Progesterone and behavioral features when estrous is induced in Alpine goats

Abstract

The objective of the present study was to evaluate the endocrine and behavioral features of estrous-induced Alpine goats. A total of 36 nulliparous, 40 non-lactating and 42 lactating does were treated with intravaginal 60 mg medroxyprogesterone acetate sponges for 9 d plus 200 IU eCG and 22.5 microg d-cloprostenol 24 h before sponge removal. Plasma progesterone concentration was analyzed from blood sampled on days 0 (sponge insertion), 5, 8 (cloprostenol administration) and 9 (sponge removal) in 11 nulliparous, 13 non-lactating and 11 lactating does. Estrous response did not differ (P>0.05) among nulliparous (97.2%), non-lactating (90.00%) and lactating does (85.7%). Interval to estrus and duration of estrus did not differ (P>0.05) among nulliparous (22.8+/-9.9 and 25.6+/-6.8h), non-lactating (23.7+/-15.8 and 25.0+/-6.0 h) and lactating does (22.2+/-10.4 and 24.9+/-4.2h). The accumulative percentage of does in estrus during the first 36 h after sponge removal was 88.1%. The correlation between interval to estrus and duration of estrus was r=-0.32 (P<0.001). Endogenous progesterone production is decreased until day 8 or suppressed by MAP on day 9. Conception rate was greater (P<0.01) in lactating (77.8%) than non-lactating (44.4%) but similar (P>0.05) to nulliparous (60.0%) goats. Estrus can be efficiently induced by means of hormonal treatment in goats and acceptable fertility can be obtained regardless of animal category.

Estrus Response and Conception Rate in Sangamneri and Osmanabadi Goat Does using different Estrus Synchronization Protocols

“…eCG protocol was employed. The mean percentage of goats exhibiting estrus when treated with progestagen + PGF 2 α + eCG in the present study corroborate with the findings of earlier workers (Freitas et al, 1996 a ; Leboeuf et al, 2003;Karaca et al, 2010;and Nogueira et al, 2011) and was higher when compared with the findings of Drion et al, 2001 (87 %), Fonseca et al, 2005 (86.8%), Fonseca et al, (2008) (88.1%) in goats. Around 80 % estrus behavior was observed in Damascus Baladi goats in studies of Telab and Ashmawy (2007) when GnRH was administered 24 h before sponge removal.…”

“…There was significant variation (P< 0.05) in the duration of onset of estrus between Sangamneri and Osmanabadi goats in Group II (46.51 vs 24.00 h). Whereas durations of onset of estrus were non-significant (P > 0.05) between two breeds in Groups I, III, IV and V. Similar observations when treatment of progestagen + PGF 2 α + eCG was employed in goats regarding the time for the interval from sponge removal to onset of estrus in goats have been reported by Freitas et al (1996 a ), Drion et al (2001), Leboeuf et al (2003), Fonseca et al (2008), Karaca et al (2010). Higher range of interval of onset of estrus from the time of sponge withdrawal in goats has been reported by Feritas et al (1996 b ), 32 ± 7.1 h; Kusina et al (1999), 11 to 96 h; Lymberopoulos et al (2002), 42 to 44 h; Dogan et al (2005), 12 -66 h; and Fonseca et al (2005), 49.7±15.7 h in synchronized goats.…”

Estrous and ovulatory responses following cervical artificial insemination in Thai-native goats given a new or once-used controlled internal drug release with human chorionic gonadotropin

“…Longer duration of estrus in dairy and meat goats was reported in some studies (Greyling and van der Nest 2000;Romano 2004). Although duration of estrus for the once-used CIDR was significantly shorter (21.4 ±1.4 h) compared to the new CIDR (26.1±1.1 h), it was still in a normal range of time (Baril and Vallet 1990;Fonseca et al 2008). Behavioral duration of estrus is also influenced by breed and steroid hormone concentrations (Medan et al 2003;Noguchi et al 2010).…”

Effectiveness of controlled internal drug release device treatment to alleviate reproductive seasonality in anestrus lactating or dry Barki and Rahmani ewes during non‐breeding season

“…On the other hand, oestrous rate did not differ between dry and lactating ewes. In addition, interval to oestrus and duration of oestrus did not differ between lactating and non-lactating ewes (Table 3) as reported in goats (Fonseca et al, 2008).…”