Abstract
The objective of this study was to evaluate the duration of four progestagen treatments on estrous synchronization and pregnancy rate in non-lactating Anatolian black goats during the natural breeding season. All does were divided into four groups according to progestagen treatment duration using intravaginal sponges (60 mg MAP): group 1, 13 days (n = 23), group 2, 11 days (n = 25), group 3, 9 days (n = 25) and group 4, 6 days (n = 25). In addition, 24 h before sponges removal, each doe was injected with 0.075 mg of cloprostenol (PGF2α) and 500 IU eCG. The goats within the same group were naturally mated at fixed time 40 h following progestagen removal, using the same breed fertile bucks (1:5 mating ratio). The total estrous response for the first 12 h, total estrous response within 60 h, time to onset of the induced estrus, duration of the induced estrus and pregnancy rate were 3.0, 96.9%, 26.5 ± 0.7 h, 22.6 ± 0.8 h and 92.0%, respectively. In terms of the onset of induced estrus there were significant differences between group 1 and groups 3 and 4 and between group 2 and group 3 (P < 0.05). The protocols used were equally efficient in synchronizing and inducing estrus in non-lactating Anatolian black does during the natural breeding season. Conclude on pregnancy rate. In addition, pregnancy rates were similar results.
Highlights
Most breeds of goats show seasonality in reproduction activities, due to season changes, latitude/longitude, the length of the photoperiod and other factors (Amoah et al, 1996; Simões, 2015)
Intravaginal sponges impregnated with different progestagens, mainly medroxyprogesterone acetate (MAP) and fluorogestone acetate (FGA) are the most appropriate hormonal techniques used for controlled breeding in goats (Wildeus, 2000)
The most common treatments for estrous synchronization in goats, regardless of stage of the cycle or follicular status of the ovary at the time of treatment or season, are based on long progestagen exposure (11 or 21 days) associated with an intramuscular (i.m.) injection of equine chorionic gonadotrophin (eCG) alone or eCG with prostaglandin F2α (PGF2α) given at the end of the treatment (Corteel et al, 1988; Gordon, 1999)
Summary
Most breeds of goats show seasonality in reproduction activities, due to season changes, latitude/longitude, the length of the photoperiod and other factors (Amoah et al, 1996; Simões, 2015). Various protocols have been developed to control reproduction activities throughout the year including the buck effect, photoperiod treatments and the use of exogenous hormone treatment (Whitley and Jackson, 2004; LopezSebastián et al, 2014) Exogenous hormones such as progesterone or its synthetic analogues, equine chorionic gonadotrophin (eCG) and prostaglandin F2α (PGF2α) are generally used in the reproductive season of goats (Dogan et al, 2005), outside the natural breeding season (Corteel et al, 1988; Souza et al, 2011; Pietroski et al, 2013) and in the transition period (Dogan et al, 2004, 2008a, b). The objective of this study was to evaluate different progestagen treatment duration on estrous synchronization and pregnancy rate in non-lactating Anatolian black goats during the natural breeding season
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