| Autor: |
Satheshkumar, Soundarapandian, Janani, Prabaharan Yuvan, Prakash, Subramanian, Raja, Sengodan, Jayaganthan, Ponnusamy, Arunmozhi, Narayanasamy |
| Předmět: |
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| Zdroj: |
Indian Journal of Animal Reproduction; Dec2023, Vol. 44 Issue 2, p27-30, 4p |
| Abstrakt: |
The effect of gonadotropin releasing hormone (GnRH) analogue on the ovulatory response of pre-ovulatory follicle (POF) during winter and summer months of the year was studied. A total of 120 crossbred cows brought for insemination with oestrus signs during winter months (December 2022 -January 2023; n=52) and summer months (April - May 2023; n=68) were studied. Oestrus (Day 0) was identified by gynaeco-clinical and ultrasound examination and animals were inseminated with (n =33) or without (n = 87) GnRH analogue (Buserelin acetate 10 mcg; im). The biometry of POF and regressing corpus luteum (RCL) were measured ultrasonographically on Day 0 and the POF was observed every 24 hours until ovulation. The diameters of the POF and RCL on Day 0 were similar between the periods of study. Ovulations occurred on the mean days of 1.00 and 1.37 ±0.18 in GnRH group during summer (S-Gn) and winter months (W-Gn) respectively. The respective mean days in non-GnRH group were 1.14 ±0.05 and 1.33±0.08 during summer (S-O) and winter months (W-O). In S-Gn group all the animals (100%) ovulated on Day 1, when compared to W-Gn animals (62.50%). On exploring the possible effect of RCL on ovulation, significantly increased percentages of ovulations occurred in the contralateral ovary to the ovary having the RCL in GnRH groups and vice-versa in non-GnRH groups. Due to increased percentage of induced ovulations, it could be assumed that GnRH administration on the day of insemination may be beneficial during the summer months of the year. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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