The effect of luteinizing hormone releasing hormone (L.H.R.H.) on serum L.H. and ovarian growth in turkeys.
Serum L.H. of non-laying hens (NL.) was significantly higher than serum LH of layers (L.). All NL. hens  showed a marked increase in serum L.H. within 5 min. of an i.v. injection of 20 or 40 micrograms of L.H.R.H. The L.H. levels of NL. hens were significantly lower at 15 min. after L.H.R.H. injection than at 5 min. The laying turkeys were erratic in their response, with clear cut, small rises in L.H. occurring only in some individuals with hard shelled eggs in utero. Hens with membranous eggs or with empty uteri failed to respond to the L.H.R.H. While F.S.H./L.H. injections caused significant ovarian and oviducal growth, L.H.R.H. given by daily i.m. injection for 7 days or twice daily i.v. injection for 6 days failed to do so. Subcutaneous implants of 1 mg. of L.H.R.H. in polyacrylamide gel led to prolonged elevation in serum L.H.R.H. and increased serum L.H. for about 12 hr. but caused no change in ovarian or oviducal weights.
D000818:Animals; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000494:pharmacology*; D007986:Luteinizing Hormone / Q000097:blood*; D010053:Ovary / Q000254:growth & development*; D010057:Oviducts / Q000254:growth & development; D010058:Oviposition; D011374:Progesterone / Q000097:blood; D014422:Turkeys / Q000502:physiology*
D007987:Gonadotropin-Releasing Hormone; D011374:Progesterone; D007986:Luteinizing Hormone