Seasonality of estrus and ovulation in Creole goats of Argentina

Rivera, Gonzalo; Alanis, Graciela Ángela; Chaves, M.A.; Ferrero, Susana; Morello, Héctor

doi:10.1016/s0921-4488(02)00236-5

Cited by 35 publications

(23 citation statements)

References 18 publications

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“…To test whether the photoperiod was the factor responsible for the annual reproductive rhythm observed in our subtropical female goats, ovarian activity was determined in does exposed to the same experimental conditions described above in males. As expected, the control group displayed large seasonal variations in their ovulatory activity, which lasted from September to February, as in other subtropical and temperate breeds of sheep and goats Restall, 1992;Rivera et al, 2003). The experimental group also displayed changes in their ovulatory activity, but the timing of these changes was profoundly modified by photoperiodic treatment.…”

Section: Female Goatssupporting

confidence: 73%

“…In female goats from the subtropical latitudes of Australia and Argentina, estrous behavior and ovarian activity start in autumn and finish in winter (Restall, 1992;Rivera et al, 2003). In contrast, local goats from Chile show only 3 months of anestrus in late spring and early summer (Santa Maria et al, 1990), while Boer goats in South Africa display estrous activity all year round, with the highest percentage of estrus in autumn (Greyling, 2000).…”

Section: Female Goatsmentioning

confidence: 99%

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Environmental and social cues can be used in combination to develop sustainable breeding techniques for goat reproduction in the subtropics

2011

Animal

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Goat breeds from subtropical latitudes show different annual reproductive cycles. Some of them display large seasonal variations in their annual breeding season, while others display a moderate seasonality or sexual activity all year round. This reproductive seasonality causes seasonality of milk, cheese and meat productions and, as a consequence, induces wide variation in producer incomes. To solve this problem and provide methods allowing producers to breed animals during the anestrous period and stabilize production all year round, it is necessary to have a deep knowledge of their annual sexual activity and to identify the environmental factors controlling the timing of the annual reproductive cycle. Then, it is possible to build on these knowledge sustainable breeding techniques adapted to the environmental, economic and social characteristics of the local breeding system. In this review, I will illustrate this strategy through the example of our experiments in subtropical goats. First, we determined the characteristics of the annual breeding season in both male and female goats. Second, we identified the photoperiod as the major environmental factor controlling the timing of this annual breeding season. Third, we used the photoperiod to stimulate indirectly the sexual behavior of does. Indeed, we used photoperiodic treatments to stimulate the sexual activity of bucks during the non-breeding season. These sexually active male goats were then used to induce and synchronize the estrous behavior and ovulatory activity of anestrous females in confined or grazing conditions by using the 'male effect'. Under subtropical conditions, these results constitute an original manner to control the reproductive activity of local goats using the photoperiod combined with the 'male effect.'

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Section: Female Goatssupporting

confidence: 73%

Section: Female Goatsmentioning

confidence: 99%

Environmental and social cues can be used in combination to develop sustainable breeding techniques for goat reproduction in the subtropics

2011

Animal

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“…Ces évènements ont été plus fréquents au début ou à la fin de la saison d'activité sexuelle. Ces résultats sont similaires à ceux trouvés sur d'autres races caprines (7,21). En début de la saison sexuelle, les comportements d'oestrus observés sans ovulations préalables montrent encore une fois la différence entre la brebis et la chèvre.…”

Section: ■ Discussionunclassified

Variations saisonnières de l’oestrus et de l’ovulation chez la chèvre locale Maure en Tunisie

Lassoued¹,

Rekik

2005

Rev. Elev. Med. Vet. Pays Trop.

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Un total de 22 chèvres Maures tunisiennes ont permis de caractériser les variations saisonnières des activités d’oestrus et d’ovulation sur une période de 14 mois. Durant la période expérimentale, les chèvres ont été maintenues non gravides. Elles ont été conduites sur des parcours naturels et ont reçu un apport constant en concentré de 200 g par chèvre et par jour. En outre, elles ont été exposées à une photopériode naturelle et maintenues en présence continue des boucs. Des boucs munis de tabliers ont été utilisés pour la détection biquotidienne du comportement d’oestrus, alors que l’examen de l’activité ovarienne a été réalisé par des endoscopies mensuelles. Au cours de la saison sexuelle, qui s’est étendue de septembre à mars, 80 p. 100 des chèvres ont montré un comportement d’oestrus au moins une fois et 53 p. 100 de la totalité des cycles oestriens ont été accompagnés d’ovulation. Cette saison a précédé une période d’inactivité sexuelle de mars à août. L’incidence des cycles oestriens anormaux de courte durée a été plus élevée vers la fin de la saison sexuelle. Pendant le mois de septembre, 86 p. 100 des chèvres ont montré un comportement d’oestrus. La même distribution saisonnière a été aussi observée pour l’activité cyclique ovarienne. La proportion de femelles ovulant pendant la saison sexuelle a augmenté progressivement à partir du mois de septembre pour atteindre un maximum de 100 p. 100 en décembre et a commencé ensuite à baisser pour atteindre un minimum de 14 p. 100 au mois de mars. La valeur moyenne du taux d’ovulation a été de 1,51 ± 0,29, atteignant un maximum de 1,94 ± 0,74 au début de la saison sexuelle en septembre et un minimum de 1,25 ± 0,50 à la fin de cette saison, au mois de mars. Le taux d’ovulation a été nul entre les mois d’avril et d’août inclus. L’écart entre le début et la fin de la saison sexuelle a été significativement différent (P < 0,05). En conclusion, les chèvres locales en Tunisie, sous un milieu semi-aride, ont un rythme reproductif saisonnier.

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“…Most breeds of sheep and goats from temperate latitudes and some either from or adapted to subtropical latitudes exhibit seasonal variations of sexual activity (Chemineau et al, 1992a;Delgadillo et al, 1999;Rivera et al, 2003). The timing of reproductive seasonality in these small ruminants, as well as in most mammals, is controlled by photoperiod (Chemineau et al, 1992b).…”

Section: Introductionmentioning

confidence: 99%

Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females

Zarazaga

Gatica

Celi

et al. 2011

Animal

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One experiment was conducted to determine whether the treatment with artificial long days and exogenous melatonin can induce reproductive activity during spring (seasonal anoestrus) in Mediterranean goats that are in daily contact with bucks and whether this treatment causes a variation in the reactivation of the reproductive activity in the normal breeding season. The experiment started on 4 November 2005 and finished on 27 October 2006. Thirty-four adult and barren does were used, distributed into two groups balanced according to their live weight (LW) and body condition score (BCS). Seventeen females were exposed to long days (16 h of light/day) from 14 November 2005 to 20 February 2006. On 20 February, they received one s.c. melatonin implant (LD-M group) and were exposed to natural photoperiodic changes in an open shed. The other females during the experiment were placed in an open shed under natural photoperiod and remained as the control group (C group). The C and LD-M groups were keeping in contact with males during the whole experiment. During the experiment, the LW, BCS and plasma progesterone concentrations were measured weekly, oestrous activity was tested daily using entire aproned bucks, and ovulation rate was evaluated by laparoscopy 7 days after positive identification of the oestrus. A clear treatment–time interaction was observed for plasma progesterone concentrations ( P,0.001), with a period of high progesterone concentrations during the natural seasonal anoestrus in the LD-M group. Although 94.1% of females in the LD-M group presented ovarian activity during this period, no female in group C did. Resumption of ovarian activity in the subsequent natural breeding season was 2 weeks later in the LD-M group in comparison with group C ( P,0.05). We can conclude that in Mediterranean goat breeding systems, when females are in daily contact with bucks, the treatment with 3 months of long days and melatonin implant at the end of the light photoperiodic treatment can induce ovarian and oestrous activity during the seasonal anoestrus. Finally, this treatment causes a short delay in the subsequent reactivation of ovarian activity in the natural breeding season

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Seasonality of estrus and ovulation in Creole goats of Argentina

Cited by 35 publications

References 18 publications

Environmental and social cues can be used in combination to develop sustainable breeding techniques for goat reproduction in the subtropics

Environmental and social cues can be used in combination to develop sustainable breeding techniques for goat reproduction in the subtropics

Variations saisonnières de l’oestrus et de l’ovulation chez la chèvre locale Maure en Tunisie

Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females

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