scholarly journals Frozen–thawed embryo transfers in natural cycles with spontaneous or induced ovulation: the search for the best protocol continues

2016 ◽  
Vol 31 (12) ◽  
pp. 2803-2810 ◽  
Author(s):  
M. Montagut ◽  
S. Santos-Ribeiro ◽  
M. De Vos ◽  
N.P. Polyzos ◽  
P. Drakopoulos ◽  
...  
Keyword(s):  
Induced Ovulation ◽  
Natural Cycles

scholarly journals Induced ovulation, mating success and embryonic development in the stripe-faced dunnart, Sminthopsis macroura

Reproduction ◽  
2001 ◽  
pp. 777-783 ◽  
Author(s):  
DE Hickford ◽  
NE Merry ◽  
MH Johnson ◽  
L Selwood
Keyword(s):  
Oocyte Maturation ◽  
Mating Success ◽  
Luteal Phase ◽  
Intermediate Phase ◽  
Corpora Lutea ◽  
Induced Ovulation ◽  
Ovarian Histology ◽  
Sminthopsis Macroura ◽  
Combined Data ◽  
Natural Cycles

Induced ovulation resulting in normal embryos is rare in marsupials. In this study natural and induced ovulations were compared in mature Sminthopsis macroura (n = 122). Comparison of maturation of preovulatory oocytes by ovarian histology and examination of oocytes removed from developing follicles in 12 ovaries of 23 animals receiving 0.058 iu equine serum gonadotrophin (eSG) g(-1) with ovaries of 12 animals undergoing natural cycles showed that oocyte maturation was significantly more irregular when it was induced (P < 0.001). Postovulatory stages were examined by estimating the number of eggs ovulated from ovarian histology, and by counting oviduct and uterine contents recovered after ovulation. S. macroura receiving 0.087 iu eSG g(-1) (n = 34), administered as one (n = 17) or two (n = 17) injections, were significantly (P < 0.05) more likely to ovulate (74%), mate (80%) and have conceptuses (66%) than were animals receiving 0.058 iu eSG g(-1) (12, 53 and 0%, respectively) (n = 17), and the values were similar to those in animals (n = 36) undergoing natural cycles (100, 81 and 56%, respectively). Induced ovulation using 0.087 iu eSG g(-1) yielded significantly (P < 0.05) more oocytes per ovary (20.8 +/- 8.5; combined data) than did ovulation in animals undergoing natural cycles (13.7 +/- 3.2) (ANOVA, t test). The responses of animals induced in different phases of the oestrous cycle with 0.087 iu eSG g(-1) were not significantly different (ANOVA) with respect to the number of corpora lutea per ovary, conceptuses per animal or days to ovulation after injection. However, the proportion of females that responded after receiving 0.058 iu eSG g(-1) in the luteal phase was significantly different from that in animals treated with the same dose in the intermediate phase (P < 0.01) and in non-cyclic females treated with 0.058 iu eSG g(-1) (P < 0.02). The main benefits of the treatment were that normal embryos resulted and that 70-78% of non-cyclic animals could be induced to ovulate.

scholarly journals Induced ovulation mimics the time-table of natural development in the stripe-faced dunnart, Sminthopsis macroura and results in the birth of fertile young

Reproduction ◽  
2010 ◽  
Vol 139 (2) ◽  
pp. 419-425 ◽  
Author(s):  
Phil Chi Khang Au ◽  
Angela Nation ◽  
Marissa Parrott ◽  
Lynne Selwood
Keyword(s):  
Captive Breeding ◽  
Induced Ovulation ◽  
Initial Injection ◽  
Time Table ◽  
Serum Gonadotropin ◽  
Sminthopsis Macroura ◽  
Reproductive Females ◽  
Genetic Pool ◽  
Effective Conservation ◽  
Natural Cycles

Induced ovulation maximizes captive breeding success, increasing productivity and facilitating the contribution of otherwise infertile animals to the genetic pool. In marsupials, induced ovulation to produce fertile young is unknown. Here we present an induction protocol efficient in inducing non-cycling and non-reproductive females to cycle, mate, ovulate, and conceive. Ovulation was induced in Sminthopsis macroura using an initial injection of 0.06 IU equine serum gonadotropin (eSG)/g (time 0), followed on day 4 by 0.04 IU eSG/g. Using this induction regime, the timing of follicular and embryonic development mimics natural cycles and results in the birth of viable, fertile young. Response to induction is not significantly affected by animal age, making this protocol an effective conservation tool. We have established a time-table of development following induction, providing a source of precisely timed research material. This is the first induced ovulation protocol in any marsupial to result in demonstrated fertile offspring and to allow the reliable collection of known-age samples during both the follicular phase and the gestation period.

Induced ovulation in coho salmon (Oncorhynchus kisutch). I. Further studies on the use of salmon pituitary preparations

Aquaculture ◽  
1981 ◽  
Vol 26 (1-2) ◽  
pp. 117-127 ◽  
Author(s):  
George A. Hunter ◽  
Edward M. Donaldson ◽  
Helen M. Dye
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Induced Ovulation

Natural cycles yield better outcomes than hormonally manipulated artificial cycles after transfer of vitrified/warmed blastocysts

2010 ◽  
Vol 94 (4) ◽  
pp. S166
Author(s):  
E. Chang ◽  
M. Kim ◽  
J. Han ◽  
H. Won ◽  
W. Lee ◽  
...  
Keyword(s):  
Natural Cycles

scholarly journals Characteristics of human ovulation in natural cycles correlated with age and achievement of pregnancy

2001 ◽  
Vol 16 (12) ◽  
pp. 2501-2507 ◽  
Author(s):  
Misao Fukuda ◽  
Kiyomi Fukuda ◽  
Claus Yding Andersen ◽  
Anne Grete Byskov
Keyword(s):  
Natural Cycles
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