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Assessment of Estrus Response and Fertility Rate in Thari Cows Following Estrus Synchronization During Peak and Low Breeding Season

Assessment of Estrus Response and Fertility Rate in Thari Cows Following Estrus Synchronization During Peak and Low Breeding Season

Shakeel Ahmed Wagan1, Akeel Ahmed Memon1, Qudratullah Kalwar2*, Asmatullah kaka1, Mohammad Farooque Hassan2, Hidayatulah Soomro2, Safia Kadhro3, Abdullah Sethar4 and Muhammad Jehangeer5

1Faculty of Animal Husbandry and Veterinary Sciences, Sindh Agriculture University, Tando Jam, 70060, Pakistan 
2Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
3Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Science, Lanzhou 730050, Gansu, China, Nanjing Agriculture University China
4Directorate of Animal Breeding, Hyderabad
5Livestock and Fisheries Department Government of Sindh, Karachi
 
* Corresponding author: qudratullahkalwar@gmail.com

ABSTRACT

To investigate the influence of estrus synchronization protocols following ovsynch and ovsynch + CIDR in Thari cows during different breeding seasons. Total (n=80) Thari cows 1st to 4th parity were selected for this study. The experiment was conducted twice in a year i.e. in October to January, n=40 (Peak breeding season) and March to May, n=40 (Low breeding season). Animals were divided into three groups (A, B and C). In group A, 02ml I/M injection of GnRH (25µg lecirelin acetate) were injected on day 0 and 9th of the treatment. On 7th day 05ml I/M injection of PGF2α analogue (5mg/ml dinoprost tromethamine) was administered. The group B animals received same treatment but Controlled Internal Drug Releasing Device (CIDR) (containing 1.38mg progesterone) inserted into vagina on 0 day of the treatment and removed on 7th day of the treatment. Group C (Control group) received 02ml normal saline on 0, 7th and 9th day of the treatment. The positivity of estrus in peak and low breeding seasons was higher in Group B (88.88% and 60%) followed by Group A (73.33% and 46.66%) and Group C (14.28% and 10%). Similarly Group B animals showed higher fertility rate (66.66% and 46.66%) followed by Group A (53.33% and 26.66%) and C (00% and 00%) during peak and low breeding seasons. It was concluded that the ovsynch plus CIDR induces superior estrus incidence and fertility as matched to other treatments and control group.

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Pakistan Journal of Zoology

February

Vol. 55, Iss. 1, Pages 1-500

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