Seasonal levels of reproductive hormones and their relationship to the antler cycle of male and female reindeer (Rangifer tarandus)

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
G A BubenikL Bartos

Abstract

Seasonal levels of LH, FSH, testosterone (T), estradiol, progesterone (P), and prolactin (PRL) were determined in the plasma of five adult bulls, and five barren and four pregnant cows of Alaskan reindeer (Rangifer tarandus), which were sampled every 3 weeks for 54 weeks. The male reproductive axis was sequentially activated; LH peaked in May-June (2 ng/ml), FSH in June (51 ng/ml), and T in September (11.8 ng/ml). LH levels in females reached a maximum in both groups at the end of August (the beginning of the rut). Seasonal variation in FSH was minimal in pregnant cows, but exhibited one elevation (41 ng/ml) in barren ones in November. T levels in cows remained at barely detectable levels. The decrease of T values observed in both groups in December and March was not significant. PRL peaked in May in cows (135 ng/ml pregnant, 140 ng/ml non-pregnant) and in June in bulls (92 ng/ml). Estradiol was highest in bulls in the rut (August), in non-pregnant cows in January and in pregnant cows in April, shortly before parturition. P levels in the pregnant cows rose from September and peaked (9 ng/ml) shortly before parturition in April. In the non-pregnant females P values increased and decreased several times before peaking (5 ng/ml) i...Continue Reading

References

Jul 1, 1977·Journal of Reproduction and Fertility·A Sempéré
Nov 1, 1989·Calcified Tissue International·S N Baksi, J W Newbrey
Jan 1, 1986·Comparative Biochemistry and Physiology. A, Comparative Physiology·G A Bubenik, D Schams
Jan 1, 1987·Comparative Biochemistry and Physiology. A, Comparative Physiology·G A BubenikA J Sempere
Jul 1, 1988·Journal of Reproduction and Fertility·A S Loudon, J D Curlewis
Jan 1, 1987·Journal of Pineal Research·C L AdamC E Moir
Nov 1, 1986·Journal of Reproduction and Fertility·G W AsherA J Peterson
Aug 1, 1974·Journal of Reproduction and Fertility·H Karg, D Schams
Jun 1, 1973·Canadian Journal of Zoology·P E Whitehead, E H McEwan
Jan 1, 1984·Comparative Biochemistry and Physiology. A, Comparative Physiology·M Ryg
May 1, 1984·Journal of Reproduction and Fertility·J M SuttieR N Kay
Jun 1, 1982·Canadian Journal of Physiology and Pharmacology·G A BubenikA Claus
Nov 1, 1980·Physiology & Behavior·A S FlemingC Luebke
Aug 1, 1994·Steroids·L K Lewis, G K Barrell
May 1, 1994·Journal of Reproduction and Fertility·G A Lincoln, N J Tyler
May 1, 1951·The American Journal of Anatomy·C M WALDO, G B WISLOCKI

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Citations

Oct 17, 1998·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·L BartosA Lobos
Mar 15, 2016·General and Comparative Endocrinology·Scott DaviesPierre Deviche
Jun 8, 2004·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·María Dolores ParraJosé Joaquín Cerón
Feb 24, 2005·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·George A BubenikGlen J van der Kraak
Apr 28, 2020·Biological Reviews of the Cambridge Philosophical Society·Alireza Nasoori
Dec 29, 2020·The Veterinary Clinics of North America. Food Animal Practice·N Isaac Bott
Feb 24, 2021·Animal Reproduction Science·Sz NagyØ Holand

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