The aim of the present study was to evaluate mannan oligosaccharides (MOS) or glycerol (GLY) as a carbon source on biofloc systems of Nile tilapia (O. niloticus) juveniles. Fish (n = 750) were reared in open flow (Controls) or biofloc systems (B-GLY and B-MOS) fed with a plant or fish protein source over a period of twelve weeks. Total ammonia nitrogen and nitrate decreased in the biofloc groups, while biofloc volume increased in B-MOS. Compared to the controls, B-MOS and B-GLY exhibited higher weight gain and improved feed conversion, irrespectively of the diet. Serum level of C-reactive protein was reduced, while IgM and lysozyme activity was higher in the B-MOS fish, compared to other groups. Intestinal Bacillus spp. count was increased, whereas Vibrio, Aeromonas and Pseudomonas spp. counts decreased in B-MOS reared groups, compared to the other groups. The proinflammatory cytokine (IL-8 and IFN-γ) transcript expression was upregulated in B-MOS more than B-GLY reared groups. Compared to the controls, the virulence of Aeromonas hydrophila was decreased in the B-MOS and B-GLY groups. The results indicate several benefits of using MOS as a carbon source in a biofloc Nile tilapia system; a cost benefit analysis is required to assess the economic viability of this.

Brucellosis is an important disease of public health significance that leads to severe losses. The current study was carried out to identify the recovered Brucella species , and its prevalence in cows and ewes in Dakahlia and Damietta Governorates during May 2018 to March 2019, with the hemato-biochemical analyses in the positive cases. In the current study, B. melitensis biovar 3 was identified with a total prevalence of 8.75% and 6.98% in cows and ewes, respectively. Hematological results denoted a normocytic normochromic anemia in infected cows and ewes at the 2nd and 4th weeks after abortion group (GP) 2 and GP.3, respectively, with leucocytosis especially in GP.3. Significant hypoproteinemia and hypoalbuminemia were detected in infected cows at the 2nd week after abortion, with non-significant changes at 4th week after abortion. While Brucellosis-infected ewes showed a significant (P < 0.05) hypoproteinemia and hypoalbuminemia at both 2nd and 4th weeks post abortion. The serum AST, ALT, ALP and LDH activities and levels of IL-6 and TNF-α were markedly elevated (P < 0.05) in both infected cow and ewes with markedly lowered serum urea level. Whereas serum glucose level was significantly decreased (P < 0.05) in infected cows (GPs 2 and 3), as well as, infected ewes of GP. 2, with non-significant changes in infected ewes of GP3. The serum creatinine level showed non-significant changes in all infected cows and ewes. Serum immunoglobulin M was significantly increased in both infected cows and ewes of GPs 2 and 3, while immunoglobulin G was significantly elevated in both infected cow and ewes of GP3. Moreover, phagocytic percent and index showed a significant decrease in both infected cows and ewes (GPs2 and 3). Thus, evaluations of hematological, biochemical and immunological parameters together with specific diagnostic tests are necessary to obtain more reliable results for the diagnosis of Brucellosis in cows and ewes.

The present study was carried out to clarify the effect of Foot and Mouth Disease Virus (FMDV) on cattle of different ages with references to studying the hematological parameters, biochemical aspects and cardiac biomarkers after accurate diagnosis of FMDV by reverse transcription-polymerase chain reaction (RT-PCR). Forty-five native breed Egyptian female non pregnant cattle (1-5 years old) were divided into two main groups. Group (1): 15 apparently healthy cattle as control group. This group includes animals at age 1-1.5 year (gp.1a), 2-3 years (gp.1b) and 4-5 years (gp.1c). Group (2): 30 infected cattle with the same age category as the control group (gp. 2a, gp. 2b and gp.2c) were collected from different localities in port- Said Governorate, Egypt during 2016-2017 FMD outbreak. Saliva and vesicular fluid from infected cattle were obtained for RT-PCR and blood samples for hematological and biochemical parameters estimation. The infected cattle showed fever, ropy salivation, vesicular eruptions on buccal mucosa and interdigital space. All the identified viruses were FMDV of serotype ‘O’ which is circulating among cows of different ages in Egypt. Biochemical results revealed a significant decrease in serum total proteins, albumin, globulins and calcium levels, with a significant increase in serum enzyme activities ALP, GGT, AST and serum levels of urea, creatinine, inorganic phosphrous, malonadiadehyde, nitric oxide, Interleukein10 (IL-10), cardiac tropinine I (cTn I) and creatine kinase MB (CK-MB) concentration. It was concluded thatFMDV significantly affects the hematological and biochemical parameters of infected cattle, especially young one. The detection of cTnI is a very sensitive method for determining myocardial cell damage in the earlier stages of the disease. Moreover, RT-PCR is diagnostic biomarkers for FMD viral infection.

Newcastle disease (ND) remains one of the most harmful poultry diseases that threaten the poultry industry producers all over the world, thus the present work was planned to investigate the hematological, biochemical, and pathological changes in vaccinated and non-vaccinated broiler chickens naturally infected with ND. The study was conducted on 45 broiler chickens, 35-days-old, from a private farm in Damietta governorate and used in this work, 15 chickens were clinically healthy (Group I), 30 chickens with ND symptoms divided into 15 non-vaccinated (Group II) and the other 15 chickens (Group III) were vaccinated with La Sota strain of NDV with a titre of 106.5 EID50. The disease was diagnosed by hem agglutination test as ND. Blood and tissue samples were collected for clinical-pathological and histopathological examination. The infected broiler chickens showed cyanosis, nasal discharge, edema of eyelid and white pasty diarrhea with nervous manifestations. Furthermore, microcytic hypochromic anemia with leukocytosis was observed. Biochemical studies revealed a significant decrease in serum total proteins, albumin and A/G ratio, with significant increases in serum activities of aspartate aminotransferase, creatinine, and uric acid and glucose concentration in addition to several histological alterations were significantly seen in brain, intestine, liver and kidney of the infected birds. All these disturbances were less severe in the vaccinated group than the non-vaccinated one. In conclusion, La Sota vaccine can increase the bird resistant against Newcastle disease virus induced blood disorders and hepatic-renal insufficiency in broiler chickens.