Follicular dynamics, ovulation and conception rates in bitches.
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2009
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Abstract
Real-time ultrasound imaging was used in a clinical study to estimate the number of follicles of different sizes, ovulation and conception rates, and to study follicle dynamics following oestrus-induction of bitches. Follicles were identified during late anoestrus (between 100 and 60 days prior to the pre-ovulatory LH surge) and there appeared to be a shift in the population from small follicles (1-3 mm in diameter) to large follicles (>4 mm diameter) approximately 2 days prior to the LH surge. Corpora lutea could be reliably identified although the majority were cavitated. High ovulation rates (97-100%) and pregnant rates (86-100%) were detected, and although the conception rate was approximately 70% it varied between 8 and 92%. Within the narrow range of the clinical population studied there were trends relating age to reproduction performance. Oestrus induction with a gonadotrophin regime appeared to result in large numbers of small follicles that did not ovulate, whilst when using cabergoline the number of small and large follicels and the number of copora lutea were similar to those of control cycles.
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Authors | England, G C W;Russo, M;Freeman, S L; |
Journal | reproduction in domestic animals = zuchthygiene |
Year | 2009 |
DOI | 10.1111/j.1439-0531.2009.01416.x |
URL | |
Keywords | Keywords not found |
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