M. Vojgani's research while affiliated with University of Tehran and other places

Publications (29)

Article
There was investigation of whether there were ovulations from co-dominant follicles following eCG administration. In all experiments, there was GnRH injection and CIDR insertion on day 0 (D0), CIDR withdrawal on D8, and cloprostenol administration on D8 (Exp. I and II) or D7 and D8 (Exp. III). Females in the control group were not administered any...
Article
In cattle, results of some but not other studies indicated there has been an association of circulating anti-Müllerian hormone (AMH) concentration with reproductive variables. Considering the inconsistency in results among previous studies, there was evaluation of associations between circulating AMH and reproductive performance in dairy cows, and...
Article
Anogenital distance (AGD), which is an indicator of prenatal androgen exposure, has been reported to have high variability and negative association with fertility in dairy cows. Prenatal exposure to androgens could influence the development of primordial follicles and size of ovarian reserve, which is related to reproduction. However, the relations...
Article
Nutritional partitioning to fetal development differ among nulliparous, primiparous and multiparous cows, leading to birth of smaller calves to nulliparous and primiparous than multiparous dams. The prenatal nutritional state could influence ovarian reserve and fertility in the adult offspring. The effect of maternal parity on ovarian reserve and r...
Article
The objective of this study was to investigate the effect of equine chorionic gonadotropin (eCG) on ovarian follicles at three stages of development (emergence, dominance and early static phases) during the first follicular wave (FFW) in Holstein heifers. Heifers (n=20) were randomly assigned into four experimental groups (n=5 in each group). Heife...
Article
Ovarian reserve has been suggested as an important contributing factor of reproductive success in bovine. Size of ovarian reserve is determined during fetal period and it could be altered by environmental factors, with which the dam is exposed. Maternal heat stress could impair placental function and fetal development; however, there is limited inf...
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Case History Perosomus elumbis, which occurs in ruminants and swines, is characterized by hypoplasia or aplasia of the spinal cord, which ends in the thoracic region. The regions of the body including the hindlimbs, which are normally supplied by the lumbar and sacral nerves, exhibit muscular atrophy, and joint movement does not develop. The rigidi...
Article
Dissimilar distribution of male and female calves within left and right uterine horns has been observed in beef cows. A retrospective study was conducted to investigate the effect of side of pregnancy on secondary sex ratio in Holstein dairy cows. Data associated with sex of calves, side of pregnancy, sire, dam, parity number of dam, AI technician,...
Article
Injection of eCG on Day 6 postpartum could enhance early resumption of ovarian activity in Holstein dairy cows. The present study was conducted to investigate the effects of eCG treatment on Day 6 postpartum on reproductive performance of Holstein dairy cows. Holstein dairy cows (n = 420) were randomly assigned to two groups. Cows in eCG-treated gr...
Article
Various factors including synchronization treatments have been reported to influence sex ratio of offspring in cattle. The present study was conducted to investigate the effect of treatment with Presynch-Ovsynch protocol on sex ratio of offspring in Holstein dairy cows. Healthy Holstein cows (N = 1102) were randomly assigned to Presynch-Ovsynch (N...
Article
BACKGROUND: Retained fetal membrane decreases reproductive performance of dairy cows. OBJECTIVES: The objective of this study was to evaluate the effect of Presynch Ovsynch protocol on reproductive performance of retained fetal membrane cows in Iranian dairy farm. METHODS: This experiment accomplished on 244 Holstein dairy cows of a commercial dair...
Article
BACKGROUND: Postpartum anestrus is a major problem in primiparous dairy cows. OBJECTIVES: The objective of this study was to investigate postpartum ovarian activity in primiparous Holstein dairy cows. METHODS: Seven primiparous Holstein dairy cows were monitored for ovarian activity using a combination of ultrasound examination and alteration in pr...
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Thyroid disease and asthma, both being common conditions, occasionally occur simultaneously. The aim of the present study was to determine the effects of experimental thyroid dysfunction on the reactivity of isolated trachea. Male, adult guinea pigs were placed into three groups of euthyroid (EUT), hyperthyroid (HRT) and hypothyroid animals (HOT)....
Article
The purpose of the present study was to hasten the resumption of ovarian activity early postpartum in lactating dairy cows, using equine chorionic gonadotropin (eCG), to enhance follicular growth, followed by hCG, to induce ovulation. Primiparous Holstein dairy cows (n=21) were assigned equally into eCG, eCG-hCG and Control groups. Cows in the eCG...
Article
It has been demonstrated that heat stress has a detrimental effect on conception rate of dairy cows, via early embryonic death. To reduce heat stress, providing shade, fan, appropriate diet and application of ovulation induction agents (GnRH and hCG) is recomended. Endogen PGF 2α has positive effect on ovulation. Repeat Breader. The aim of the pres...
Article
The effect of a short pre-treatment with a GnRH antagonist (Cetrorelix acetate) and the induced superovulation response was evaluated in goats. A total of 16 nanny goats were allocated to two groups. The goats in the antagonist treatment group (n=8) received 6 doses of the GnRH antagonist, once daily, as a pre-treatment to superovulation. The does...
Article
An investigation was under taken to evaluate the out of season reproduction performance of ewe. A flock consisting 119 ewes was synchronized via implementation CIDR over a period of 12 days, following by injection of PMSG (400 IU). The ewes inseminated and divided to three experimental groups. Group1: Injection of GnRH (5ml) at day 12 post insemina...
Article
An experiment was conducted to evaluate the impact of melatonin on scrotal circumference and semen parameters using 8 shall rams in April until June 2004 (out of season). In the April, the rams were randomly allocated in two groups. Four animal received 3 implants of melatonin tablets (totally 54 mg/ram) at the base of ear and the other 4 rams were...
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Full-text available
We conducted a retrospective cohort study to investigate factors influencing the reproductive performance of dairy cattle in Khorosan Razavi province, Iran. Ten dairy herds, located within a 45 km radius of the city of Mashhad in Khorosan Razavi province took part in the study. Complete lactation records were collected for cows that calved between...
Article
The effect of short term usage of GnRH antagonist as pretreatment on superovulation in goats was evaluated. Statistical analysis was performed using t-test and showed that usage of GnRH antagonist as pretreatment can improve number of recovered embryos (p<0.05), but there were no statistically difference between treatment group versus control group...
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Full-text available
The aim of this study was to investigate the effects of Ramadan fasting on neutrophil's respiratory burst and circulating immune complex (CIC) level. The effects of Ramadan fasting on neutrophil's respiratory burst and CIC was studied in 21 normal young fasting Muslim individuals using standardized chemiluminescence and poly ethylene glycol methods...
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Fasting during the month of Ramadan is one of the essential religious practices of Muslims. The aim of this study was to evaluate opsonisation, phagocytosis, and nitroblue tetrazolium (NBT) reduction by white blood cells in normal, healthy, male subjects under non-fasting (before Ramadan) and fasting (after Ramadan) conditions. In this study, 13 Mu...
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Full-text available
To study the possible changes, neutrophils in 24 normal male Muslim adults were measured and compared before and after Ramadan, using chemiluminescence method. There were no significant effects of fasting on blood neutrophil function during Ramadan. Fasting during holy month of Ramadan does not change neutrophil functions and has no hazardous effec...
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Full-text available
Fasting during Ramadan represent one of the five pillars of the Islamic religion. So it is important to know the effect of this kind of fasting on people's life especially on their health. The purpose of this study was to show the effect of fasting during Ramadan on circulating immune complex (CIC) level and immune system. The CIC levels were measu...
Article
A total of 810 dairy cattle were blood sampled and used to evaluate serological screening for Neospora caninum infection in dairy cattle herds in Mashhad (Khorasan province, Iran). In 4 herds, of the 810 cattle, 123 (15.18%) were seropositive by IFA Test (VMRD Inc., Pullman, WA 99163, USA) with titer 1:200 and range of prevalence per herd from 9.92...

Citations

... The size of the follicle at the time of GnRH-induced ovulation influenced the formation and maintenance of pregnancy in beef cattle [16,67,74]. In postpartum beef cows and beef heifers, GnRH-induced ovulation from a tiny dominant follicle (<11.33 mm) was linked with a lower pregnancy rate and late embryonic/ fetal survival compared to GnRH-induced ovulation from a large dominant follicle [75][76][77]. ...
... Gobikrushanth et al. (2017) recently characterized AGD in Canadian Holstein cows and reported a greater pregnancy per AI and cumulative pregnancy risk by 250 DIM in first-and second-parity cows with short AGD (≤127 mm) than in those with long AGD (>127 mm). Other studies have also reported such inverse associations between AGD and indices of fertility in dairy cattle (Akbarinejad et al., 2019;Carrelli et al., 2021Carrelli et al., , 2022Grala et al., 2021). A heritability estimate of 0.37 was later reported for AGD in Irish Holstein-Friesian cows (Gobikrushanth et al., 2019). ...
... The basic statistical model for traits included fixed effects of three birth years, four ages of dams of the heifers (2, 3, 4, or 5 years and older), two heifer development diets, and a regression coefficient for age at measurement when appropriate. Age of dam of the heifer was included in the model because in previous studies age of the dam has influenced reproductive performance of heifers [21,22]. Sire of the heifer was included as a random effect. ...
... Although eCG is a luteinizing hormone (LH) in equidae, it acts as both follicular stimulating hormone (FSH) and LH in other animal species (12,26). The follicular development and ovulation in cows can be stimulated by its parenteral administration (17,41). It has been reported that eCG administered on day 6 pp is effective in early stimulation of ovarian activity and increases fertility by decreasing the calving-to-conception interval (32,45). ...
... Heat stress is known to impact maternal reproductive health and performance during gestation (recently reviewed by Alves et al., 2020;Van Wettere et al., 2021), but recent studies in dairy cattle indicate it may have lasting effects on adult offspring fertility as well. Indeed, animals whose dams were exposed to heat stress during gestation had longer days to first service, calving to conception interval, greater culling rate, and reduced Anti-Mullerian hormone (AMH) concentrations (Akbarinejad et al., 2017). A study in dairy cows found that heat stress did not appear to effect age of first insemination and parturition but did result in an increase in the number of services per pregnancy, increased age at pregnancy, and fewer calves survived to their first lactation (Monteiro et al., 2016). ...
... Some studies note improvements in testicular size 69 , sperm motility 29,33,69 and concentration 69 . On the contrary, these parameters have also exhibited no corresponding change to melatonin treatment 31,[70][71][72] . This study aimed to clarify these discrepancies by utilising a relatively large sample size and biweekly measurements over a long-term period. ...
... In this study, the mean CI was 419 ± 83 d and the overall average DO was 136 d was consistent with the previous reports for Holstein cows in Iran (Bahonar et al. 2009;Ansari-Lari et al. 2010). However, it is longer than the optimal value of 400 and 117 days which was respectively reported for CI and DO in dairy farms with appropriate reproductive management (González-Recio and Alenda, 2005;Hare et al. 2006;Atashi et al. 2012). ...
... The overall sex ratio was similar to reported in literature for zebu cattle [35] and evaluating the hypothetical sexual predilection, or differences in the distribution of sexes between the uterine horns, the present results are similar to those presented by Silveira et al. [36] for dairy cattle, where there was no presumed interference of the uterine horn on the sex of the fetus. Gharagozlou et al. [37] also studying dairy herds, also did not find differences between the distributions of males and females between the uterine horns. In contrast, for beef cattle, the sex ratio of fetuses have been shown to be different between skewing toward females in the left uterine horn, whereas it was skewed toward males in the right uterine horn [15,25]. ...
... It was revealed that PMSG injection six days after calving improved the first-service conception rate (FSCR) even though it did not affect the estrus expression of cows after the commencement of the Presynch-Ovsynch protocol. Consistent with our finding, Vojgani et al. (2013) found a positive impact of PMSG injection six days postpartum on the fertility of cows that were not assigned to ovulation synchronization protocols after parturition. An earlier study indicated that the injection of PMSG on day six postpartum stimulated follicular growth, augmented the proportion of cows that ovulated by day 20 postpartum, and advanced resumption ovarian activity after parturition (Rostami et al., 2011). ...
... Some researchers used hCG for ovulation induction, evaluating follicular and luteal characteristics and serum progesterone concentrations in eCG-superovulated does (Kelidari et al., 2010) and pharmacokinetics after i.m. administration (Saleh et al., 2012). Many researchers used GnRH for improving the synchrony of timing of the LH surge and ovulation (Pierson et al., 2003), pregnancy rate and litter size (Riaz et al., 2012), homogeneity in development of the embryos collected (Baldassarre et al., 2004) and pretreatment for improving superovulation response and embryo recovery (Heidari et al., 2010). Some researchers used hCG and GnRH for evaluating premature luteal regression in eCG superovulated does (Saharrea et al., 1998), for improving ovarian function, conceptus growth and development (Khan et al., 2007) and pregnancy and lambing in ewes (Kaya et al., 2013). ...