Authors
Abstract
ABSTRACT: The effect of the so-called Short-Term Protocol (6 to 9 day progesterone treatment + eCG) on oestrous, progesterone plasma concentration and fertility was studied in goats (SRD). Females were subjected to estrous synchronization protocols with a re-use of intravaginal progesterone devices (CIDR) with 0.3 g of progesterone. The goats were randomly in three treatments (n=9/group); T1 (CIDR - 6d), T2 (CIDR - 9d) and T3 (CIDR - 13d). At dispositive withdrawal was administrated 500 UI intramuscular injection of eCG (equine chorionic gonadotropine). Blood samples by jugular venopunture for progesterone (P4 ) plasma concentration determination were collected in four moments: collect 1 (CIDR insert); collect 2 (CIDR withdrawal); collect 3 (estrous day) and collect 4 (at day 21 after natural service). The variables were evaluated with the variance analysis under GLM procedures of statistical package SAS. Goats were checked for oestrous. The onset of the synchronized estrous after removal CIDR did not show differences (P>0.05) and the interval were longer in T1 (94.74±82,60 h) than T2(55.19±28.27 h) and T3(52.89±29.66 h). No significant differences were observed in pregnancy rate (number pregnant goats/number goats treated) with results of 66.67; 44.44 and 44.44% for T1, T2 and T3, respectively. In summary, the results of this study show that the re-use of the devices, associated with the short-term protocol for 6 or 9 days is possible in goats (SRD) in tropical environment conditions of Colombia.
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References
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