科研之友
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摘要
Compared to cattle and sheep, few studies had been undertaken to evaluate the incidence of embryonic and fetal losses (EFL) in goats. The objectives of the present study were to characterize the timing of EFL and to identify the factors that are associated with EFL in goats such as breed, age, parity, method of estrous synchronization, and breeding. Moreover, this study aimed to ensure whether a relationship existed between serum progesterone (P4) and EFL Goats (n = 151) of different breeds (70 Zaraiebi, 42 Damascus, and 39 Cross goats [Baladi x Damascus]) were evaluated by ultrasonography to monitor EFL during different stages of gestation (020-23, 026-29, D33-36, D40-45, and 047-54 after breeding). Blood samples were collected at 07, D20, and at each ultrasonographic scanning to clarify changes of serum P4 levels concurrently with EFL Results revealed that 45 of 109 goats (41.28%) were exposed to EFL A higher EFL % was observed between 020 to 23 and D47 to 54 (19.61%) compared with 047 to 54 to birth (11.76%). Moreover, a higher EFL % was observed in Zaraiebi goats compared with others. Age and goat parity had no significant effect on the EFL % in all goats. A high EFL % were observed in goats synchronized by P4 sponge, as well as artificially inseminated goats compared with goats with spontaneous estrus, and bred by natural mating, respectively. Serum P4 at D7 or D20 after breeding showed nonsignificant difference between normal pregnant goats and goats that experienced EFL Unlike goats that experienced partial EFL, goats that experienced total EFL between D20 to 23 and 026 to 29 showed an abrupt P4 reduction (85.06%; P < 0.01) suggesting the probability of endocrine disruption of the CL However, goats that were exposed to total EFL between 026 and 29 to 033 to 36 showed a low P4 reduction (24.90%; P < 0.05), which might be considered as an effect rather than a cause of EFL In conclusion, different factors such as breed, estrous synchronization, breeding, and stage of pregnancy may be involved in EFL in goats. Therefore, improvement of the goat management in the early stage of pregnancy is important to decrease EFL% in goats. Although the P4 did not show any significant difference between normal pregnancy goats and goats that experienced EFL, CL disruption should be taken into the consideration, at least, in goats exposed to total embryonic losses.
- 出版日期2016-1-15
