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1

Relationship between follicular profiles prior to the initiation of superovulation and various types of superovulatory responses in cattle

100%
Kohram H., Moakhar H. K.
Bulletin of the Veterinary Institute in Puławy
|
2010
|
tom 54
|
nr 1
29-33
A field experiment was conducted to determine the influence of follicular profiles over 4 d prior to superovulation on superovulatory responses in terms of the number of large follicles (F; ≥ 7mm) at oestrus and in the number of the corpus luteum (CL) 7 d later. Ultrasonography was performed once daily over 4 d prior to gonadotropin treatment (day 0) and on the day of oestrus during superstimulation. Animals conventionally superovulated (400 mg Folltropin-V) between day 8 to 12 of the oestrous cycles and 88 superovulation cycles were considered in the present experiment. Data were analysed by means of the GLM procedure of the SAS. Each type of superovulatory responses was divided into three classes - low, medium, and high. The profiles of changes in the mean diameter of the largest follicle (F1) and in the mean differences between the diameters of F1 and the second largest (F2) follicle (F1-F2) during the 4 d prior to superovulation did not differ (P>0.1) among the three classes of follicular and ovulatory responses. The proportions of superovulation cycles with high follicular and ovulatory responses were 69% and 52%, respectively. The results of the present experiment suggest that high follicular or ovulatory responses are not associated with follicular profiles prior to the initiation of superovulation.
2

Follicular status at initiation day of the superovulatory treatment influences the superovulatory responses in cattle

81%
Kohram H., Ashrafi I., Naijian H.
Bulletin of the Veterinary Institute in Puławy
|
2011
|
tom 55
|
nr 3
The aim of this study was to investigate superovulatory responses of cows according to the status of various follicular classes on day 0 (day of initiation of the superovulatory treatment). One hundred and two superovulation cycles were selected. The animals were superstimulated between days 8 and 12 of oestrous cycle with 400 mg of Folltropin-v given in decreasing doses over a 4 d period and luteolysis was induced with two intramuscular injections of cloprostenol. The ovaries of all cows were examined by ultrasonography on day 0, at oestrus, and on day 7 after oestrus. The results showed that the follicular and ovulatory responses were higher (P<0.0l ) in cows that were superovulated in the presence of a high (≥6) number of follicles than in the presence of a low (≤5) number of follicles 4 to 6 mm in diameter. Follicular and ovulatory responses did not differ according to the status of the three other follicular classes studied. Additionally, the mean numbers of fertilised structures and unfertilised ova were not influenced by the status of any of the follicular classes studied. In conclusion, the follicular and ovulatory responses were influenced by the status at initiation day of the superovulatorv treatment.
3

Differential influence of ampullary and isthmic derived epithelial cells on zona pellucida hardening and in vitro fertilization in ovine

61%
Davachi N. D., Shahneh A. Z., Kohram H., Zhandi M., Shamsi H., Hajiyavand A. M., Saadat M.
Reproductive Biology
|
2016
|
tom 16
|
nr 1
4

A short presynchronization with PGF2α and GnRH improves ovarian response and fertility in lactating Holstein cows subjected to a Heatsynch protocol

61%
Masoumi R., Badiei A., Shahneh A. Z., Kohram H., Dirandeh E., Colazo M. G.
Annals of Animal Science
|
2017
|
tom 17
|
nr 1
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