Progesterone concentration, pregnancy and calving rate in simmental dairy cows after oestrus synchronisation and HCG treatment during the early luteal phase

Autor: Otto Szenci, Tomislav Barna, Svetlana Milanović, Dragan Gvozdić, Ivan Jovanović, Milica Stojić, Sanja Vranješ-Đurić, Natalija Fratrić, Adam Šuluburić
Rok vydání: 2017
Předmět:
0301 basic medicine
medicine.medical_specialty
endocrine system
Pregnancy Rate
oestrus synchronisation
Ice calving
Simmental dairy cows
Luteal phase
Luteal Phase
Chorionic Gonadotropin
Human chorionic gonadotropin
Andrology
Gonadotropin-Releasing Hormone
03 medical and health sciences
Blood serum
Pregnancy
Internal medicine
Medicine
Animals
Insemination
Artificial
Progesterone
2. Zero hunger
Estrous cycle
General Veterinary
Dose-Response Relationship
Drug
business.industry
0402 animal and dairy science
Pregnancy Outcome
Radioimmunoassay
04 agricultural and veterinary sciences
medicine.disease
040201 dairy & animal science
Pregnancy rate
030104 developmental biology
Endocrinology
calving rate
Cattle
Female
pregnancy rate
business
Estrus Synchronization
hormones
hormone substitutes
and hormone antagonists
Zdroj: Acta Veterinaria Hungarica
Popis: Early embryonic development may be negatively affected by insufficient progesterone (P4) production. Therefore, the aim of our study was to increase P4 by gonadotropin-releasing hormone (GnRH) and/or human chorionic gonadotropin (hCG) treatments after inducing oestrus by prostaglandin (PG) treatment. Lactating Simmental dairy cows (n = 110), between 1 to 5 lactations, with an average milk production of 6,500 1/305 days, at 40–80 days postpartum were used and grouped as follows: (1) PG + GnRH treatment at AI (GnRH group), (2) PG + hCG treatment at day 7 after AI (hCG group), (3) PG + GnRH at AI + hCG treatment at day 7 after AI (GnRH/hCG group), and (4) spontaneous oestrus (C: control group). All animals were double inseminated (at the time of oestrus detection and 12 ± 2 h thereafter). Blood serum and milk samples were collected at the day of observed oestrus (day 0), and 14, 21 and 28 days after AI. Serum P4 was determined using a commercial radioimmunoassay (RIA) test (INEP, Zemun), and milk P4 was determined using enzyme-linked immunoassay (ELISA) test (NIV Novi Sad). Pregnancy status was confirmed by ultrasonography between days 28 and 35 after AI. Differences of serum or milk P4 medians, pregnancy (and calving) rate were determined using Dunn’s Multiple Comparison Tests and Z test, respectively. Serum P4 medians were significantly higher at days 14, 21 and 28 after AI in the hCG-treated animals, indicating increased luteal activity, with a similar tendency in whole milk P4 values. Treatment with hCG during the early luteal phase significantly contributed to the maintenance of gestation at days 28–35 after AI, and also increased the calving rate in Simmental dairy cows.
Databáze: OpenAIRE
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