A comparative study on the fertility after administration of two types of progestogens for estrus synchronization in sheep
Nikola Metodiev, Todor Tsonev, Georgi Anev, Yordan Yordanov
Abstract: The aim of the present study was to compare the effect of the administration of two types of progestagens (FGA or MPA), on fertility using protocols of different durations. Two experiments were conducted with a total of 69 multiparous ewes. Experiment 1. was conducted with 46 ewes aged 2-5 years
from the North-Eastern Bulgarian thin fleece breed - Shumenski type. Four experimental groups were formed depending on the progestagen source and the time of the timed artificial insemination, after removing the vaginal sponges (FGA /48; FGA/42; MPA/48; MPA/42). The sponges stay for all groups was 12 days. At the time of removal of the sponges, 500 IU of PMSG was injected. Experiment 2. was conducted with 23 ewes aged 2-5 years from Synthetic population Bulgarian milk. Two experimental groups were formed depending on the progestagen source: MPA / FGA.The stay of sponges for all groups was 5 days. At the time of sponge removal, 400 IU of PMSG was injected.No significant differences were found in the values of the fertility results in the experimental groups in Experiment 1. The highest value of the fertility was in the sheep of group MPA / 42 hours -
58.33%, and the lowest value in FGA / 48 hours after sponge removal – 36.36%. In Experiment 2, fertility was also higher, but not statistically significant, in the MPA group was 54.55% versus 41.67% for the FGA group.
from the North-Eastern Bulgarian thin fleece breed - Shumenski type. Four experimental groups were formed depending on the progestagen source and the time of the timed artificial insemination, after removing the vaginal sponges (FGA /48; FGA/42; MPA/48; MPA/42). The sponges stay for all groups was 12 days. At the time of removal of the sponges, 500 IU of PMSG was injected. Experiment 2. was conducted with 23 ewes aged 2-5 years from Synthetic population Bulgarian milk. Two experimental groups were formed depending on the progestagen source: MPA / FGA.The stay of sponges for all groups was 5 days. At the time of sponge removal, 400 IU of PMSG was injected.No significant differences were found in the values of the fertility results in the experimental groups in Experiment 1. The highest value of the fertility was in the sheep of group MPA / 42 hours -
58.33%, and the lowest value in FGA / 48 hours after sponge removal – 36.36%. In Experiment 2, fertility was also higher, but not statistically significant, in the MPA group was 54.55% versus 41.67% for the FGA group.
Keywords: fertility; FGA; MPA; progestogens; sheep
Date published: 2023-06-28
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