The effect of buserelin injection 12 days after insemination on selected reproductive characteristics in cows


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Ataman M. B., Erdem H., BÜLBÜL B., Umutlu S., Colak M.

ACTA VETERINARIA BRNO, vol.80, no.2, pp.171-177, 2011 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 80 Issue: 2
  • Publication Date: 2011
  • Doi Number: 10.2754/avb201180020171
  • Journal Name: ACTA VETERINARIA BRNO
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.171-177
  • Keywords: GnRH, plasma progesterone, pregnancy, embryonic death, cow, GONADOTROPIN-RELEASING-HORMONE, LACTATING DAIRY-COWS, ARTIFICIAL-INSEMINATION, FOLLICULAR DYNAMICS, ESTROUS-CYCLE, GNRH, CATTLE, ESTRUS, SYNCHRONIZATION, PROGESTERONE
  • Dokuz Eylül University Affiliated: No

Abstract

The aim of this study was to evaluate the effect of buserelin injection on day 12 postinsemination on fertility in lactating dairy cattle. A total of 57 cows were assigned to two groups and four subgroups. In the treatment group, the cows were synchronized with PGF(2 alpha)-PGF(2 alpha) (group A) or GnRH-PGF(2 alpha) (group B) protocol, and buserelin was injected on day 12 postinsemination. Cows in the control group were synchronized with PGF(2 alpha)-PGF(2 alpha) (group C) or GnRH-PGF(2 alpha) (group D) protocol, saline solution was injected on day 12, and served as controls. Pregnancy rates on day 21 and 45 and embryonic death rates were 85.7%, 71.4% and 16.7%, 85.7%, 85.7% and 0.0%, 73.3%, 62.1% and 27.3% and 85.7%, 71.4% and 16.7% in groups A, B, C and D, respectively. There was no significant difference between synchronization protocols for pregnancy rates, and among groups A, B, C and D for pregnancy rates and embryonic death rates. Mean progesterone concentrations in pregnant cows in groups A and B were higher than that in groups C and D, respectively, on day 18 and 21 (p < 0.05). In conclusion, GnRH injection on day 12 postinsemination increased the plasma progesterone concentrations on day 18 and 21 postinsemination. However, it did not alter the pregnancy rates and prevent embryonic deaths.