Seminal transferrin and spermatogenic capability in the bull

• Published in: Biology of reproduction Vol. 43; no. 1; pp. 151 - 157
• Main Authors: Gilmont, R.R. (Washington State University Pullman, WA), Senger, P.L, Sylvester, S.R, Griswold, M.D
• Format: Journal Article
• Language: English
• Published: Madison, WI Society for the Study of Reproduction 01.07.1990
• Subjects: Animals; Biological and medical sciences; BULLS; Cattle - physiology; ESPERMATOZOO; Fundamental and applied biological sciences. Psychology; GLOBULINAS; GLOBULINE; GLOBULINS; Hormone metabolism and regulation; Male; Mammalian male genital system; MEASUREMENT; MEDICION; MESURE; Radioimmunoassay; Regression Analysis; Semen - analysis; SEMINAL PLASMA TRANSFERRIN; Sperm Count; Spermatogenesis - physiology; SPERMATOZOA; SPERMATOZOIDE; TAUREAU; TORO; Transferrin - analysis; Transferrin - physiology; Vertebrates: reproduction; VOLUME; VOLUMEN; Ferroprotein; Spermatozoa; Transferrin; Semen; Interaction; Ox; Male genital system; Vertebrata; Mammalia; Ejaculatio; Artiodactyla; Seminal plasma; Ungulata
• ISSN: 0006-3363; 1529-7268
• DOI: 10.1095/biolreprod43.1.151

The objective of this study was to determine the relationship between seminal transferrin and sperm output in ejaculates from mature dairy bulls. Caudal sperm reserves in mature Holstein bulls (n = 15) were depleted by 8 successive ejaculations during a 50-70-min period (depletion phase). Bulls were then ejaculated 6 times per week for a period of 4 weeks (6X phase). Weekly sperm output (WSO) and weekly transferrin output (WTfO) were the sums of sperm and transferrin levels in 6 ejaculates taken in 1 week of the study. Mean WSO ranged from 20.7 billion to 39.6 billion and mean WTfO ranged from 334 micrograms to 1872 micrograms among the bulls. Regression analysis of sperm and transferrin levels in ejaculates collected during the depletion phase indicated that approximately 40% of seminal transferrin was not related to sperm output and probably was from accessory fluids. A relationship between total seminal transferrin and total sperm in ejaculate was observed (p less than 0.01, r = 0.54). This relationship was stronger when the transferrin was corrected for accessory fluid contribution (p less than 0.01, r = 0.65). The relationship between WSO and WTfO corrected for accessory fluid transferrin contribution (cWTfO) was significant (p less than 0.01, r = 0.64). The relationship between WSO and cWTfO can be interpreted to reflect the relationship between actual testicular sperm production and transferrin from testicular or epididymal origin.