J. Sumar

1.1k total citations
26 papers, 722 citations indexed

About

J. Sumar is a scholar working on Agronomy and Crop Science, Equine and Genetics. According to data from OpenAlex, J. Sumar has authored 26 papers receiving a total of 722 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Agronomy and Crop Science, 8 papers in Equine and 7 papers in Genetics. Recurrent topics in J. Sumar's work include Reproductive Physiology in Livestock (19 papers), Veterinary Equine Medical Research (8 papers) and Genetic and phenotypic traits in livestock (6 papers). J. Sumar is often cited by papers focused on Reproductive Physiology in Livestock (19 papers), Veterinary Equine Medical Research (8 papers) and Genetic and phenotypic traits in livestock (6 papers). J. Sumar collaborates with scholars based in Peru, United States and Sweden. J. Sumar's co-authors include Gregory P. Adams, O.J. Ginther, P. Walter Bravo, L.‐E. Edqvist, W. C. Foote, M. Forsberg, Peter W. Nathanielsz, S. Fernández-Baca, William Hansel and H. Kindahl and has published in prestigious journals such as SHILAP Revista de lepidopterología, Biology of Reproduction and Reproduction.

In The Last Decade

J. Sumar

24 papers receiving 628 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
J. Sumar Peru	16	583	258	216	209	163	26	722
S. Fernández-Baca United States	7	346 0.6×	163 0.6×	92 0.4×	108 0.5×	82 0.5×	10	416
L. Zarco Mexico	15	608 1.0×	386 1.5×	145 0.7×	78 0.4×	78 0.5×	55	776
John R. Newcombe United Kingdom	16	603 1.0×	151 0.6×	176 0.8×	468 2.2×	115 0.7×	58	704
G. S. Frazer United States	15	606 1.0×	257 1.0×	68 0.3×	206 1.0×	62 0.4×	51	796
Juan Cuervo‐Arango Spain	18	682 1.2×	191 0.7×	462 2.1×	416 2.0×	265 1.6×	91	873
Wayne G. Etherington Canada	6	370 0.6×	229 0.9×	78 0.4×	62 0.3×	78 0.5×	7	499
M. A. Memon United States	12	222 0.4×	125 0.5×	161 0.7×	52 0.2×	114 0.7×	34	430
Marta Siemieniuch Poland	18	465 0.8×	131 0.5×	178 0.8×	168 0.8×	162 1.0×	60	728
Squires El United States	17	560 1.0×	149 0.6×	359 1.7×	384 1.8×	327 2.0×	27	842
Donald W. Holtan United States	12	501 0.9×	148 0.6×	85 0.4×	287 1.4×	25 0.2×	19	611

Countries citing papers authored by J. Sumar

Since Specialization

Citations

This map shows the geographic impact of J. Sumar'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 J. Sumar with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J. Sumar more than expected).

Fields of papers citing papers by J. Sumar

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by J. Sumar. 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 J. Sumar. The network helps show where J. Sumar may publish in the future.

Co-authorship network of co-authors of J. Sumar

This figure shows the co-authorship network connecting the top 25 collaborators of J. Sumar. A scholar is included among the top collaborators of J. Sumar 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 J. Sumar. J. Sumar 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

Sumar, J., et al.. (2016). 0VULACIÓN ESPONTÁNEA O EFECTO MACHO EN ALPACAS Y LLAMAS. SHILAP Revista de lepidopterología. 1(6). 30–35.

Tibary, Ahmed, et al.. (2013). Chronology of early embryonic development and embryo uterine migration in alpacas. Theriogenology. 79(4). 702–708. 22 indexed citations

Huanca, T., et al.. (2012). Twin reciprocal embryo transfer between alpacas and llamas. 2 indexed citations

Sumar, J.. (2012). Embryo transfer in domestic South American camelids. Animal Reproduction Science. 136(3). 170–177. 22 indexed citations

Sumar, J.. (2007). Realidades y mitos sobre los camelidos sudamericanos. Bioline International (Bioline International).

Sumar, J., et al.. (1998). Plasma concentrations of 15-ketodihydro-PGF2α, progesterone, oestrone sulphate, oestradiol-17β and cortisol during late gestation, parturition and the early post partum period in llamas and alpacas. Animal Reproduction Science. 50(1-2). 111–121. 15 indexed citations

Sumar, J.. (1996). Reproduction in llamas and alpacas. Animal Reproduction Science. 42(1-4). 405–415. 33 indexed citations

Forsberg, M., et al.. (1995). Endocrine Changes after Mating in Pregnant and Non-Pregnant Llamas and Alpacas. Acta veterinaria Scandinavica. 36(4). 489–498. 61 indexed citations

Sumar, J.. (1994). Effects of various ovulation induction stimuli in alpacas and llamas. Journal of Arid Environments. 26(1). 39–45. 16 indexed citations

10.

Sumar, J., P. Walter Bravo, & W. C. Foote. (1993). Sexual receptivity and time of ovulation in alpacas. Small Ruminant Research. 11(2). 143–150. 28 indexed citations

11.

Sumar, J. & P. Walter Bravo. (1991). In situ observation of the ovaries of llamas and alpacas by use of a laparoscopic technique. Journal of the American Veterinary Medical Association. 199(9). 1159–1163. 10 indexed citations

12.

Adams, Gregory P., J. Sumar, & O.J. Ginther. (1991). Hemorrhagic ovarian follicles in llamas. Theriogenology. 35(3). 557–568. 20 indexed citations

13.

Bravo, P. Walter & J. Sumar. (1991). Evaluation of intra-abdominal vasectomy in llamas and alpacas. Journal of the American Veterinary Medical Association. 199(9). 1164–1166. 8 indexed citations

14.

Adams, Gregory P., J. Sumar, & O.J. Ginther. (1990). Effects of lactational and reproductive status on ovarian follicular waves in llamas ( Lama glama ). Reproduction. 90(2). 535–545. 118 indexed citations

15.

Alarcón, M. Victoria, et al.. (1990). Comparison of three methods of pregnancy diagnosis in alpacas and llamas. Theriogenology. 34(6). 1119–1127. 22 indexed citations

16.

Bravo, P. Walter & J. Sumar. (1989). Laparoscopic examination of the ovarian activity in alpacas. Animal Reproduction Science. 21(3-4). 271–281. 47 indexed citations

17.

Sumar, J.. (1988). Present and Potential Role of South American Camelids in the High Andes. Outlook on Agriculture. 17(1). 23–29. 12 indexed citations

18.

Fredriksson, G., et al.. (1988). Levels of 15-keto-1344-dihydro-PFG2α, Progesterone and Oestradiol-17β after Induced Ovulations in Llamas and Alpacas. Acta veterinaria Scandinavica. 29(3-4). 339–346. 32 indexed citations

19.

Steven, D. H., Graham J. Burton, J. Sumar, & Peter W. Nathanielsz. (1980). Ultrastructural observations on the placenta of the alpaca (Lama pacos). Placenta. 1(1). 21–32. 32 indexed citations

20.

Samuel, C. A., J. Sumar, & Peter W. Nathanielsz. (1979). Histological observations of the adrenal glands of newborn alpacas (Lama pacos). Comparative Biochemistry and Physiology Part A Physiology. 62(2). 387–396. 1 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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