Effect of the sex-linked dwarf gene on circulating levels of 17 beta-estradiol, progesterone and luteinising hormone in the laying hen.
1. The sex-linked dwarf gene did not appear to affect the LH, progesterone (P4) and oestradiol 17-beta (E2) levels around the onset of lay in a sample of White Leghorn hens. 2. A longer interval between oviposition and subsequent ovulation was suggested in dwarf layers by a slower decrease in the P4 plasma concentration after the preovulatory peak and is consistent with the increased oviposition interval already described. 3. A higher ratio of E2/P4 basal levels was found in dwarf layers; this is consistent with their lower number of fast-growing follicles and with their reduced laying rate. 4. Lipid mobilisation was modified in dwarf layers (as shown by their reduced abdominal fattiness); although plasma concentrations of triglycerides were normal, unusual correlations between plasma triglycerides, E2 basal concentrations and body weight were recorded.
Tixier-Boichard
M
M
Institut National de la Recherche Agronomique, Laboratoire de Génétique Factorielle, Jouy-en-Josas, France.
Monvoisin
J L
JL
Rombauts
P
P
Decuypere
E
E
D000818:Animals; D002645:Chickens / Q000097:blood / Q000235:genetics*; D004392:Dwarfism / Q000097:blood / Q000235:genetics / Q000662:veterinary*; D004958:Estradiol / Q000097:blood* / Q000235:genetics; D005260:Female; D005796:Genes; D008040:Genetic Linkage / Q000235:genetics; D007986:Luteinizing Hormone / Q000097:blood* / Q000235:genetics; D010058:Oviposition / Q000235:genetics*; D011374:Progesterone / Q000097:blood* / Q000235:genetics; D013997:Time Factors
D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone