[Application of gonadotropin releasing hormone in dairy herds with fertility disturbances with regard to milk yield data and metabolic parameters].
The presented study was made to determine the factors influencing the fertility supporting effect of GnRH application at the time of insemination in a dairy herd with fertility problems. The metabolic parameters considered influencing conception results were milk yield, milk protein and milk fat and for blood parameters Urea, GOT and Bilirubin. The total effect of GnRH consisted in an improved pregnancy rate by 18.8% compared to the non treated control group. The improvement of pregnancy rate was observed mainly in groups with an adequate supply of energy at the time of insemination. Therefore the use of GnRH at insemination time is more successful, when milking test data and blood parameters are taken into account and indicate an equilibrated supply in energy. To explain these effects endocrinological regulation models are discussed.
von Straaten
H
H
Tierklinik für Fortpflanzung, Freie Universität Berlin.
Klocke
P
P
Lange
A
A
von Fehrn
S
S
Glatzel
P
P
D000818:Animals; D001219:Aspartate Aminotransferases / Q000097:blood; D001663:Bilirubin / Q000097:blood; D002417:Cattle; D002418:Cattle Diseases; D005260:Female; D005298:Fertility / Q000187:drug effects*; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D007247:Infertility, Female / Q000503:physiopathology / Q000662:veterinary*; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary*; D007774:Lactation; D008055:Lipids / Q000032:analysis; D008892:Milk / Q000737:chemistry / Q000378:metabolism*; D011247:Pregnancy; D011256:Pregnancy Outcome; D011270:Pregnancy, Animal / Q000502:physiology*; D014508:Urea / Q000097:blood
D008055:Lipids; D007987:Gonadotropin-Releasing Hormone; D014508:Urea; D001219:Aspartate Aminotransferases; D001663:Bilirubin