Presynchronization with CIDR improved the efficiency of ovsynch in the cyclic and acyclic Postpartum Pluriparous Cows

Ahmed Ahmed,Omar Zain,Alaa Eldin Zain Elabdeen

doi:10.21608/zvjz.2017.7690

Ahmed Ahmed, Omar Zain + Show 1 more

Open Access

https://doi.org/10.21608/zvjz.2017.7690

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Abstract

The postpartum period is considered an important period in the reproductive life of dairy cows. This study was aimed to evaluate the effect of progesterone (P 4 )-CIDR supplementation in the course of Ovsynch regimens in postpartum Holstein-Friesian dairy cows. Eighty Holstein Friesian dairy cows were used. All animals were gynaecologically examined for uterine involution and ovarian resumption by rectal ultrasound scan. Those with history of endometritis, caesarean section, dystocia, retained placenta, acute mastitis, lameness or other unhealthy were excluded. Fifty-two cows were cyclic and twenty eights were non-cyclic. Animals were divided into three synch-regimens. The 1 st group (N=27), used as a control, is the ovsynch regimen only in which the animals were treated with GnRH-PGF 2α -GnRH (GPG), the 2 nd group (N=26) in which the GPG was presynchronized with controlled internal drug release (CIDR) device before (CIDR-GPG), and the 3 rd group (N=27) in which CIDR device was incorporated into GPG, after the first GnRH injection (G-CIDR-PG). Blood samples were collected 5 times (day -7, 0, 7, 14 and 50) for measuring P 4 using enzyme-immunoassay (EIA) technique. Ultrasound examinations were performed on days -7, 0, 7 and 9 for following up the ovarian changes, and repeated at 35, 45 and 50 days post-insemination for pregnancy diagnosis. Conception rate was variable among groups. It was increased by 69.23, 51.85 and 40.74% in CIDR-GPG, G-CIDR-PG regimens treated groups and GPG-control group, respectively. The conception rate was higher in the cyclic versus acyclic GPG group (44.4 vs. 33.3 %). On the other hand, acyclic cows were highly responsive than cyclic cows in CIDR-GPG group (70.0 vs. 68.8%) and G-CIDR-PG group (55.6 vs. 50.0%). In conclusion, we recommend that the CIDR-GPG regimen is improving fertility and conception rate in postpartum dairy cows.

Highlights

The animal's reproductive performance greatly affects its productivity and subsequently its profitability [1]
In GPG group, the acyclic animals showed lower conception rates than those cyclic (33.3 vs. 44.4 %) but the response was reversed in the controlled internal drug release (CIDR)-treated ovsynch groups where the acyclic animals showed higher conception rates compared to cyclic in the CIDR-GPG (70.0 vs. 68.8 %) and G-CIDR-PG (55.6 vs. 50.0 %) (Table 2)
This result was in accordance with Kawate et al [20] who reported that the addition of CIDR to the ovsynch protocol (G-CIDR-PG) improved the conception rates in postpartum Japanese Black beef cows

Summary

Introduction

The animal's reproductive performance greatly affects its productivity and subsequently its profitability [1]. The interval between parturition and first service should be less than 90 days [3]. It could be achieved by the early resumption of ovarian activity and higher conception rates. Most of dairy farms depend on artificial insemination (AI) in reproduction, conception rates were dramatically decreased from 66% to about 35% since 1973 till 2000 parallel to the use of AI and higher dry matter intake [4,5]. Depending on the fact that progesterone (P4) is necessary to fertility and its level before insemination was found to be positively correlated to the subsequent conception rate [6,7]

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