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Effects of eCG are more pronounced in primiparous than multiparous Bos indicus cows submitted to a timed artificial insemination protocol

Sales, J.N.S. ; Bottino, M.P. ; Silva, L.A.C.L. ; Girotto, R.W. ; Massoneto, J.P.M. ; Souza, J.C. ; Baruselli, P.S.

Theriogenology, 2016-12, Vol.86 (9), p.2290-2295 [Periódico revisado por pares]

United States: Elsevier Inc

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  • Título:
    Effects of eCG are more pronounced in primiparous than multiparous Bos indicus cows submitted to a timed artificial insemination protocol
  • Autor: Sales, J.N.S. ; Bottino, M.P. ; Silva, L.A.C.L. ; Girotto, R.W. ; Massoneto, J.P.M. ; Souza, J.C. ; Baruselli, P.S.
  • Assuntos: Animals ; Cattle ; Chorionic gonadotropin ; Chorionic Gonadotropin - pharmacology ; Conception ; Estrus Synchronization ; Female ; Insemination, Artificial - veterinary ; Ovarian Follicle - drug effects ; Ovary ; Parity ; Pregnancy ; Progesterone - administration & dosage ; Progesterone - pharmacology ; Reproduction ; Time Factors
  • É parte de: Theriogenology, 2016-12, Vol.86 (9), p.2290-2295
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-News-1
    ObjectType-Feature-3
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  • Descrição: The effects of eCG on follicular growth, ovulation, and pregnancy per artificial insemination (P/AI) in multiparous and primiparous Bos indicus beef cows submitted to timed artificial insemination (TAI) were evaluated in three experiments. In experiments 1 (follicular responses; n = 64), 2 (follicular growth and ovulation rate; n = 662), and 3 (P/AI; n = 2092), cows submitted to TAI were assigned to receive one of two treatments on Day 8 of the synchronization protocol: control (no additional treatment) or eCG (300-IU of eCG intramuscularly). In experiment 1, largest follicle (LF) diameter on Day 8 (P = 0.56) and the interval from progesterone (P4)-device removal to ovulation (P = 0.79) did not differ between treatments. However, the maximum diameter of the LF (P = 0.05) and ovulation rate (P = 0.03) were greater in cows that received eCG. In experiment 2, the diameter of the LF on Day 10, follicular growth, and ovulation rate were greater in eCG-treated cows (P < 0.01). However, CL diameter was similar between treatments (P = 0.11). In experiment 3, there was a treatment-by-parity interaction (P = 0.003) on P/AI, such that treatment with eCG was more effective in primiparous cows. In conclusion, eCG treatment resulted in increased final follicular growth, ovulation rate, and fertility in B indicus cows submitted to TAI protocols, especially in primiparous cows.
  • Editor: United States: Elsevier Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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