Document Detail


Regulation of luteinizing hormone secretion in prepubertal heifers fed an energy-deficient diet.
MedLine Citation:
PMID:  2271725     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of feeding a diet restricted in energy on the endocrine mechanisms regulating LH secretion in prepubertal heifers were examined. On Day 0, thirty heifers were assigned to be either ovariectomized (OVX; n = 10), ovariectomized and administered an estradiol implant (OVXE; n = 10), or to remain ovary-intact (INT, n = 10). Five heifers each were then assigned to be fed either a control (C) or a two-phase, low-to-high energy (L), dietary treatment. The C diet was formulated to support weight gains of 1.1 kg/day throughout the experiment (Day 0-197). Heifers receiving the L treatment were provided a diet restricted in energy (33% of C diet) from Day 0-127 followed by a diet similar to that fed to heifers receiving the C treatment from Day 128-197. Secretion of LH increased rapidly following ovariectomy in C-OVX and L-OVX heifers. During the period of energy restriction, LH pulse frequency was reduced, and mean LH concentration, pulse amplitude, and pituitary response to LHRH were greater in L-OVX than in C-OVX heifers. In L-OVXE and L-INT heifers, secretion of LH was low and unchanged during the period of dietary energy restriction. In contemporaneous treatment groups fed the C diet (C-OVXE and C-INT), frequency of LH pulses increased gradually during this period and C-INT heifers attained puberty on Day 121 +/- 18. Upon switching heifers in the L-OVX, L-OVXE, and L-INT treatments to the C diet, all characteristics of LH secretion changed markedly within 14 days to levels similar to those detected in the C treatments.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
S G Kurz; R M Dyer; Y Hu; M D Wright; M L Day
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Biology of reproduction     Volume:  43     ISSN:  0006-3363     ISO Abbreviation:  Biol. Reprod.     Publication Date:  1990 Sep 
Date Detail:
Created Date:  1991-02-25     Completed Date:  1991-02-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  450-6     Citation Subset:  IM    
Affiliation:
Department of Animal Science, Ohio State University, Columbus 43210.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cattle / physiology*
Dietary Carbohydrates*
Estradiol / physiology
Female
Gonadotropin-Releasing Hormone / pharmacology
Luteinizing Hormone / secretion*
Nutritional Physiological Phenomena*
Ovariectomy
Periodicity
Pituitary Gland / secretion
Progesterone / blood
Sexual Maturation
Weight Gain
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 33515-09-2/Gonadotropin-Releasing Hormone; 50-28-2/Estradiol; 57-83-0/Progesterone; 9002-67-9/Luteinizing Hormone

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