Πλοήγηση ανά Συγγραφέα "Valasi, I."
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Administration of a long-acting antiparasitic to pre-pubertal ewe-lambs in Greece results in earlier reproductive activity and improved reproductive performance
Mavrogianni, V. S.; Papadopoulos, E.; Fragkou, I. A.; Gougoulis, D. A.; Valasi, I.; Orfanou, D. C.; Ptochos, S.; Gallidis, E.; Fthenakis, G. C. (2011)We studied the reproductive effects of administration of a long-acting antiparasitic (moxidectin) given to pre-pubertal ewe-lambs in Greece at the beginning of the reproductive season. 45 animals, naturally infected with ... -
Age, FSH dose and follicular aspiration frequency affect oocyte yield from juvenile donor lambs
Valasi, I.; Leontides, L.; Papanikolaou, T.; Amiridis, G. S. (2007)Experiments were conducted to determine the effects of lamb age, frequency of follicular aspirations, and hormone stimulation by fixed or variable FSH dose, on the number of collected oocytes and their maturational competence. ... -
The application of in vitro fertilization techniques for the evaluation of ram fertility
Papadopoulos, S.; Theodosiadou, E.; Kantas, D.; Valasi, I. (2015)The prediction of field fertility of a given ram by using in vitro tests would be of great importance for the reproductive management in sheep flocks. There are many in vitro procedures available for evaluating semen quality ... -
Effect of progestagen pretreatment on fertility of ewes
Valasi, I.; Theodosiadou, E.; Deligiannis, C.; Papadopoulos, S.; Kantas, D.; Amiridis, G. S. (2010) -
The effect of repeated follicular aspiration on the onset of puberty and growth rate of winter- or autumn-born lambs
Valasi, I.; Fthenakis, G. C.; Prassinos, N. N.; Menegatos, I.; Grigoropoulou, V.; Deligiannis, C.; Vainas, E.; Amiridis, G. S. (2009)The effects of follicular aspiration for oocyte retrieval on the attainment of puberty and growth rate were studied in winter-born (9 treated and 6 control) and autumn-born (5 treated and 5 control) ewe lambs. In the treated ... -
Effect of the time of artificial insemination on fertility of short-term progestagen pre-treated Karagouniko and Chios ewes
Papadopoulos, S.; Valasi, I.; Deligiannis, C.; Theodosiadou, E.; Kantas, D.; Goulas, P. (2012) -
Effect of treatment of GnRH and non-selective inhibitor of phosphodiesterase on fertility of ewes
Valasi, I.; Ppapadopoulos, S.; Chadio, S.; Theodosiadou, E.; Kalogiannis, D.; Mavrogianni, V.; Spanos, S.; Fthenakis, G.; Amiridis, G. (2012) -
Effects of melatonin treatment on follicular development and oocyte quality in Chios ewes - Short communication
Tsiligianni, T.; Valasi, I.; Cseh, S.; Vainas, E.; Faigl, V.; Samartzi, F.; Papanikolaou, T.; Dovolou, E.; Amiridis, G. (2009)Follicular development and oocyte quality were assessed by laparoscopic observation and in vitro fertilisation, respectively, in melatonin-treated (Group M) and control (Group C) anoestrous Chios ewes (n = 10 in each group). ... -
Endocrinological profile and follicular development in cyclic ewes subjected to repeated ovum pick-up
Valasi, I.; Theodosiadou, E.; Fthenakis, G. C.; Papanikolaou, T.; Deligiannis, C.; Kalogiannis, D.; Chadio, S.; Amiridis, G. S. (2013)Blood concentrations of progesterone, FSH and oestradiol in Karagouniko ewes subjected to laparoscopic ovum pick-up (OPU) at specific stages of induced oestrous cycle, were measured. Twenty-four cyclic ewes were randomly ... -
Follicular Development after Repeated Ovum Pick-up (OPU) in Cyclic Ewes
Valasi, I.; Papanikolaou, T. H.; Tsiligianni, T. H.; Theodosiadou, E.; Kantas, D.; Deligiannis, C.; Amiridis, G. S. (2008) -
Health management of ewes during pregnancy
Fthenakis, G. C.; Arsenos, G.; Brozos, C.; Fragkou, I. A.; Giadinis, N. D.; Giannenas, I.; Mavrogianni, V. S.; Papadopoulos, E.; Valasi, I. (2012)The objectives of health management of ewes during pregnancy are as follows: (i) successful completion of pregnancy at term, (ii) birth of healthy and viable lambs, with optimal birth and potential weaning bodyweight, (iii) ... -
Luteal stage dependence of pituitary response to gonadotrophin-releasing hormone in cyclic dairy ewes subjected to synchronisation of ovulation
Amiridis, G. S.; Valasi, I.; Menegatos, I.; Rekkas, C.; Goulas, P.; Papanikolaou, T.; Deligiannis, C. (2005)Possible hormonal aberrations precluding conception or maintenance of pregnancy in dairy ewes subjected to ovulation synchronisation were investigated in this study. The pituitary response to exogenous gonadotrophin-releasing ... -
Management of pre-pubertal small ruminants: Physiological basis and clinical approach
Valasi, I.; Chadio, S.; Fthenakis, G. C.; Amiridis, G. S. (2012)Puberty is a gradual process, during which animal reproductive competence is attained with respect to physiology, morphology and behaviour. Onset of puberty in small ruminants differs between sexes, due to early sexual ... -
Oestradiol concentration as a predictor of ovarian response in FSH stimulated ewe-lambs
Valasi, I.; Leontides, L.; Menegatos, I.; Amiridis, G. S. (2007)We investigated the prediction of ovarian response using oestradiol determination, in 37 gonadotrophin stimulated Karagouniko ewe-lambs. Ovarian stimulation was induced by serial FSH administrations, and laparoscopic ... -
Oocyte pick-up in juvenile lambs affects neither onset of puberty nor their future fertility
Valasi, I.; Menegatos, I.; Papanikolaou, Th; Goulas, P.; Amiridis, G. S. (2006)A study was designed to evaluate whether the time of onset of puberty and fertility of young ewe lambs would be affected by oocyte pick-up conducted in single or repeated sessions during the first months of lambs' live. ... -
Pituitary response to gonadotrophin-releasing hormone in melatonin treated ewes
Valasi, I.; Tsiligianni, T.; Cseh, S.; Menegatos, I.; Amiridis, G. S. (2007) -
Pregnancy toxaemia as predisposing factor for development of mastitis in sheep during the immediately post-partum period
Barbagianni, M. S.; Mavrogianni, V. S.; Katsafadou, A. I.; Spanos, S. A.; Tsioli, V.; Galatos, A. D.; Nakou, M.; Valasi, I.; Gouletsou, P. G.; Fthenakis, G. C. (2015)Objective of the work was to evaluate the potential predisposing role of pregnancy toxaemia in development of mastitis in the immediately post-partum period. Ewes were allocated in subgroups A1 or A2 (with pregnancy toxaemia) ... -
Synchronization of ovulation and fixed time intrauterine insemination in ewes
Deligiannis, C.; Valasi, I.; Rekkas, C. A.; Goulas, P.; Theodosiadou, E.; Lainas, T.; Amiridis, G. S. (2005)A novel method for oestrus-ovulation synchronization in sheep followed by fixed time insemination is presented herewith. Mature dry ewes (n = 28) of Karagouniko breed being at an unknown stage of the oestrous cycle, were ... -
Ultrasonographic findings in the ovine udder during involution
Petridis, I. G.; Gouletsou, P. G.; Barbagianni, M. S.; Amiridis, G. S.; Brozos, C.; Valasi, I.; Fthenakis, G. C. (2014)The objective of the study was to record, by means of ultrasonographic examination, changes occurring in the udder of ewes during involution and to compare differences between progressive or abrupt udder drying-off. In ... -
Ultrasonographic findings in the ovine udder during lactogenesis in healthy ewes or ewes with pregnancy toxaemia
Barbagianni, M. S.; Gouletsou, P. G.; Valasi, I.; Petridis, I. G.; Giannenas, I.; Fthenakis, G. C. (2015)Objective of the study was to record, by means of ultrasonographic examination, changes occurring during lactogenesis in the udder of healthy ewes and of ewes with pregnancy toxaemia. The work was carried out in 28 ewes, ...