An Approach Study for Reducing the Early Embryonic Loss in Egyptian Buffalo-cows

Mohamed Abd El-Fattah Abo-Farw,Hassab Allah Abdul Gwad Abu Elghait,Maged Ahmed Aboul-Omran,Osama Mostafa Elmalky,Emad Fawzy Elmaghraby

doi:10.11648/j.aap.20200502.17

Mohamed Abd El-Fattah Abo-Farw, Hassab Allah Abdul Gwad Abu Elghait + Show 3 more

Open Access

https://doi.org/10.11648/j.aap.20200502.17

Copy DOI

Abstract

This study evaluated the efficacy of a single gonadotropin-releasing hormone (GnRH) agonist on day 12 or human chorionic gonadotropin (hCG) on day 7 post-mating on pregnancy rate (PR) of repeat breeder buffaloes. Buffaloes (n=21) in heat were naturally mated, and divided into three groups (7 in each). Animals in the 1<sup>st</sup> group (G1) were i.m. injected with 5 ml GnRH on 12-day post-mating, while those in G2 were i.m. injected with 1500 IU of hCG on day 7 post-mating. In G3, animals were kept as control. Results show that PR was higher (P<0.05) in G1 (71.428) and G2 (57.142) than G3 (28.571). The peak of serum P4 was recorded (P<0.05) on day 15 in G2, and day 18 in G1 and G3. On days 21 and 24 post-mating, P4 was the highest (P<0.05) in G1, followed by G2, and the lowest in G3. Average CL diameter increased (P<0.05) CL in G1and G2 compared with G3 on days 15 and 18 post-mating. The concentration of P4 was higher in pregnant than in non-pregnant animals on different post-mating days, regardless of treatment. The concentration of P4 was the highest in pregnant of G2, and the lowest in non-pregnants of G3, being more obvious from 18 to 24-day post-mating. Injection of repeat breeder lactating buffaloes with 5 ml GnRH or 1500 IU hCG on day 12 and 7 post-mating, respectively, improved P4 production and pregnancy rate. GnRH treatment reduced the early embryonic loss showing the highest pregnancy rate to increase the farmer economy.

Highlights

The reproductive efficiency is affected by very wellknown factors like fertilization failure and embryonic mortality, the later being more significant of dairy cattle and buffaloes [8]
Increased in treatment groups (G1 and G2) as compared to G3, but the differences in pregnancy rate (PR) between G1 and G2 or G2 and G3 were not significant (Table 1). These results indicated a positive effect of hormonal treatment, in particular, gonadotropin-releasing hormone (GnRH) injection 12 days post-mating on PR buffalo cows
Higher PR (83.3, 75 and 73.6%) than that obtained in our study was reported by [49] in RB cows, [44] in RB Deoni cows, and [59] in bovine, respectively. comparatively lower PR of 32.0% [43] and 12.50% [40] were reported on repeat breeder cows, or 36.3 [31] and 44.3% [21] in dairy cows

Summary

Introduction

The reproductive efficiency is affected by very wellknown factors like fertilization failure and embryonic mortality, the later being more significant of dairy cattle and buffaloes [8]. Embryonic mortality is considered one of the major causes of fertility loss, especially in the animals that are not mated during their reproductive period [12]. The other 30% of pregnancies are interrupted because of some type of embryonic loss (EL); in 65% of these cases, the embryonic death occurred between the 6th and 18th days of gestation in animals [17]. A major contributing factor of early embryonic death in cattle is believed to be due to low progesterone (P4) production by the corpus luteum, CL [46]. Major of EL occurs in the preimplantation stage (20 days of pregnancy), when 75-80% of fertilized eggs are lost [66]. One of the causes of EL is thought to be the inadequate luteal function [74]

Methods

Results

Conclusion