Abstract
The 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.Keywords: Oestrus, synchronization, fluorogestone acetate, eCG, Red Sokoto goats
Highlights
There is an increasing gap between the growth rate in the global human population and the availability of animal protein, with developing countries being more vulnerable to this gap (Riaz et al, 2012)
Materials and Methods This experiment was conducted at the goat farm of the Small Ruminant Research Programme (SRRP), National Animal Production Research Institute (NAPRI), Ahmadu Bello University, Shika-Zaria, Nigeria, between January and February
Shika-Zaria has an average annual rainfall of 1100 mm, usually lasting from May to October with a mean relative humidity of 72%, while the dry season lasts from November to April with mean daily temperatures ranging from 15 oC to 36 oC and mean relative humidity of between 20% and 37%
Summary
There is an increasing gap between the growth rate in the global human population and the availability of animal protein, with developing countries being more vulnerable to this gap (Riaz et al, 2012). There is a considerable potential for increased goat production and this depends on the recognition of their significance in supplying proteins of high biological value in the forms of meat and milk (Mamabolo & Webb, 2005). Owing to the great potential that goat production signifies, various efforts are being made to apply reproductive biotechnologies, including oestrus synchronization, to maximize meat production. Synchronization of oestrus is an important management tool that has been used to enhance reproduction in goats (Holtz, 2005; Omontese et al, 2010; Riaz et al, 2012).
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