skip to main content
Idioma:
Primo Advanced Search
Primo Advanced Search Query Term
Primo Advanced Search Query Term
Primo Advanced Search Query Term
Primo Advanced Search prefilters
Busca Simples

Importance of estrus on pregnancy per insemination in suckled Bos indicus cows submitted to estradiol/progesterone-based timed insemination protocols

Sá Filho, M.F ; Santos, J.E.P ; Ferreira, R.M ; Sales, J.N.S ; Baruselli, P.S

Theriogenology, 2011-08, Vol.76 (3), p.455-463 [Periódico revisado por pares]

United States: Elsevier Inc

Texto completo disponível

Citações Citado por
  • Título:
    Importance of estrus on pregnancy per insemination in suckled Bos indicus cows submitted to estradiol/progesterone-based timed insemination protocols
  • Autor: Sá Filho, M.F ; Santos, J.E.P ; Ferreira, R.M ; Sales, J.N.S ; Baruselli, P.S
  • Assuntos: animal ovaries ; Animals ; beef cows ; Cattle - physiology ; equine chorionic gonadotropin ; estradiol ; Estradiol - administration & dosage ; Estradiol - pharmacology ; Estradiol cypionate ; Estrus ; Estrus - physiology ; Female ; GnRH ; gonadotropin-releasing hormone ; insemination ; Insemination, Artificial - methods ; Insemination, Artificial - veterinary ; Nelore ; Ovarian Follicle - diagnostic imaging ; ovulation ; Pregnancy ; pregnancy outcome ; Pregnancy Rate ; progesterone ; Progesterone - administration & dosage ; Progesterone - blood ; Progesterone - pharmacology ; Reproduction ; sodium ; Ultrasonography ; zebu
  • É parte de: Theriogenology, 2011-08, Vol.76 (3), p.455-463
  • Notas: http://dx.doi.org/10.1016/j.theriogenology.2011.02.022
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The objective was to evaluate the effect of estrus occurrence (based on removal of tail-head marks) on ovarian responses and pregnancy per AI (P/AI; 30 d after AI) in suckled Bos indicus beef cows submitted to timed AI (TAI) protocols. Cows received an intravaginal device containing 1.0 g progesterone, and 2.0 mg estradiol benzoate im; 8 d later, the intravaginal device was removed, and they were given PGF₂α (0.25 mg of cloprostenol sodium) and 300 IU of eCG, with TAI 48 to 52 h later. In Experiment 1, cows were assigned to receive one of three treatments: 1 mg of estradiol cypionate (ECP) im at progesterone (P4) device removal (N = 178); 10 μg of GnRH im at TAI (N = 190); or both treatments (N = 172). In cows given estradiol (ECP or ECP + GnRH), more displayed estrus (P = 0.002) and became pregnant (P < 0.0001) compared with those receiving only GnRH. In Experiment 2, the effect of the occurrence of estrus on ovarian responses was evaluated in cows (N = 53) synchronized using ECP at device removal. Cows that displayed estrus had a greater diameter of the largest follicle (LF) at device removal (P < 0.0001), a greater diameter at TAI (P < 0.0001), a greater ovulation rate (P = 0.02), a larger CL (P = 0.02), and a greater P4 concentration (P < 0.0001) than cows that did not display estrus. In Experiment 3, the effect of GnRH treatment on P/AI at TAI was evaluated in cows that received ECP at device removal, and either displayed, or did not display, estrus (N = 726). There was no estrus by GnRH interaction (P = 0.22); the P/AI was greater (P < 0.0001) in cows that displayed estrus (61.9%) than cows that did not display estrus (41.4%). However, GnRH did not improve (P = 0.81) P/AI (GnRH = 53.7% vs. no GnRH = 52.6%). In conclusion, exogenous estradiol at device removal increased both the proportion of suckled Bos indicus cows that displayed estrus and P/AI. Cows that displayed estrus had better ovarian responses (i.e., larger follicles at TAI, a greater ovulation rate, larger CL, and greater P4 concentrations) following an estradiol/P4-based synchronization protocol. Although occurrence of estrus improved pregnancy outcomes, GnRH at TAI did not improve P/AI in suckled Bos indicus cows treated with ECP, regardless of estrus occurrence.
  • Editor: United States: Elsevier Inc
  • Idioma: Inglês
Links
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  7 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.