Induced breeding in anestrous milking ewes of dairy breeds: Comparison of norgestomet, medroxyprogesterone and fluorogestone in two regimes of PMSG

Alifakiotis, T.; Michailidis, I.; Gavrilidis, G.

doi:10.1016/0093-691x(82)90058-9

Cited by 24 publications

(6 citation statements)

References 6 publications

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“…This is similar to previous reports by Omontese et al (2010) in sheep, although, some authors have reported lower retention rates (Ainsworth and Downey, 1986). Retention is reported to be influenced by the nature of the progestagen and the experience of the technician applying the devices or sponges (Alifakiotis et al, 1982).…”

Section: ■ Discussionsupporting

confidence: 91%

Effet de l’acide ascorbique sur le taux de fécondation des brebis Yankasa après synchronisation de l’œstrus

Omontese

Adewuyi

Rekwot

et al. 2017

Rev. Elev. Med. Vet. Pays Trop.

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L’objectif de cette étude était d’évaluer les effets d’une administration d’acide ascorbique (AA) sur le taux de fécondation de brebis dont les chaleurs étaient induites par deux traitements à base de progestogènes. Des brebis de race Yankasa (n = 64) ont été réparties de façon égale en deux groupes. Dans l’un, les brebis ont été traitées avec un dispositif intravaginal de libération continue du médicament (CIDR). Dans l’autre, les brebis ont été traitées avec 45 mg d’acétate de fluorogestone (FGA) au moyen d’une éponge vaginale. Après le retrait des progestogènes, les brebis de chaque groupe exprimant des chaleurs ont été réparties en quatre sous-groupes : CIDR témoin (CDNN, n = 12), CIDR plus AA (CDAA, n = 11), FGA témoin (FGNN, n = 13) et FGA plus AA (FGAA, n = 12). La détection des chaleurs a été réalisée au moyen de béliers sexuellement actifs et laissés libres de s’accoupler avec les femelles. Le taux d’expression des chaleurs n’a pas différé entre les sous-groupes. L’intervalle entre le retrait des dispositifs et l’apparition des chaleurs a été significativement (p < 0,05) plus court chez les brebis du groupe FGA que chez celles du groupe CIDR (respectivement 30,35 ± 2,72 et 48,56 ± 7,52 heures). La durée de l’oestrus n’a pas différé (p < 0,05) entre les traitements (FGA 37,22 ± 4,22 et CIDR 39,75 ± 2,51 heures). Les taux de fécondation ont été comparables entre sous-groupes. En conclusion, l’administration d’AA lors du retrait des dispositifs progestogéniques n’a pas amélioré le taux de fécondation des brebis Yankasa.

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Section: ■ Discussionsupporting

confidence: 91%

Effet de l’acide ascorbique sur le taux de fécondation des brebis Yankasa après synchronisation de l’œstrus

Omontese

Adewuyi

Rekwot

et al. 2017

Rev. Elev. Med. Vet. Pays Trop.

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“…This may be the case when ewes are not induced to cycle during anoestrus. However, when hormonally treated, several studies reported successful induction of oestrus in lactating ewes (Alifakiotis et al, 1982;Laliotis et al, 1998;Abdullah et al, 2002) using progestagen and eCG.…”

Section: Discussionmentioning

confidence: 99%

The effect of breed type and lactation status on reproductive performance in

Kridli¹,

Abdullah²,

Husein³

2010

SA J. An. Sci.

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This study was conducted to evaluate the effect of breed types and lactation status on reproductive performance of hormonally-treated Awassi ewes. A total of 282 ewes were treated with intravaginal progestagen sponges and equine chorionic gonadotropin. Ewes were mated with fertile rams following sponge removal. Lambing rate was similar between brown-and black-faced ewes, while the percentage of multiple births, fecundity and prolificacy were greater in black-faced ewes. Lambing rate and the percentage of multiple births were similar between lactating and dry ewes. Fecundity tended to be greater in lactating ewes, while prolificacy was similar regardless of lactation status. Results of the present study indicate that black-faced Awassi ewes respond better to hormonal treatment than brown-faced ewes while the lactation status does not appear to influence the ewes' response to hormonal treatment. ________________________________________________________________________________

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“…Romano (1996) observed 100% retention in dairy goats treated with FGA throughout the period of his experiment. Factors such as intravaginal sponge texture and consistency (Alifakiotis et al, 1982), length of vaginal tract (Omontese et al, unpublished observations) and techniques employed in inserting the sponge (Romano, 1998) could influence sponge retention in the vagina.…”

Section: Resultsmentioning

confidence: 99%

Oestrus induction using fluorogestone acetate sponges and equine chorionic gonadotrophin in Red Sokoto goats

Omontese¹,

Rekwot²,

Makun³

et al. 2013

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe objective of this study was to evaluate the effect of a progestagen treatment (fluorogestone acetate sponge) alone or in combination with equine chorionic gonadotrophin (eCG) on oestrus response in Red Sokoto (RS) goats. One hundred RS does were treated with 30 mg fluorogestone acetate (FGA) sponges for 14 days. At the end of the progestagen treatment, does that retained the sponges were allocated to two groups; FGAeCG and FGA. The FGAeCG group (n = 28) received 200 IU eCG i.m. concurrently with the sponge removal, while the FGA group (n = 28) did not receive eCG at sponge removal. Oestrus was detected twice daily (at 07:00 -10:00 and 15:00 -18:00) using sexually active bucks for five days following progestagen withdrawal. There was no significant difference in oestrus response between groups FGAeCG (82.1%) and FGA (78.6%). There was a significant difference in the time to the onset (29.3 ± 4.6 and 44.2 ± 6.3 h for the FGAeCG and FGA, respectively) and duration of the induced oestrus period (38.9 ± 5.1 and 22.7 ± 4.6 h for the FGAeCG and FGA groups, respectively). It is concluded that although both groups showed good oestrus synchronization rates, administration of eCG shortened the time to onset of oestrus and increased the duration of oestrus in Red Sokoto does. ________________________________________________________________________________

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Induced breeding in anestrous milking ewes of dairy breeds: Comparison of norgestomet, medroxyprogesterone and fluorogestone in two regimes of PMSG

Cited by 24 publications

References 6 publications

Effet de l’acide ascorbique sur le taux de fécondation des brebis Yankasa après synchronisation de l’œstrus

Effet de l’acide ascorbique sur le taux de fécondation des brebis Yankasa après synchronisation de l’œstrus

The effect of breed type and lactation status on reproductive performance in

Oestrus induction using fluorogestone acetate sponges and equine chorionic gonadotrophin in Red Sokoto goats

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