Christer Sundqvist | Southern Illinois University (original) (raw)

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Papers by Christer Sundqvist

Agricultural and Food Science

A sperm test was performed over a period of five consecutive years as a fertility check on a mink... more A sperm test was performed over a period of five consecutive years as a fertility check on a mink farm. As a result of the test sterile males were eliminated from breeding, which led to a distinct increase in the number of kits per female. Results of a histological and stereological analysis of testicular tissue from sterile, sub-fertile and fertile males showed clear agreement with the results of the sperm test. In testes taken from sterile males serious disorders were observed in the seminiferous epithelium. The value of the sperm test method as a fertility test is emphasized.

Journal of Experimental Zoology, 1991

Theriogenology, 1985

The mink, a seasonal breeder of great economic importance, shows a high incidence of male inferti... more The mink, a seasonal breeder of great economic importance, shows a high incidence of male infertility. This problem has forced investigators to find methods of assaying male mink infertility. In this study, morphometric studies have been performed on testicular tissue of a total of 31 males eliminated from breeding after testicular palpation, sperm test, and estimation of serum testosterone concentrations. Males having low sperm quality or disturbed testicular development (n=24) had significantly (p<O.Ol) lower numbers of spermatocytes, spermatids, and freefloating luminal spermatozoa compared with males with good sperm quality (n=7). No differences were found in the numbers of spermatogonia, Sertoli, and Leydig cells. Other morphometric parameters such as mean diameter, mean area, mean volume, percentage of area, and surface area per volume of nuclei are also presented for each cell type in the testis. It may be concluded that the sperm test is best suited for assessing fertility in mink. Severe disturbances in testicular development can be detected by testicular palpation and serum testosterone measurements.

Endocrine Reviews, 1988

Introduction THE MINK (Mustela vison) is a seasonally breeding, semiaquatic animal that is a dela... more Introduction THE MINK (Mustela vison) is a seasonally breeding, semiaquatic animal that is a delayed implanter belonging to the mammalian order Carnivora. It is not a traditional laboratory animal; nevertheless it is of great importance because it is a valuable fur-bearing animal bred and raised in captivity in significant numbers [25.9 million pelts produced 1982/1983 in the world (1)]. The animal has a short life cycle in that the period of time from breeding (early March) to pelting (late November and early December) is roughly 9 months. Few reviews exist on reproduction and endocrinology of the mink (2–5), although some books and book chapters have been written about their breeding (6–22). This review will, therefore, focus on the current knowledge on the reproductive endocrinology of mink. Endocrinology of Mink Reproduction The hypothalamic-pituitary unit Anatomy. As in other animals, the mink hypothalamus and pituitary gland form a close anatomical and functional unit (23–26) in which the hypothalam...

Computers in Biology and Medicine, 1989

Spreadsheet programs have become very popular as convenient ways of performing mathematical opera... more Spreadsheet programs have become very popular as convenient ways of performing mathematical operations, as well as entering and organizing data. This paper describes how Lotus 1-2-3 can be used to calculate the results of a radioimmunoassay, a widely used technique in biomedical laboratories.

Computers in Biology and Medicine, 1987

This paper describes a convenient way of performing statistical tests in biology. The recent deve... more This paper describes a convenient way of performing statistical tests in biology. The recent development of powerful spreadsheet programs for microcomputers has made it possible to easily apply various statistical significance tests on biological data. Presently the following tests have been implemented in the LOTUS 1-2-3 framework: Student's t-test, chi-square test, analysis of variance (single classification random ANOVA), Student-Neumann-Kuels test, correlation analysis and analysis of linear regression (single and multilevel design). The most important advantages gained by using 1-2-3 instead of the commercial statistical software packages are the simplicity of entering data, the possibility of asking "what-if?" questions, the simple, but useful graphical presentation of data and the ease of actual building of the tests.