J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1987. 64:1110-1116.
© 1987 American Society of Animal Science
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Lee, K. H.
Right arrow Articles by Allrich, R. D.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Lee, K. H.
Right arrow Articles by Allrich, R. D.

Hormonal Patterns of Boars Exposed to Natural or Supplemental Lighting During Pubertal Development1,2,

K. H. Lee3, M. A. Diekman4, K. E. Brandt, D. M. Grieger and R. D. Allrich

Purdue University5, West Lafayette, IN 47907

Abstract

Thirty-two crossbred boars (Hampshire x Duroc x Yorkshire) were reared under natural lighting (35 lx) or supplemental lighting (1,400 lx) beginning at 4 wk of age. Boars received supplemental lighting from six 40-W fluorescent bulbs between 0530 and 2030 in a nursery unit. From 9 to 32 wk of age, boars received either natural lighting (30 lx) or supplemental lighting (100 lx) in a growing-finishing unit. Blood samples were collected from indwelling cannulae at 20-mm intervals for 6 h every 2 wk from 2.5 to 7 mo of age. Libido scores were evaluated during alternate weeks when intensive blood samples were not taken. Libido scores were not different between natural and supplemental lighting treatments (P>.30). However, at 122 d of age, libido scores of boars exposed to supplemental lighting tended to be higher (P=.10) than those exposed to natural lighting. Although mean serum concentrations of luteinizing hormone (LH) were higher (P<.05) in boars at 75, 89, 103 and 131 d of age reared under supplemental lighting than boars of the same age reared under natural lighting, the number of LH secretory spikes was similar between the treatment groups (P=.39). Serum concentrations of LH decreased in both treatment groups as boars became older (P<.05). However, the incidence of LH spikes was similar across ages and between treatment groups from 2.5 to 7 mo of age. Mean serum concentrations of follicle stimulating hormone and testosterone were similar between treatments (P>.75).

Footnotes

1 Journal paper no. 10,570, Purdue Univ. Agr. Exp. Sta.

2 Presented in part at the 77th Annu. Meet, of the Amer. Soc. of Anim. Sci., Athens, GA, abstr. no. 452. We gratefully acknowledge Dr. G. D. Niswender, Colorado State Univ., for supplying antisera to pLH and testosterone; Dr. L. E. Reichert, Jr., Albany Medical College, for supplying purified pLH; and Dr. R. J. Ryan, Mayo Clinic, for supplying purified pFSH. The technical assistance of R. Lummer and D. Blair is greatly appreciated.

3 Present address: Pig Research Institute, Taiwan, P. 0. Box 23, Chunan 35099, Taiwan, Republic of China.

4 Address reprint requests to this author.

5 Dept. of Anim. Sci.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1987 by the American Society of Animal Science.