Estimation of deltamethrin residues in cow's and goat's environment and trials to reduce its level in milk

Research (Published online: 11-05-2018)

6. Estimation of deltamethrin residues in cow's and goat's environment and trials to reduce its level in milk

Halla E. K. El Bahgy, Hend A. Elbarbary and Samar S. Ibrahim

Veterinary World, 11(5): 606-611

ABSTRACT

Aim: The present study was aimed to estimate deltamethrin residues in cow's and goat's environment over a certain period of time post-application, to identify the role of both feed and water as a source of pesticides, and to conduct some trials to reduce their levels in milk.

Materials and Methods: A total of 80 water and feed samples (40 of each) and 120 milk samples (80 cow's milk and 40 goat's milk) were collected. Fresh milk samples were collected directly from the udder as well as from feed and water before application and 1st, 2nd, 3rd, 7th, 15th, 21st, and 35th days after insecticide application.

Results: Deltamethrin residues were detected after its application in both water and feed at different levels up to the first 3 days and in all cow's and goat's milk samples at 35th day. The highest levels were detected in milk samples at the 2nd day then at the 7th day followed at the 15th day after application as such levels were above the maximum residual limits. By microwaving the polluted cow's milk samples, deltamethrin residues were not detected without influencing the chemical composition of the milk. However, on freezing of milk, the deltamethrin residues reached 12.6±3.24 μg/L in association with a significant decline in the concentration of fat.

Conclusion: Microwaving of milk is an effective method to decline deltamethrin concentration in milk.

Keywords: deltamethrin, freezing, high-performance liquid chromatography, microwaving treatment, milk, pesticides residues.

A retrospective study of bovine tuberculosis at the municipal abattoir of Bauchi State, Northeastern Nigeria

Research (Published online: 10-05-2018)

5. A retrospective study of bovine tuberculosis at the municipal abattoir of Bauchi State, Northeastern Nigeria

Saleh Mohammed Jajere, Naphtali Nayamanda Atsanda, Asinamai Athliamai Bitrus, Tasiu Mallam Hamisu and Mohammed Dauda Goni

Veterinary World, 11(5): 598-605

Background and Aim: Bovine tuberculosis (bTB) still remains a major zoonotic bacterial disease affecting livestock and humans worldwide. The disease remains a poorly managed tropical disease in most developing countries of the world; where in addition to productivity losses and significance in international trade, it posed a major public health threat to both humans and animals. A retrospective study was designed to investigate the occurrence of bTB lesions at Bauchi municipal abattoir.

Materials and Methods: The study utilized abattoir records spanning a period of 10 years (2004-2013). The records indicated that a total of 1,08,638 heads of cattle comprising n = 56,070 males and n = 52,570 females were slaughtered at the municipal abattoir during the study period.

Results: Of these heads, n = 1230 (1.13%) (95% confidence interval [CI]: 1.07, 1.19) had tuberculous lesions. The annual occurrence during the study period varied significantly (p<0.001) from 0.53% (95% CI: 0.40, 0.67) to 1.87% (95% CI: 1.66, 2.10) in 2010 and 2012, respectively. Females had a significantly higher (p<0.001) prevalence of 2.10% (95% CI: 1.98, 2.23) compared with the males 0.23% (95% CI: 0.19, 0.27). The distribution of suspected gross bTB lesions in different organs showed 11.87% in the lungs, 5.93% in the liver, 1.14% in the heart, and 0.49% accounted for generalized bTB. However, none was observed on the lymph nodes and intestines.

Conclusion: It can be concluded that bTB persists in Bauchi State with annual variations during the study period. This study highlights the importance of meat inspection as an important tool for detecting the presence of bTB lesions.

Keywords: Bauchi, bovine tuberculosis, Mycobacterium bovis, prevalence, retrospective.

Effect of the essential oil of Rosmarinus officinalis (L.) on rooster sperm motility during 4°C short-term storage

Research (Published online: 09-05-2018)

4. Effect of the essential oil of Rosmarinus officinalis (L.) on rooster sperm motility during 4°C short-term storage

L. Touazi, B. Aberkane, Y. Bellik, N. Moula and M. Iguer-Ouada

Veterinary World, 11(5): 590-597

Aim: This study aimed to investigate the protective effect of Rosmarinus officinalis (L.) essential oil on rooster sperm motility during 4°C short-term storage.

Materials and Methods: R. officinalis essential oil was analyzed using gas chromatography coupled to mass spectrometry to identify the active components. 10 of 45-week-old Hubbard commercial broilers were subjected to biweekly semen collections during 3 weeks. At each collection, sperm was pooled and divided into four aliquots and then diluted with Tris extender supplemented with 870, 87, or 8.7 μg/ml of R. officinalisessential oil, identified as treatments R, R5, and R10, respectively. Tris-based extender without any supplementation was considered as a control group. Diluted sperm was then stored at 4°C in the refrigerator and analyzed at 0, 6, 24, and 48 h using a computer-assisted sperm analyzer. Different semen parameters were measured including total motility, progressive motility, gametes velocities (straight line velocity [VSL], curvilinear velocity [VCL], and average path velocity [VAP]), amplitude of the lateral head displacement [ALH], and beat-cross frequency [BCF].

Results: The phytochemical analysis of R. officinalis essential oil revealed the presence of 25 active components including seven major molecules: Camphor (18.88%), camphene (5.17%), 1,8-cineole (7.85%), β-thujene (13.66%), α-thujene (4.87%), chrysanthenone (12.05%), and β-cubenene (7.97%). The results showed a beneficial effect of R. officinalis essential oil on sperm cells motility, particularly when using the lowest concentrations, 8.7 and 87 μg/ml. Progressive motility and gametes velocities (VCL, VSL, and VAP), materializing the quality of gametes motility, showed highly statistically significant values (p<0.01) in 8.7 and 87 μg/ml treatments, especially from 6 h of storage at 4°C. Conversely, the highest concentration (870 μg/ml) showed harmful effects with a total spermicidal activity after 24 h of storage.

Conclusion: The current results revealed the positive impact of R. officinalis essential oil on rooster sperm at 4°C short-term storage probably through fighting against oxidative stress and cold shock damages.

Keywords: antioxidant, avian semen, liquid storage, rosemary essential oil.

Prevalence of Cryptosporidium spp. oocysts in dogs in Lusaka district of Zambia

Research (Published online: 06-05-2018)

3. Prevalence of Cryptosporidium spp. oocysts in dogs in Lusaka district of Zambia

Lamson Mugala, Joyce Siwila, Ngonda Saasa and Girja Shanker Pandey

Veterinary World, 11(5): 585-589

ABSTRACT

Aim: Cryptosporidium is one of the causes of diarrheal illness in man and animals worldwide and is zoonotic. The study aimed to determine the prevalence and risk factors associated with fecal shedding of Cryptosporidium oocysts in dogs in Lusaka district of Zambia.

Materials and Methods: A cross-sectional study was conducted in Lusaka district of Zambia during 2015-2016. A total of 390 dogs (243 males and 147 females) aged 2 months-13 years were enrolled. Fecal samples were collected and stained using modified Ziehl-Neelsen and Auramine O staining techniques and examined microscopically for oocysts.

Results: Overall, the prevalence of Cryptosporidium oocysts infection was 5.9% (23/390; 95% confidence interval: 3.9-8.7). Prevalence among male dogs and female dogs was 5.3% and 6.8%, respectively. Older dogs had a relatively higher infection rate compared to the younger puppies. There was a statistically significant difference in infection between nondescript breed and pure breeds with prevalence being higher in nondescript dog breeds. Water source was also significantly associated with Cryptosporidium infection.

Conclusion: Cryptosporidium infections are common, especially among the nondescript breed of domestic dogs in Lusaka district of Zambia. Further studies to characterize the common species are warranted.

Keywords: Cryptosporidium spp., dogs, Lusaka, prevalence, Zambia.

Epidemiology and diagnosis of feline panleukopenia virus in Egypt: Clinical and molecular diagnosis in cats

Research (Published online: 04-05-2018)

2. Epidemiology and diagnosis of feline panleukopenia virus in Egypt: Clinical and molecular diagnosis in cats

Romane A. Awad, Wagdy K. B. Khalil and Ashraf G. Attallah

Veterinary World, 11(5): 578-584

ABSTRACT

Aim: This work aimed to study epidemiology and diagnosis of feline panleukopenia virus (FPV) using clinical examination, direct ELISA, RNA viral isolation and identification, and knowing phylogenetic tree of our isolate.

Materials and Methods: One hundred and sixty-five cats of different ages and sex were examined. Each cat was examined clinically to detect the clinical manifestations of the disease showing symptoms suggestive of feline panleukopenia (FP) as well as ELISA, and polymerase chain reaction (PCR) amplification analyses were conducted.

Results: Our finding includes (a) clinical signs detected in 165 of 165 cats were in the form of lethargy, fever, anorexia, thirst, vomiting, diarrhea, dehydration, and leukopenia. (b) ELISA results revealed that 66 of all examined cats were positive for FPV. (c) The amplification products from all positive samples were confirmed as FPV (VP1) gene by nucleotide sequences analysis, in which 75 samples were positive using PCR amplification for the FPV. (d) Statistical evaluation of ELISA results in comparison to PCR findings. ELISA showed 88%, 100%, and 94.5% for sensitivity, specificity, and accuracy, respectively, while the prevalence of FP among the examined population was 45%. No effect on sex, breed, and age on ELISA results as recorded using Chi-square analysis.

Conclusion: The results of the sequence analysis indicated that PCR products of the FPV cDNA exhibited very low variation in their nucleotide sequence of all isolates compared with the published FPV genome, which could be suggested that FPV appears to be genomically stasis compared with other Parvoviruses. The genome sequence of FPLV strain in this study has been deposited in GenBank under the accession number KY466003. Our isolate closely related 100% to isolates from Portugal, which might be the origin of infection to Egypt through importation of cats.

Keywords: cats, Egypt, ELISA, epidemiology, feline panleukopenia, feline panleukopenia virus, polymerase chain reaction, sequencing.

Milk somatic cells, factors influencing their release, future prospects, and practical utility in dairy animals: An overview

Review (Published online: 02-05-2018)

1. Milk somatic cells, factors influencing their release, future prospects, and practical utility in dairy animals: An overview

Mohanned Naif Alhussien and Ajay Kumar Dang

Veterinary World, 11(5): 562-577

ABSTRACT

Milk somatic cells (SCs) are a mixture of milk-producing cells and immune cells. These cells are secreted in milk during the normal course of milking and are used as an index for estimating mammary health and milk quality of dairy animals worldwide. Milk SC is influenced by cow productivity, health, parity, lactation stage, and breed of an animal. Any change in environmental conditions, poor management practices, and also stressful conditions significantly increases the amount of SC coming in milk. Better hygiene and proper nutrition help in reducing milk SC. Milk with low SC means better milk products with a longer shelf life. The present review describes the role of SCs (both secretory and immune) in milk, their role in maintaining the integrity of the mammary gland, and factors affecting their release in milk. This information may help to reduce milk somatic cell counts (SCCs) and to establish differential SCC standards.

Keywords: dairy animals, factors influencing, milk, somatic cells release, utility.

Cloning and sequence analysis of a partial CDS of leptospiral ligA gene in pET-32a - Escherichia coliDH5α system

Research (Published online: 30-04-2018)

23. Cloning and sequence analysis of a partial CDS of leptospiral ligA gene in pET-32a - Escherichia coliDH5α system

Manju Soman, Mangattuparambil Mini, Siju Joseph, Jobin Thomas, Nirmal Chacko, T. G. Sumithra, R. Ambily, Binu K. Mani and Rinsha Balan

Veterinary World, 11(4): 557-561

ABSTRACT

Aim: This study aims at cloning, sequencing, and phylogenetic analysis of a partial CDS of ligA gene in pET-32a - Escherichia coli DH5α system, with the objective of identifying the conserved nature of the ligA gene in the genus Leptospira.

Materials and Methods: A partial CDS (nucleotide 1873 to nucleotide 3363) of the ligA gene was amplified from genomic DNA of Leptospira interrogans serovar Canicola by polymerase chain reaction (PCR). The PCR-amplified DNA was cloned into pET-32a vector and transformed into competent E. coli DH5α bacterial cells. The partial ligA gene insert was sequenced and the nucleotide sequences obtained were aligned with the published ligA gene sequences of other Leptospira serovars, using nucleotide BLAST, NCBI. Phylogenetic analysis of the gene sequence was done by maximum likelihood method using Mega 6.06 software.

Results: The PCR could amplify the 1491 nucleotide sequence spanning from nucleotide 1873 to nucleotide 3363 of the ligA gene and the partial ligA gene could be successfully cloned in E. coli DH5α cells. The nucleotide sequence when analyzed for homology with the reported gene sequences of other Leptospira serovars was found to have 100% homology to the 1910 bp to 3320 bp sequence of ligA gene of L. interrogansstrain Kito serogroup Canicola. The predicted protein consisted of 470 aminoacids. Phylogenetic analysis revealed that the ligA gene was conserved in L. interrogans species.

Conclusion: The partial ligA gene could be successfully cloned and sequenced from E. coli DH5α cells. The sequence showed 100% homology to the published ligA gene sequences. The phylogenetic analysis revealed the conserved nature of the ligA gene. Further studies on the expression and immunogenicity of the partial LigA protein need to be carried out to determine its competence as a subunit vaccine candidate.

Keywords: cloning, Escherichia coli DH5α, Leptospira, ligA, pET-32a, phylogenetic tree.