Ovulation Day After Onset of Vulval Bleeding in a Beagle Colony

Hori, Tatsuya; Tsutsui, Toshihiko; Amano, Yoko; Concannon, P W

doi:10.1111/rda.12076

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…In dogs, ovulation occurs 2 days after the LH surge and on average 3 days after the onset of oestrus. A recent study of 390 oestrus cycles in 102 bitches in our beagle colony (Hori et al 2012) examined the interval from the onset of proestrus, that is, first day of observed vulval serosanguinous discharge to the day of ovulation estimated from the plasma progesterone (P 4 ) concentrations. The interval between vulval bleeding and ovulation ranged from 3 to 31 days and averaged 11.1 ± 0.2 (SE) days.…”

Section: Introductionmentioning

confidence: 99%

Ovulation Compensatory Function After Unilateral Ovariectomy in Dogs

Tsutsui¹,

Hori

Takahashi

et al. 2012

Reprod Domestic Animals

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Contents As a step towards elucidation of the timing and mechanism of the determination of the number of ovulated ova in dogs, we excised one ovary 2, 5 and 8 days after the beginning of vulval bleeding and examined whether the lost ovulation function, assessed by estimating the number of ovulated oocytes, would be compensated for by the remaining ovary. The number of ovulated ova was maintained by the remaining ovary in the group that underwent unilateral ovariectomy 2 days after the beginning of vulval bleeding. However, in the groups ovariectomized 5 or 8 days after the beginning of vulval bleeding, no compensation for the number of ova that would have been ovulated from the lost ovary was observed; ova were ovulated only from the follicles 3 mm or greater in diameter observed in the remaining ovary at unilateral ovariectomy. Thus, in dogs, the number of ovulated ova is considered to be determined within 5 days after the beginning of vulval bleeding.

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Section: Introductionmentioning

confidence: 99%

Ovulation Compensatory Function After Unilateral Ovariectomy in Dogs

Tsutsui¹,

Hori

Takahashi

et al. 2012

Reprod Domestic Animals

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“…It is known that the optimal days for mating bitches differ in dogs of one breed (Phemister et al, 1973;Hori et al, 2012;Hahn et al, 2017) and may even "shi" during life, even in the same animal (Grishina & Minjuk, 2016). It is believed that with increasing age of the bitch it should be mated at a later date.…”

Section: Introductionmentioning

confidence: 99%

“…is is oen the most common cause of apparent infertility because mating occurs at the wrong time. Most owners practice mating (insemination) for 10-14 days from the beginning of proestrus, but this does not always give the expected result, as ovulation can occur on 21 and even 27-31 days (England & Concannon, 2002;Niżanski W. 2004;Kustric & Dzhonston, 2005;Bicudo et al, 2010;Derkach, 2011;Hori et al, 2012;Davidenko & Ponomarenko, 2016;Djul'ger & Djul'ger, 2018).…”

Section: Introductionmentioning

confidence: 99%

Determining the optimal insemination time of bitches

2022

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Nowadays, breeding dogs requires a competent, science-based approach. In particular, the choice of the optimal insemination time (both natural and artificial) is one of the important factors of successful mating or artificial insemination of bitches and is crucial in the problem of infertility. The period of fertilization (the time when ovicells can be fertilized) is 2-5 days after ovulation. Therefore, mating should be performed immediately before or during this period. The optimal time can be determied using various methods that estimate the period of fertility (when mating/inseminación can lead to conception). However, none of the diagnostic techniques is absolutely reliable, so for the most accurate result, it is recommended to use several (two or three) studies. For example: counting days, assessment of vulvar and vaginal discharge plus smear and/or vaginoscopy. Control mating increases the probability of conception and is usually performed the day after the first mating. It should be considered that the time of ovulation in the same bitch during different heat can be different. For bitches with problems of conception use the maximum number of methods with the analysis of past successful and unsuccessful matings. Choosing a specific method also implies an economic aspect, such as when owners have to carry bitches for a long distance and they need to be sure of the exact date of ovulation.

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“…The day of ovulation is not linked to estrous cycle duration. The ovulation time occur at 11 days after onset of vulvar bleeding(Hori et al, 2012). In the current work, we could predict ovulation day by using B-Mode ultrasonography and vaginal cytology.…”

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confidence: 96%

Exploring of ovulation timeinbitches by utilizing cytological surveyand doppler ultrasonography

Yousry

Fadel

Sosa

et al. 2022

Benha Veterinary Medical Journal

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There are challenges when monitoring peri-ovulatory ovarian activity in domestic bitches which only ovulate once or twice a year. There is a difficulty to distinguish between preovulatory follicles and/or corpus luteum. As luteinization of follicles subsists before ovulation, follicles do not collapse after ovulation. Thus, the aim of the present study was to predict the exact day of ovulation. Twenty-seven bitches of mixed breeds were examined daily from the onset of proestrus to five days post ovulation by vaginal smear, real-time B-mode and Doppler ultrasonography. Ultrasound was conducted in both standing and lateral recumbency positions using microconvex and linear probes. Vaginal swabs were stained by DIFF QUICK stain. There was high cornification rate (90 %) of vaginal epithelium and substantial increase in follicular size (0.55±0.02 cm) at ovulation day. There was significant increase in ovarian blood perfusion at Day 0 and 1. Maximum coloring seen two days around ovulation time. We concluded that color Doppler ultrasound performed once daily was more accurate in predicting the preovulatory LH peak than B-mode ultrasound and vaginal cytology.

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Ovulation Day After Onset of Vulval Bleeding in a Beagle Colony

Cited by 4 publications

References 7 publications

Ovulation Compensatory Function After Unilateral Ovariectomy in Dogs

Ovulation Compensatory Function After Unilateral Ovariectomy in Dogs

Determining the optimal insemination time of bitches

Exploring of ovulation timeinbitches by utilizing cytological surveyand doppler ultrasonography

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