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Ovarian Follicular Dynamics in Fogera and Jersey Cattle Breeds in Ethiopia

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Yadeta D., Jemal J., Bedassa A., Kelbessa S., Dinka H.
World News of Natural Sciences
|
2022
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vol. 45
103-116
EN
Understanding the reproductive physiology of female animals is used to optimize reproductive management of dairy cattle. This study was conducted at Adea Berga Dairy Research sub Center of the Ethiopian Institute of Agricultural Research. A total of 15 experimental animals were used to characterize the follicular dynamics of Fogera (n=9) and Jersey (n=6) dairy cattle breeds. Characterization of ovarian follicular dynamics was done using a trans-rectal real-time B-mode ultrasound system for three consecutive estrus cycles; and behavioral estrus signs were visually observed and recorded. Fogera cows manifested two (n=2, 29.62%), three (n=5, 55.55%), and four (n=1, 14%) follicular waves whereas Jersey cows showed two (n=2, 38.9%) and three (n=4, 61.11%) follicular waves. Cycle length or inter ovulatory interval was 20.35 ± 2.8 and 20.67 ± 2.6 days for Fogera and Jersey cows, respectively. The mean number of follicular population per animal was 13.9 ± 5.9 for Fogera and 17.9 ± 7.0 for Jersey cows. There was a significant (p<0.001) difference in follicular number observed between the two breeds. The mean maximum diameter of the ovulatory follicle for Jersey cows was 17.2 ± 0.86 mm and for Fogera 15.22 ± 1.3 mm. There was no statistical difference between the breed in terms of inter-ovulatory interval (IOI), however, there was significant difference (p<0.001) between the breeds in number of follicular population and ovulatory follicle size. In conclusion, behavioral signs of estrus were weaker in fogera breeds as compared to their Jersey counterpart, and relatively higher number of ovarian follicles recorded in Jersey than Fogera cattle breed.
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