Synchronization and Resynchronization as a Novel Approach for Improving Reproductive Performance of Postpartum Dairy Cows

Estrus synchronization and suitable resynchronization intervention is crucial part of improved reproductive management in dairy industry. Our objectives were to appraise CIDR-EB based estrus synchronization and used CIDR-Ovsynch based resynch protocol in lactating Holstein cows at two different geog...

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Bibliographic Details
Published in:Pakistan journal of zoology 2019-04, Vol.51 (2), p.511
Main Authors: Shahzad, A.H., Sattar, A., Husnain, A., Ahmad, I, Ahmad, N, Nak, D, Nak, Y
Format: Article
Language:English
Subjects:
Animal lactation
Animal reproduction
Artificial insemination
Cattle
Dairy cattle
Dairy industry
EDTA
Estrus
Experiments
Fertility
Geographical locations
Gonadotropin-releasing hormone
Medical examination
Methods
Postpartum
Pregnancy
Progesterone
Public relations
Reproduction
Sex hormones
Synchronism
Synchronization
Ultrasonic imaging
Veterinary research
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Summary:Estrus synchronization and suitable resynchronization intervention is crucial part of improved reproductive management in dairy industry. Our objectives were to appraise CIDR-EB based estrus synchronization and used CIDR-Ovsynch based resynch protocol in lactating Holstein cows at two different geographical locations. On location A, 160 postpartum cows were enrolled in standard CIDR-EB protocol. Cows were subjected to timed AI and randomly assigned into two groups: 1) control (n=70), subjected to AI on detected estrus (AIDE) from d18-d30 post TAI. Pregnancy rate was diagnosed on d30, d60 and d90 post TAI, 2) resynch (n=90) received CIDR from d14-d21 post TAI. On day 23, all cows received GnRH shot and open cows received remaining Ovsynch protocol. Blood was collected on d14,d16 and d30 for P4 profile. Cross-sectional area of luteal tissue was measured on d30 in pregnant animals in both groups. In experiment II, both control (n=64) and resynch (n=54) groups were similarly treated as in experiment I, without P4 profile and luteal cross-sectional area measurement. Pregnancy rate(PR) was compared by PROC FREQ of SAS. Effect of treatment on circulatory P4 profile and luteal tissue cross-sectional area were analyzed using GLM procedures (P
ISSN:0030-9923
DOI:10.17582/journal.pjz/2019.51.2.511.520