Zobrazeno 1 - 10
of 79
pro vyhledávání: '"D D Lunstra"'
Publikováno v:
Animal Reproduction Science. 119:228-234
Hemicastration of males increases weight of remaining testis when conducted before Sertoli cells cease to proliferate. The current studies re-examined responses to hemicastration in one-quarter Meishan crossbred boars that differed for two alleles of
Autor:
Anthony E. Archibong, Daryl B. Hood, Mohammad S. Niaz, Edward R. Hills, Frank Inyang, D D Lunstra, Prapaporn Kopsombut, Aramandla Ramesh, Kea M. Jones
Publikováno v:
Experimental and Toxicologic Pathology. 60:269-280
The objective of this study was to evaluate the reproductive risk associated with exposure of adult male Fisher-344 rats to inhaled benzo(a)pyrene (BaP). Rats were assigned randomly to a treatment or control group. Treatment consisted of sub-chronic
Autor:
Michael J. D'Occhio, M.L. Mussard, D. D. Lunstra, T. L. Davis, H. Jiménez-Severiano, W. J. Enright, J. E. Kinder
Publikováno v:
Animal Reproduction Science. 98:204-224
The objective was to compare the relative response between rams and bulls in characteristics of LH, FSH and testosterone (T) secretion, during and after long-term treatment with GnRH analogs. Animals were treated with GnRH agonist, GnRH antagonist, o
Publikováno v:
Theriogenology. 64:657-678
Crossbred (Bos taurus) yearling beef bulls were assessed for breeding soundness and physical traits prior to multi-sire natural mating at pasture. Bulls (n = 60) were assigned to six groups of nine or 10 bulls and two bull-groups were rotated on 14-d
Publikováno v:
Biology of Reproduction. 72:214-220
The field of genomics applies the dissection of genetic differences toward an understanding of the biology of complex traits. Quantitative trait loci (QTL) for testis size, plasma FSH in boars, and body composition (backfat) have been identified near
Publikováno v:
Journal of Animal Science. 82:459-471
Comparisons of numbers of antral ovarian follicles and corpora lutea (CL), of blood hormone concentrations, and of follicular fluid steroid concentrations and IGFBP activity were conducted between cows selected (twinner) and unselected (control) for
Publikováno v:
Journal of Endocrinology. 178:395-403
Chinese Meishan (MS) boars have smaller testes due to fewer Sertoli cells compared with White Composite (WC) boars. The objective was to describe Sertoli cell development relative to circulating FSH concentrations in fetal and neonatal MS and WC boar
Publikováno v:
Journal of Animal Science. 81:503-511
The inverse relationship of testicular size and circulating follicle-stimulating hormone (FSH) concentrations has been documented, and accompanying this relationship is the change in color of the parenchymal tissue of the testes. Large testes (300 to
Publikováno v:
Biology of Reproduction. 68:140-150
Changes in Sertoli cell numbers and testicular structure during normal development and compensatory hypertrophy were assessed in crossbred Meishan 3 White Composite males. Boars were assigned at birth to unilateral castration at 1, 10, 56, or 112 day
Publikováno v:
Biology of Reproduction. 64:689-695
The positive relationship between Sertoli cell number and testicular size emphasizes the importance of determining factors involved in the regulation of the Sertoli cell population. Based on data from other species and indirect evidence in the boar,