Effect of short-term feeding high energy diet and chorionic gonadotropins injection on follicular dynamics, blood metabolites and reproductive performance in Naeini ewes
Message:
Abstract:
Effect of short-term feeding high energy diet along with eCG and hCG injection on follicular dynamics, blood metabolites, double ovulation and twinning rates in Naeini ewes was evaluated. For this purpose, 45 Naeini ewes (3-4 years old) were randomly assigned to 3 experimental groups: 1- Maintenance diet + eCG (Me), 2- Short-term high energy diet + eCG (HEe) and 3- Short-term high-energy diet + eCG and hCG (HEeh). All ewes were synchronized by inserting intravaginal progesterone sponges for a period of 12 days during the breeding season. The short-term feeding was started 4 d before until 1 d after sponge removal (for a 6 d period). The eCG injection was done 1 d before sponge removal and hCG injection was done on the day of sponge removal and 1 d later. Results showed that regardless of the kind of hormone injection, feeding high energy diet increased (P<0.05) the medium and large follicles population. The HEe and HEeh groups had higher (P<0.05) serum glucose, cholesterol and insulin, but lower (P<0.05) serum urea nitrogen compared with Me group. In HEe and HEeh groups, (P<0.05) serum oestradiol decreased before sponge removal and increased (P<0.05) after that. The HEeh ewes had highest (P<0.05) twinning rate (42.9%). In general, short-term feeding (6-day) high energy diet along with chorionic gonadotropins injection improved the follicular development, blood parameters and reproductive performance in Naeini ewes.
Article Type:
Research/Original Article
Language:
Persian
Published:
Animal Sciences, No. 124, 2019
Pages:
77 - 90
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