. & Paul Iji. (1993). The natural feed resources for ruminant animals in Nigeria. CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research). 1 indexed citations

16.

Aganga, A.A., et al.. (1990). Response to water deprivation by Yankasa ewes under different physiological states. Small Ruminant Research. 3(2). 109–115. 16 indexed citations

17.

Aganga, A.A., et al.. (1989). Breed differences in water metabolism and body composition of sheep and goats. The Journal of Agricultural Science. 113(2). 255–258. 14 indexed citations

18.

Lakpini, C. A. M., et al.. (1982). Compensatory growth in yankasa lambs 1. feed intake liveweight gain and efficiency of feed conversion. 2(2). 69–80. 2 indexed citations

19.

Umunna, N.N., et al.. (1980). Calcium and phosphorus requirements of growing Yankasa lambs in the savanna region of Nigeria. Estimation of the calcium and phosphorus requirement by the factorial method.. East African Agricultural and Forestry Journal. 45(4). 269–276. 4 indexed citations

20.

Umunna, N.N., et al.. (1980). Reproductive performance of the Y'ankasa sheep of Nigeria. Theriogenology. 14(4). 239–248. 8 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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