PMID- 2620072
OWN - NLM
STAT- MEDLINE
DCOM- 19900321
LR  - 20190510
IS  - 0006-3363 (Print)
IS  - 0006-3363 (Linking)
VI  - 41
IP  - 4
DP  - 1989 Oct
TI  - Effects of preoptic and hypothalamic lesions in female turkeys during a 
      photoinduced reproductive cycle.
PG  - 610-7
AB  - Prolactin (Prl) is released by electrical stimulation in the turkey hypothalamus 
      and preoptic area (POA). Possible trajectories for POA efferents to the median 
      eminence (ME) were tested by placing lesions in the POA, the lateral hypothalamus 
      (LHy), or the ventromedial nucleus of the hypothalamus (VMN) of reproductively 
      quiescent turkey hens, then subjecting them to long photoperiods while monitoring 
      their blood Prl levels and nesting activities. In addition, lesions were made in 
      the VMN of a group of incubating hens to learn whether the lesions would cause 
      the elevated Prl levels to fall or interfere with incubation behavior. Lesions in 
      medial POA, LHy, or VMN prevented the onset of incubation and prevented the large 
      rise in Prl associated with it. However, these lesions did not interfere with the 
      initial, more gradual Prl rise caused by increasing daylengths. Lesions in LHy or 
      VMN appeared to interfere with a pathway lying laterally from POA to ME. 
      Electrical stimulation in medial POA, which caused an increase in circulating 
      Prl, failed to do so in hens with LHy or VMN lesions. Lesions in the VMN of 
      incubating hens caused them to leave the nest and suffer a large decline in Prl, 
      both within 48 h. It is tentatively suggested that incubation behavior and its 
      associated elevated Prl are prevented by the POA lesions and that lesions in LHy 
      or VMN, which mimic POA lesion effects, interfere with POA efferents projecting 
      to ME.
FAU - Youngren, O M
AU  - Youngren OM
AD  - Department of Ecology and Behavioral Biology, University of Minnesota, 
      Minneapolis 55455.
FAU - el Halawani, M E
AU  - el Halawani ME
FAU - Phillips, R E
AU  - Phillips RE
FAU - Silsby, J L
AU  - Silsby JL
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Biol Reprod
JT  - Biology of reproduction
JID - 0207224
RN  - 9002-62-4 (Prolactin)
SB  - IM
MH  - Animals
MH  - Electric Stimulation
MH  - Female
MH  - Hypothalamus/*physiology
MH  - *Light
MH  - Preoptic Area/*physiology
MH  - Prolactin/blood
MH  - Radioimmunoassay
MH  - Reproduction/*physiology/radiation effects
MH  - Turkeys/*physiology
MH  - Ventromedial Hypothalamic Nucleus/physiology
EDAT- 1989/10/01 00:00
MHDA- 1989/10/01 00:01
CRDT- 1989/10/01 00:00
PHST- 1989/10/01 00:00 [pubmed]
PHST- 1989/10/01 00:01 [medline]
PHST- 1989/10/01 00:00 [entrez]
AID - 10.1095/biolreprod41.4.610 [doi]
PST - ppublish
SO  - Biol Reprod. 1989 Oct;41(4):610-7. doi: 10.1095/biolreprod41.4.610.