Serum LH peak and ovulation following synchronized estrus in goats

Martínez-Álvarez, Laura; Hernández-Cerón, Joel; González-Padilla, Everardo; Perera-Marín, Gerardo; Valencia, Javier

doi:10.1016/j.smallrumres.2005.12.024

Cited by 20 publications

(12 citation statements)

References 18 publications

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“…In both studies, no differences were found between induced and natural oestrus regarding the onset of oestrus to LH peak interval. However, other authors reported different values for this interval: 14.9 6 1.8 h (Martínez-Á lvarez et al, 2007), 10.0 6 3.5 h (Greyling and Van Niekerk, 1990) or 6.8 6 1.0 h (Pierson et al, 2001), without differences between breeding periods. Freitas et al (1997b) suggested that this interval could be influenced by the protocol of oestrus synchronization.…”

Section: Discussionmentioning

confidence: 74%

Time of ovulation in nulliparous and multiparous goats

Simões

Baril

Almeida

et al. 2008

Animal

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Fifteen nulliparous and nine multiparous Serrana goats were used, through two successive oestrous cycles, in order to characterize their ovulation time with regard to the number of ovulations after induced and natural oestrus during the breeding season. The onset of oestrus was detected by the amount of vasectomized bucks after oestrus synchronization with prostaglandin, given 10 days apart, and in the following two expected natural oestrus. The preovulatory LH peak was determined from blood samples collected 0, 4, 8, 12, 16, 20 and 24 h after onset of oestrus. A transrectal ovarian ultrasound scanning was performed 20, 24, 28, 32, 36, 40, 44 and 60 h after onset of oestrus, for the detection of ovulations by means of the disappearance of large follicles (.4 to 5 mm). Single ovulations were observed in 76% of oestrous periods in nulliparous goats and in 18% of nulliparous goats. The onset of oestrus to LH peak interval was lower in nulliparous (12.1 6 0.9 h, n 5 38) than in multiparous (15.6 6 1.0 h, n 5 22, P , 0.05) goats with no oestrus interaction effects (P . 0.05). The LH peak to first ovulation interval was higher after natural (18.9 6 0.7 h, n 5 36) than after induced (15.8 6 1.2 h, n 5 24, P , 0.05) oestrus. The onset of oestrus to total ovulation interval was influenced by parity (P , 0.01) and oestrus type (P , 0.05) with a length of 30.1 6 1.1 h (n 5 15) and 33.4 6 1.5 h (n 5 9) for induced oestrus of nulliparous and multiparous goats, respectively, and 32.5 6 1.0 h (n 5 23) and 36.5 6 1.1 h (n 5 13) for natural oestrus of nulliparous and multiparous goats, respectively. The onset of oestrus to first ovulation interval was not influenced by parity, but an interval of 8.0 6 1.6 h was observed between the first and second ovulations in polyovulatory oestrus. Consequently, nulliparous goats that are predominantly monovular ovulate earlier than multiparous goats that are predominantly polyovulatory. In conclusion, significant differences occurred in the number and time of ovulations between nulliparous and multiparous goats. More research is necessary for a deeper understanding of the mechanisms regulating monovularory and polyovulatory oestrous cycles regarding the parity of goats.

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Section: Discussionmentioning

confidence: 74%

Time of ovulation in nulliparous and multiparous goats

Simões

Baril

Almeida

et al. 2008

Animal

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“…Estrus was synchronized with intravaginal sponges impregnated with 40 mg of fluorogestone acetate (FGA; Chrono-Gest, Intervet, Mexico) for 11 d and a prostaglandin injection (Prosolvin-C, Intervet, Mexico) 2 d before sponge removal. From previous work with the same animals it was assumed that estrus occurred 44 h after sponge removal (Martinez-Alvarez et al, 2007), at which time daily ultrasonographic observations were performed to corroborate the occurrence of ovulation. The vaginal sponges had been inserted and removed at different days in such a way that when exposure to sexually active bucks was initiated the goats were either on d15 (Group A), d10 (Group B) or d5 (Group C) of the estrous cycle.…”

Section: Methodsmentioning

confidence: 99%

Exposure to the Male does not Exert a Luteolytic Effect in Cyclic Goats

Valencia

Arroyo

Trujillo

et al. 2010

Journal of Applied Animal Research

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“…Because of the use of PFG2α in the synchronization of estrus within the reproductive season, up to 70% of estrus goats have been obtained. These results are lower than those reported when using different devices with progesterone source [21]. On the other hand, in temperate and subtropical regions, the use of the male effect is a tool that is increasingly being used to avoid using hormones, with a 60% effectiveness in the presence of estrus and ovulation in the first 5 days after the introduction of males.…”

Section: Prostaglandin-based Synchronizationmentioning

confidence: 69%

Reproduction in Goats

Sánchez-Dávila¹,

González²,

Barragán³

2018

Goat Science

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Reproductive activity of the goat begins when the females reach puberty, which happens at 5 months of age. The ovarian or estrous cycle is the period between two consecutive estrus. It is also the time that lasts the development of the follicle in the ovary, until rupture occurs and ovulation takes place, which coincides with the appearance of estrus. This chapter will describe the physiological and endocrinological bases of estrus in the goat. Likewise, factors affecting the presence of estrus and ovulation will be described. At another point, synchronization of estrus and ovulation, factors affecting the presence of estrus and external symptoms of estrus, will be described.To achieve synchronization of estrus or induction of ovulation within or outside the breeding season, it may be necessary to manage light hours, male effect, and/or use of hormones. The importance of artificial insemination is described, as well as the current situation of this technique worldwide. Currently, the techniques of artificial insemination in goats have been limited worldwide, due to the lack of resources of producers and trained technicians. The techniques of artificial insemination with estrous synchronization programs and ovulation with current research results will be described.

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Serum LH peak and ovulation following synchronized estrus in goats

Cited by 20 publications

References 18 publications

Time of ovulation in nulliparous and multiparous goats

Time of ovulation in nulliparous and multiparous goats

Exposure to the Male does not Exert a Luteolytic Effect in Cyclic Goats

Reproduction in Goats

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