Effect on oestrus and ovulation of exposing creole goats to the male at three times of the year

Chemineau, Philippe

doi:10.1530/jrf.0.0670065

Cited by 129 publications

(86 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The progesterone profiles revealed an oestrous cycle length similar to the cycle length of the domestic goat [22]. Our results revealed a high proportion of females with short cycles, which seems to be a characteristic of the caprine species and breeds [23][24][25], as well as females showing only one cycle of variable duration. It is unknown if these findings are usual in the wild.…”

Section: Discussionsupporting

confidence: 58%

Seasonal ovulatory activity and plasma prolactin concentrations in the Spanish ibex(Capra pyrenaica hispanica) maintained in captivity

Santiago-Moreno¹,

Gómez-Brunet²,

González-Bulnes³

et al. 2003

Reprod. Nutr. Dev.

View full text Add to dashboard Cite

-Seasonal changes in ovulatory activity, assessed by the measurement of plasma progesterone and plasma prolactin concentrations were monitored in 10 Spanish ibex females captured in the National Wildlife Reserve of Sierra Nevada (South Spain, 37º N). Five of the 10 female ibex showed ovulatory activity with a mean (± s.e.m.) duration of the oestrous cycle of 19.4 ± 1 days (range: 17-23 days). On average, the five cyclic females weighed 28 ± 0.9 kg. Progesterone cycles occurred only in animals older than 4 years of age. Ovulatory activity extended from December to January. The duration of the breeding season was 43.2 ± 7.7 days. Ibex females younger than 4 years of age had a body weight lower (P < 0.01) than that of adults and none of them displayed ovulations. Plasma concentrations of prolactin levels were significantly affected by season (P < 0.05), following a trend that was roughly parallel to daylength. The highest values occurred in the spring (119.7 ± 21.4 ng·mL -1 ) and the summer (139.3 ± 19.8 ng·mL -1 ), the lowest values in the autumn (26 ± 7.4 ng·mL -1 ) and in the winter (19.7 ± 3.2 ng·mL -1 ). Our results showed a very restricted breeding season, despite the fact that the Spanish ibex originates from and lives in a temperate latitude, revealing a remarkably good adaptation to the harsh climatic and nutritional conditions of their mountainous habitat.breeding season / ovulation / progesterone

show abstract

Section: Discussionsupporting

confidence: 58%

Seasonal ovulatory activity and plasma prolactin concentrations in the Spanish ibex(Capra pyrenaica hispanica) maintained in captivity

Santiago-Moreno¹,

Gómez-Brunet²,

González-Bulnes³

et al. 2003

Reprod. Nutr. Dev.

View full text Add to dashboard Cite

show abstract

“…breeds [3], but similar to goats [17,18], estrous behavior can be expressed without a previous luteal phase of normal duration.…”

Section: Discussionmentioning

confidence: 99%

Reproductive performance of Lacaune dairy sheep exposed to artificial long days followed by natural photoperiod without and with additional progestagen treatment during the nonbreeding season

et al. 2015

View full text Add to dashboard Cite

This study compared the reproductive performance of Lacaune dairy ewes exposed to a light program and subsequent male introduction without (n = 36) or with (n = 36) an additional 6-day progestagen treatment during the nonbreeding season. All ewes were exposed to extended day length (16 hours light and 8 hours darkness) for 77 days during winter (December 15 until March 2) followed by increasing natural photoperiod. At the end of the photoperiodic treatment, three blood samples were collected 6 days apart for progesterone (P4) analysis to determine cyclic activity. One half of the ewes were additionally subjected to a 6-day progestagen treatment in combination with PGF2 and eCG at insert withdrawal. Rams fitted with marking harnesses were introduced to females for 45 days and marked ewes recorded. Ewes exposed to the light program only were joined 40 days after the end of photoperiodic treatment, and ewes with additional progestagen treatment were joined 1 day after insert removal (40-44 days after the end of photostimulation). Lambing data were recorded and fertility (percentage of ewes lambing, lambing rate, and litter size) assessed to the first service period and overall. Mean serum P4 concentrations were similarly (P > 0.05) low in both groups (0.4-0.7 ng/mL vs. 0.4-0.6 ng/mL). On the basis of elevated P4 levels (>1 ng/mL), evidence of luteal activity was found in 27.8% of the ewes at the end of the light program. Estrus response was equally high (97.2%) and estrus distribution highly synchronized in progestagen-treated ewes (91.7% within 4 days). In ewes exposed to the light program only, estrous activity was recorded within 4 days (six ewes), from Day 8 to Day 17 (17 ewes) and from Day 19 to Day 25 (12 ewes) after joining. The percentage of ewes that lambed to the first service period was higher (P < 0.05) in ewes exposed to the light program only than that in the group additionally treated with progestagen/PGF2 /eCG (94.4% vs. 69.4%). Overall, the percentage of lambing ewes was similar in both groups (97.2% and 94.4%), and lambing rates (1.4-1.9) and litter sizes (1.9-2.1) were high and not influenced (P > 0.05) by the treatment. In conclusion, this study reports that exposition of Lacaune ewes to artificial long days followed by natural day length and male introduction is highly effective to induce fertile estrous activity during the nonbreeding season and offers a reliable and practical alternative to hormonal manipulation for out-of-season breeding in sheep. a b s t r a c tThis study compared the reproductive performance of Lacaune dairy ewes exposed to a light program and subsequent male introduction without (n ¼ 36) or with (n ¼ 36) an additional 6-day progestagen treatment during the nonbreeding season. All ewes were exposed to extended day length (16 hours light and 8 hours darkness) for 77 days during winter (December 15 until March 2) followed by increasing natural photoperiod. At the end of the photoperiodic treatment, three blood samples were collected 6 days apart for progesterone (...

show abstract

“…A significant negative relationship was observed between the percentage of females cycling before male introduction and the percentage of females experiencing a short male-induced cycle in both species (ewes [11], goats [12]). The frequency of short cycles is significantly higher in Barbarine ewes which have been underfed around lambing, 5 months before introduction of rams, than in females correctly fed (67 vs. 21 %, 13).…”

Section: Figurementioning

confidence: 99%

“…This explains the difference between species when watching at the time schedule of distribution of oestrus after introduction of males. The expression of oestrous behaviour also varies with anoestrous intensity, especially in goats: in deep anoestrus, fewer females experience oestrus at the first ovulation [12].…”

Section: Figurementioning

confidence: 99%

Male-induced short oestrous and ovarian cycles in sheep and goats: a working hypothesis

et al. 2006

View full text Add to dashboard Cite

-The existence of short ovulatory cycles (5-day duration) after the first male-induced ovulations in anovulatory ewes and goats, associated or not with the appearance of oestrous behaviour, is the origin of the two-peak abnormal distribution of parturitions after the "male effect". We propose here a working hypothesis to explain the presence of these short cycles. The male-effect is efficient during anoestrus, when follicles contain granulosa cells of lower quality than during the breeding season. They generate corpora lutea (CL) with a lower proportion of large luteal cells compared to small cells, which secrete less progesterone, compared to what is observed in the breeding season cycle. This is probably not sufficient to block prostaglandin synthesis in the endometrial cells of the uterus at the time when the responsiveness to prostaglandins of the new-formed CL is initiated and, in parallel, to centrally reduce LH pulsatility. This LH pulsatility stimulates a new wave of follicles secreting oestradiol which, in turn, stimulates prostaglandin synthesis and provokes luteolysis and new ovulation(s). The occurrence of a new follicular wave on days 3-4 of the first male-induced cycle and the initiation of the responsiveness to prostaglandins of the CL from day 3 of the oestrous cycle are probably the key elements which ensure such regularity in the duration of the short cycles. Exogenous progesterone injection suppresses short cycles, probably not by delaying ovulation time, but rather by blocking prostaglandin synthesis, thus impairing luteolysis. The existence, or not, of oestrous behaviour associated to these ovulatory events mainly varies with species: ewes, compared to does, require a more intense endogenous progesterone priming; only ovulations preceded by normal cycles are associated with oestrous behaviour. Thus, the precise and delicate mechanism underlying the existence of short ovulatory and oestrous cycles induced by the male effect appears to be dependent on the various levels of the hypothalamo-pituitary-ovario-uterine axis.male-effect / ovulation / corpus luteum / cycle / oestrus / uterus

show abstract

Effect on oestrus and ovulation of exposing creole goats to the male at three times of the year

Cited by 129 publications

References 8 publications

Seasonal ovulatory activity and plasma prolactin concentrations in the Spanish ibex(Capra pyrenaica hispanica) maintained in captivity

Seasonal ovulatory activity and plasma prolactin concentrations in the Spanish ibex(Capra pyrenaica hispanica) maintained in captivity

Reproductive performance of Lacaune dairy sheep exposed to artificial long days followed by natural photoperiod without and with additional progestagen treatment during the nonbreeding season

Male-induced short oestrous and ovarian cycles in sheep and goats: a working hypothesis

Contact Info

Product

Resources

About