Superovulation in cattle: practical aspects of gonadotropin treatment and insemination

Abstract

]. Kanitz et al. [32] showed for FSH that with increasing doses the number of ovulations increases significantly until a plateau was reached for the parameter. It was not possible to increase ovulation number DOSE-RESPONSE RELATIONSThe ovulation number and the following number of recovered oocytes and embryos show a dose-dependent pattern. This was partly or fully shown for hMG [47] Abstract -Embryo transfer (ET) in cattle has been used for the realisation of breeding programmes world-wide for more than 20 years. The efficiency of breeding technology, i.e. the breeding progress and costs, depends to a large extent on the results of superovulatory treatment and artificial insemination (A.I.). The results of this step are characterised by a high degree of variation. Numerous attempts have been undertaken to explain the reason(s) for this. Numerous attempts have also been made to clarify the importance of different factors affecting the results. Undoubtedly, the applied hormones and the scheme of insemination itself are main factors, which influence the number and the portion of transferable embryos. Therefore this paper is focused on the following aspects of superovulatory treatment with FSH: dose-response relations, bioactivity of the glycoprotein, FSH/LH ratio, ovulation time and time-oriented insemination, frequency of gonadotropin administration and follicular population at the time of gonadotropin application.cattle / superovulation / FSH / follicles / ovulation / time-oriented insemination Reprod. Nutr. Dev. 42 (2002) 587-599 587

The effect of single epidural plus intramusculer injection of FSH on superovulatory response in Anatolian Black cow

“…It has been reported that a single im and sc injections of FSH has the same effects with twice daily FSH treatments (1,21,35,43). In the present study, the proportion of transferable embryo yield also showed no significant difference among treatment groups.…”

Short Communication. Embryo yield in llamas synchronized with two different intravaginal progesterone-releasing devices and superovulated with eCG

“…Several research groups have looked for possible associations between endogenous (natural luteal phase) or exogenous progesterone priming (treatment used to control the ovarian follicular dynamics) and the response to superovulation as a potential explanation for some of the persistent variability in superovulation seen between animals (Kanitz et al, 2002;Mapletoft et al, 2002). In this study, the aim was to investigate any differences in quantity and quality of embryos produced in response to either DIB or Cronipres progesterone ID combined with eCG for ovarian superstimulation in llamas.…”

Preparation of Biologically Active Recombinant Buffalo Follicle Stimulating Hormone (rbuFSH) from Buffalo pituitaries

“…FSH has conventionally been derived from pituitary tissue, despite concerns that include contamination with other pituitary hormones such as LH [10,11], batch-to-batch variation [10,12], and potential to spread diseasecausing agents [10,11]. Initially, recombinant gonadotropins such as FSH were produced as two separate subunits oligomerized after synthesis [13,].…”