Follicular dynamics and superovulatory response in heifers

Singh, Sudhanshu Pratap; Broadbent, P. J.; Hutchinson, Jsm; Watt, R.G.; Dolman, D.F.

doi:10.1016/0378-4320(96)01480-7

Cited by 7 publications

(7 citation statements)

References 38 publications

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“…The number of CL is related to the number of tertiary follicles in a positive linear manner and the number of medium follicles in a positive quadratic manner. In contrast to this, Singh et al [60] did not find any correlation between the number of follicles observed at the start of the FSH treatment and the number of corpora lutea. Also Fernandez et al [22] found no significant correlation between the follicular population at the beginning of the treatment and the number of ovulations and embryo yield.…”

Section: Conclusion For Practisementioning

confidence: 74%

Superovulation in cattle: practical aspects of gonadotropin treatment and insemination

et al. 2002

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]. 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

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Section: Conclusion For Practisementioning

confidence: 74%

Superovulation in cattle: practical aspects of gonadotropin treatment and insemination

et al. 2002

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“…In addition, various researchers have emphasized that four to six follicles develop together with the starting of the follicular wave, and these follicles can easily be seen with ultrasonography (Pierson and Ginther 1988; Ginther et al. 1989a,b; Singh et al. 1996; Garcia et al.…”

Section: Discussionmentioning

confidence: 99%

“…The use of ultrasonographic techniques for visualizing bovine ovaries has elucidated patterns of follicular development in cattle and provided some insight into the regulation of follicular growth and development (Ginther et al. 1989a, Singh et al. 1996; Garcia et al.…”

Section: Introductionmentioning

confidence: 99%

Number of Follicular Waves and Their Effect on Pregnancy Rate in the Cow

Celik

Aydın

Şendağ

et al. 2005

Reprod Domestic Animals

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In the study, the relationship of follicular growth waves, oestradiol and pregnancy rates were investigated during oestrus cycle in cows. A total of 22, Brown Swiss cows (3-5 years old) were used for the study. The ovaries of animals were examined from sixth day of cycle to next oestrus by ultrasound. The follicles that were present in the ovarium were recorded. Follicular growth was observed every day by means of ultrasound examination. The blood samples were taken for analysis of oestradiol simultaneously with ultrasound examinations. The oestrus animals were inseminated. Each animal that inseminated was examined by ultrasound on day 28 after insemination for pregnancy diagnosis. Two follicular growth waves were observed in nine of 22 (40.9%), three waves in 13 of 22 (59.1%) animals. The oestradiol was found in the same concentration but in different release patterns between two and three waves animals. Pregnancy rate in cows with three and two follicular waves did not differ. In conclusion, emergence of three waves of follicular growth was higher in Brown Swiss cows, the analysis of oestradiol could be used for determination of the wave numbers and the animals with different waves may have had the same pregnancy rates.

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“…Although waves of follicular development in bovines occur in numbers that vary from one to four and the dominant follicle of the last wave is the pre‐ovulatory follicle (Singh et al 1996; Viana et al 1998), in this study, only the development of two or three waves of follicular growth was observed. The average duration of 20.2 ± 0.6 days for cycles with two waves and 22.3 ± 0.9 days for those that presented three waves are similar to those mentioned by Ginther et al (1989) and Figueiredo et al (1997), who found values very close to those of this study for cycles with two and three waves, respectively.…”

Section: Discussionmentioning

confidence: 75%

“…Most oestrous cycles in cattle present two or three waves of follicular growth (Knopf et al 1989; Adams et al 1992). However, in some cycles, only a single wave is observed (Singh et al 1996) and in others, emergence consists of four waves (Sirois and Fortune 1988; Viana et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Ovarian Follicular Dynamics of five-eighths Girolando Cows

Filho¹,

Oliveira²,

Caldas³

et al. 2001

Reprod Domest Anim

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The objective of this study was to examine the follicular dynamics of five-eighths Girolando cows by observing the number of follicular development waves, days of emergence of those waves, diameters of the dominant and largest subordinate follicles and the processes of follicular selection and dominance. Ovarian follicle dynamics were monitored for 24 oestrous cycles in 12 cows, of 4 to 10 years of age, presenting regular oestrous cycles and with body scores between 3 and 4. Ovaries were observed daily for two consecutive oestrous cycles and follicles were measured with ultrasonographic equipment. The dominant follicle was considered to be that which presented a diameter > or = 10 mm for three consecutive days and on the day of wave emergence, when a group of follicles measuring 3-5 mm in diameter would appear. Of the 24 cycles monitored, 62.5% presented two waves of follicular development and 37.5% presented three waves. The cycles presenting two waves had an average duration of 20 days, with the emergence of the waves on days 1 and 9, whereas the cycles presenting three waves had an average duration of 22 days, with emergences on days 1, 10 and 16. For cycles with two waves, both the first and second dominant follicles reached an average size of 13.8 mm, with the first regressing on day 10 and the second ovulating around day 20. For cycles with three waves, the dominant follicles of the first and second waves reached maximum diameters of 11.8 and 12 mm, respectively, with the first regressing on day 11 and the second regressing on day 17. The third dominant follicle reached a maximum diameter of 12.4 mm on day 20, and ovulated on day 22. These results lead to the conclusion that the follicular dynamics of five-eighths Girolando cows are characterized by the presence of two to three waves of follicular growth.

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Follicular dynamics and superovulatory response in heifers

Cited by 7 publications

References 38 publications

Superovulation in cattle: practical aspects of gonadotropin treatment and insemination

Superovulation in cattle: practical aspects of gonadotropin treatment and insemination

Number of Follicular Waves and Their Effect on Pregnancy Rate in the Cow

Ovarian Follicular Dynamics of five-eighths Girolando Cows

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