Wahid Ahmed

Wahid Ahmed
National Research Center, Egypt | NRC · Department of Animal Reproduction and Artificial Insemination

Research professor

About

190
Publications
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619
Citations

Publications

Publications (190)
Article
Full-text available
The study was conducted with the objectives of estimating the prevalence of major reproductive disorder of dairy cows and the possible risk factors in urban and periurban dairy farms in Hawassa City from October, 2016 to May, 2017. A total of 398 dairy cows were studied, out of which, 36.7% (n=146) were affected by at least one reproductive health...
Article
Full-text available
Infertility has been linked to numerous factors in higher producing dairy cattle. Although infectious agents affect fertility, many non-infectious factors cause infertility in dairy cows. Thus, major non-infectious causes of infertility in dairy cattle include congenital abnormalities, acquired lesions, nutritional, seasonal and environmental cause...
Article
Full-text available
This study was conducted to observe the breeding management practices, reproductive performance and flock structure of Begait sheep breed. It was made by selecting 126 households found from two districts in the western zone of Tigray regional state, Ethiopia. An exploratory survey was undertaken to understand traditional management practices, flock...
Article
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The aim of the study was to assess the productive and reproductive performance of crossbred dairy cows in South Western Ethiopia. A total of 60 small-scale dairy farm owners were randomly selected and interviewed with pre-tested structured questionnaire to obtain information on the productive and reproductive performance of cows. The General Linear...
Article
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Abstract: Fetal membranes or what is known as “placenta” is an essential organ for prenatal transfer of nutrients and oxygen from the dam to the fetus. The normal separation of fetal membranes consists of complex hormonal process that starts before parturition in cows, which normally drops within shortly after birth. If the placenta is not expelled...
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Reproductive health problems are one of the most important problems that affect the production and productivity of dairy cows. Dystocia is also one of the reproductive health problems that cause considerable economic loss to the dairy industry. The main aims of this manuscript were to review risk factors and economic impact of dystocia in dairy cow...
Article
Nutritional imbalances, deficiencies, or erratic management of feeding programs for dairy cows can create large numbers and various types of health problems generally categorized as metabolic diseases. High producing dairy cows are the most susceptible to metabolic diseases during the periparturient period. During this period the animal is tremendo...
Article
Pregnancy diagnosis is an essential part of fertility management. Early detection of pregnancy allows early recognition and treatment of problems. The aim of this manuscript is to overview the methods of pregnancy diagnosis in cow and to highlight the advantages of pregnancy diagnosis in relation to fertility management. Methods of pregnancy diagno...
Article
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DNA vaccines represent a new leading edge in vaccine technology. Eventually, the factors that will make a DNA vaccine attractive for a certain disease will include its reduced cost, its ease of transport and administration, its ability to act in the face of maternal antibodies, the ability to differentiate diseased animals from vaccinated animals a...
Article
DNA vaccines represent a new leading edge in vaccine technology. Eventually, the factors that will make a DNA vaccine attractive for a certain disease will include its reduced cost, its ease of transport and administration, its ability to act in the face of maternal antibodies, the ability to differentiate diseased animals from vaccinated animals a...
Article
Deoxyribonucleic acid (DNA) vaccination is the administration of the gene encoding the antigen and consequently, the antigen expression by cells in the vaccinated hosts and triggering the host immune system. DNA fish vaccines against viral pathogens had limited success and most efficient delivery route is IM injection. Suitable delivery strategies...
Article
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Brucellosis is a serious disease that causes direct and indirect losses in all primates through abortion, stillbirth, metritis and reduction in the milk production. Diagnosis of brucellosis is based on both bacteriological and serological examinations. Recently, immunogenetic studies and genetic polymorphism are used to investigate the susceptibili...
Article
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One of the physiological causes for true anestrum is a low level of ovarian estrogens. Estrogens are imperative for reproductive development, fertility, bone growth and sexual behavior. The key enzyme in estrogen biosynthesis is cytochrome P450 aromatase, the protein product of CYP19 gene. The genetic polymorphism of CYP19 gene might influence fert...
Article
The current study was designed to find out the possible correlations between gene markers of some blood protein loci and semen characteristics of 18 Purebred Arabian stallions. Serum protein electrophoresis was carried out and gene frequency of genetic loci was estimated: 6 blood protein loci were used as genetic markers Albumin (Al), transferrin (...
Article
Full-text available
Foodborne pathogens cause a considerable public health burden and challenge. They cause illnesses and deaths in all populations, particularly in groups at risk such as infants, children, elderly and immunocompromised persons. Diarrheal diseases, almost all of which are caused by foodborne or waterborne microbial pathogens, are leading causes of ill...
Article
Full-text available
The present study aimed to evaluate some genetic markers of blood proteins and their relationship to some reproductive parameters in Purebred Arabian mare. Breeding records and data of Arabian mares have been collected and analysed regarding age of mares, number of parity, number of male parity, number of female parity, interval to foaling heat, in...
Article
Investigations were carried out on 26 pure- bred Arabian mares to detect the genetic markers that may control the repeat breeding phenomenon in Arabian mares. Serum protein electrophoresis was carried out for genotyping blood protein loci and estimation of gene frequencies in both fertile and repeat breeder mares. Results indicated predominance of...
Article
Full-text available
Problems of fertility hinder the productive and reproductive performances of farm animals. Moreover, it causes great economic losses, especially in small holder farms, whereas animals are exposed to a lot of stressful conditions. The current investigation was a trial to improve the reproductive performance of native Egyptian cows suffering from red...
Article
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Rice is the world's second largest cereal crop after wheat, however, it produces large amounts of crop residues. Only about 20% of rice straw was used for purposes such as ethanol, paper, fertilizers and fodders and the remaining amount is either removed from the field, in situ burned, piled or spread in the field, incorporated in the soil, or used...
Article
Brucellosis is a complicated disease in terms of epidemiology, diagnosis and control. Although many serological tests and new automated blood culture techniques have been developed to diagnose brucellosis, there are still significant problems in the diagnosis of the disease. The present work aimed to evaluate the diagnostic yield of the two main se...
Article
Full-text available
Brucellosis is still an endemic disease in human and animals of most developing countries; despite all attempts that were adopted worldwide to control the disease. This study was carried out to monitor the current prevalence of brucellosis in Egypt with emphasis on some relevant risk factors. 1935 animals raised at Lower Egypt (305 local cows, 1103...
Article
Embryo transfer technique has been widely used worldwide, whereas it can increase the number of offspring that can be obtained from supergenetic females. The present work was conducted to compare between mature buffalo cows and heifers in superovulatory response, embryo recovery and calving rates. In 11 buffalo cows and 3 heifers, estrous synchroni...
Article
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A total of 3996 serum samples was collected from aborted ewes and does in 11 flocks at five governorates of Al-Kaseem area, KSA during 2006-2007. Only 2411/3996 (60.33%) were brucella seropositive, while 1585/3996 (39.7%) animals were brucella sero-negative. 278 out of the 1585 animals (17.53%) were positive for one or both of Toxoplasma gondii and...
Article
Full-text available
Ovarian inactivity is the major constraint for proper productivity in buffaloes in Egypt and most of developing countries having buffaloes. This disorder causes great economic losses due to decreased calf crop and milk yield. The current study was carried out to monitor the current status of ovarian inactivity in Egyptian buffaloes during the last...
Article
The present study was carried out on a total number of nine healthy pregnant does free from BVD neutralizing antibodies. The animals were I/V and I/P inoculated with two cytopathic strains of BVD virus (NADL-camel strains) at about 65 days of gestation. In NADL strain group, abortion occurred in 3 out of 5 virus inoculated does. Meanwhile, the rema...
Article
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A total number of 160 local Egyptian cows (N=60) and buffalo cows (N=100) raised at Al Sharkia governorate was clinically examined during May-October 2010. Samples from blood and nasal swabs were collected from healthy animals as well as from animals showing clinical signs similar to those caused by Bovine Ephemeral fever (BEF) infection. These ani...
Article
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This study was carried out to investigate the phenomenon of retained placenta (RP) in buffaloes, since there is no enough data on this reproductive disorder in buffaloes under the prevailing Egyptian condition. Also, comparison of some relevant blood constituents in relation to RP was another target. A total number of 813 heads of buffalo-cows was...
Article
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2 Abstract: Lice infestation has major impacts on the productivity and welfare of livestock. The current study was carried out to throw light on the effect of lice infestation on general health condition and ovarian activity in buffalo-cows with emphasis on its control by an alternative safe way. A total number of 1583 buffalo-cows reared at Lower...
Article
This study was designed to associate Blood Lead Concentration (BLC), reproductive disorders and oxidant/antioxidant status in female buffaloes reared besides high ways. Animals were clinically examined and blood samples were collected from 30 non pregnant female buffaloes for assaying of lead and some oxidant/antioxidant values. According to BLC, a...
Article
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2 Abstract: This study was designed to focus on the relationship between clinical endometritis and ovarian activity with emphasis on the oxidative status of the animals. A field survey was carried out on 813 buffalo-cows in some veterinary clinics at Lower Egypt. Animals were clinically and gynecologically examined, vaginal swabs and blood samples...
Article
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Investigations were carried out to monitor some reproductive parameters in Friesian cows under the prevailing local Egyptian conditions. Special emphasis was given to evaluation of fertility and the correlation between fertility index and milk production was determined using immunogenetic analyses. The available records of large governmental farm w...
Article
In the present study, gynaecological examinations were carried out on 916 buffaloes and samples of vaginal swabs, blood and milk were collected. Serum samples were checked for brucellosis and assayed for progesterone level. Vaginal swabs and milk samples were examined for zoonotic bacteria that may be transmitted to veterinarians during handling an...
Article
Contents: Investigations were performed to determine I) Cyclic changes in uterine immune response of buffalo-cows that could be responsible for increased susceptibility of the diestrous uterus to infection, 2) The effect of some genital disorders on the immune response. The number and phagocytic capacity of uterine leucocytes as well as the immunog...
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The present study aimed to investigate oxidant/antioxidants status and some biophysical properties of hemoglobin in preweaning buffalo calves in relation to their vitality. A total number of 253 buffalo calves (2-3 months old) were clinically examined, the vitality of these animals were recorded and blood samples were collected for determination of...
Article
Full-text available
Out of 360 female buffaloes, examined in Lower Egypt during a period of two years (2004-2006), 171 (47.5%) were suffering from reproductive disorders and 216 (60.0%) were infected with internal parasites. The main recorded reproductive disorders were ovarian inactivity (27.5%), endometritis (8.6%), delayed puberty (8.3%), mastitis (5.8%), retained...
Article
Full-text available
Investigations were carried out on caprine brucellosis in a costal area in Egypt. A total number of 577 Baladi Does was examined for Brucella infection using different serological tests. Specimens were taken from seropositive obligatory slaughtered Does (No = 33) for Brucella isolation, histopathological examination, Polymerase Chain Reaction (PCR)...
Article
Ovarian inactivity hinders the productive and reproductive performances of buffalo and it causes great economic losses, especially in small holder farms, whereas animals are exposed to a lot of stressful conditions. A total number of 372 heads of buffalo%heifers, 2.5 years o ld at least, kept at small holder farms at villages of Lower Egypt was exa...

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