Hossam H. Azzaz

National Research Center, Egypt | NRC · Department of Dairy Sciences

The associative effects of Chlorella vulgaris microalgae and copper (Cu) supplementation on feed utilisation and lactational performance in goats were evaluated. Thirty-two lactating Boer goats (34.8 ± 1.7 kg body weight) were used to evaluate the supplementation of C. vulgaris microalgae at 10 g/day (AL treatment), 9 mg of Cu/kg diet (CU treatment...

Abstract: The experiment was conducted to study the effects of supplementing a cellulase enzymes cocktail to lactating buffaloes’ diet, on the nutrient intake, nutrient digestibility, and milk production performance and composition. Twenty-four lactating Egyptian buffaloes were assigned into one of the following treatments: CON—control consisted of...

The aim of the present experiment was to evaluate the effect of feeding a newly produced bacteriocin-like substance (BLS) as a replacement for monensin in the diets of lactating ewes. In Experiment 1, the effects of BLS or monensin at 0.5, 1, 1.5, and 2 g/kg diet on in vitro ruminal fermentation were compared. In Experiment 2, 30 multiparous Barki...

Production of new types of probiotics for animal nutrition mainly depends on the appropriate bacterial strain and efficient substrate. Therefore, this study aimed to evaluate the impact of two probiotic strains containing 1.2 3 10 8 (CFU/g), produced on permeate media on performance responses of Rahmani ewes. Thirty early lactating ewes (about 2-3...

This study compared the effects of feeding a new strain of Saccharomyces cerevisiae HSA2020 with a commercial strain on in vitro rumen fermentation and production performance of dairy cows. Permeate was used as a substrate for the laboratory production of the new strain of S. cerevisiae after the hydrolysis by β–galactosidase (5000 µ/mL at 37°C). T...

The use of mineral nanoparticles as replacer for traditional formulas of mineral dietary supplements for ruminants is a new approach. The main aim of this study was to evaluate effects of dietary Cr nanoparticles (Cr 2 O 3-NPs) supplementation at different levels (0.3, 0.6, 0.9, 1.2, 2.1 and 3 mg//Kg DM) on feed fermentation and degradation in the...

In ruminants, selenium is an essential trace element and has a variety of biological functions, but its importance for rumen microbes is still not fully understood. The goal of the current study is to investigate the effects of prepared selenium nanoparticles (Se-NPs) at various concentrations (0.2, 0.4, 0.6, 1, 2, and 3 mg of Se-NPs/Kg DM for T1,...

The aim of the present study was to compare the effect of feeding a newly produced bacteriocin like substance from Lactococcus lactis ssp. lactis (PNP) with a commercially produced (NISEEN ®-S; CNP) in lactating Rahmani ewe diets. In Experiment 1, the effects of four levels (500, 1000, 1500, and 2000 unit/kg substrate, dry matter (DM) basis) of bot...

The objective of this study was to determine the ability of an isolated strain (EGY_NRC1) or commercial (NCIMB 11181) Enterococcus faecium as a probiotic for lactating cows. Two experiments were conducted: In Experiment 1, the effects of three levels (1, 2, and 3 g/kg diet, DM basis) of isolated and commercial E. faecium on in vitro ruminal ferment...

Oil in water nanoemulsion represents a new and unstudied form of oil supplementation to the ruminant diet; that is why the aim was to evaluate the potential of nanoemulsified corn oil in dairy goats’ diets on milk productivity and fatty acid proportion. Twenty-four lactating Zaraibi goats in early lactation were randomly allocated to the following...

The supplementation with herbal and medicinal plants to animals showed positive effects on feed digestion, performance and animal’s health. Fifteen multiparous Egyptian buffaloes (537 ± 18.1 kg body weight), 7 days after parturition, were randomly assigned to 3 treatments in a quintupled 3 × 3 Latin square design in a 63-day experiment. Each experi...

Olive tree by-products (OTB) were examined to be used as an alternative feed for ruminants after improving their chemical composition through urea and Phanerochaete chrysosporium treatments. Twenty eight lactating Barki ewes were randomly assigned to four groups ( seven animals each) using the complete random design. Ewes were fed 70% concentrate f...

The experiment was conducted to study the effects of supplementing a cellulase enzymes cocktail to lactating buffaloes’ diet, on the nutrient intake, nutrient digestibility, and milk production performance and composition. Twenty-four lactating Egyptian buffaloes were assigned into one of the following treatments: CON—control consisted of a total m...

Pectinase hydrolyses pectin and increases the utilization of agriculture byproducts as feeds for ruminants. A newly developed pectinase from Aspergillus terreus was compared with a commercially available pectinase at 600 IU/kg feed on feed utilization and lactational performance of Damascus goat fed orange pulp and sugar beet pulp based diet (i.e.,...

A newly developed pectinase from Aspergillus terreus was compared with a commercially available pectinase at 600 IU/kg feed. Thirty (one-week postpartum) Damascus goats stratified by previous milk production, body weight and parity were divided into three experimental treatments. Does were fed a basal diet containing concentrates, orange silage, su...

bstract | The present study was performed to evaluate the effects of pectinase enzymes inclusion in the ration on lactating buffaloes performance, nutrient digestibility, blood chemistry and yield and composition of milk. The experiment conducted twelve lactating Egyptian buffaloes having their 3rd to 5th lactation and weighed 480± 8 kg in average....

Inclusion of tannase enzyme, in tannin rich diets of lactating animals can be explored as a strategy to overcome the negative effects of tannins on feed utilization and lactational performance. The present study aimed to compare the effect of replacing commercially available exogenous tannase with a newly developed tannase, produced from Aspergillu...

Background and Objective: Dairy wastes are sources of environmental pollution and efficiently used for production of added value products is an important issue. The aim of this study was to use milk permeate for production of Saccharomyces cerevesia biomass, as baker's and feed yeast. Materials and Methods: The fermentation process was conducted wi...

Pectinase production for improving buffalo's diets digestion is the main objective of this work. Effects of fungal strains and different cultivation conditions on pectinase production have been studied. In vitro batch culture technique was used for investigate impact of the produced pectinase compared with commercial pectinase (SMIZYME ®) on rumen...

Background and Objectives: Pectinase as a fibrolytic enzyme is a main tool for effective use of pectin rich agro-residues as alternative feed resources. Production of pectinase by Aspergillus terreus on medium of sugar beet pulp to be used as a feed supplement for dairy animals was the main objective of this study. Materials and Methods: Impact of...

Background and Objectives: The search for cheap-safe tools for promoting farm animal productivity is the main concern of the animal nutritionists’ nowadays. The main objective of this study was to evaluate impact of cellulase new formula for promoting performance of lactating Baladi goats. Materials and Methods: Eighteen early lactating Baladi goat...

Pectinase production for improving buffalo's diets digestion is the main objective of this work. Effects of fungal strains and different cultivation conditions on pectinase production have been studied. In vitro batch culture technique was used for investigate impact of the produced pectinase compared with commercial pectinase (SMIZYME ®) on rumen...

Background and Objective: Cellulase as a fibrolytic enzyme is a highly effective tool for agricultural waste treatments. Production of cellulase enzyme on medium of agricultural wastes by Fusarium graminearum to be used in ruminant feeding was the main objective of this study. Materials and Methods: Impact of initial pH of growth medium, different...

Background and Objectives: Huge amounts of permeate produced from ultrafiltration of milk for cheese processing were wasted and represent a serious environmental pollution problem. Utilization of such permeates for production of added value products as yeast biomass or baker's yeast would be profitable from the economical and the environmental poin...

Background and Objective: Cellulases enzymes are widely be interested due to its capability to degrade lignocellulosic materials. The current study was concerning on investigating different factors of cellulase production from fungal sources by using agricultural wastes and studying its impacts on ruminal digestion and fermentation. Materials and M...

Background and Objectives: Enhancing poor quality roughages by biological treatments has interested for many researches in last years. So, in the current study was carried out to production of tannase enzyme by Aspergillus terreus and its impact on ruminal fermentation, degradability and gas production were evaluated through in vitro trials. Materi...

olive trees by-products (OTB) has high fiber and low protein content that could limit its use for feeding animals. This work aimed to investigate the effect of replacement of berseem hay in the diet of lactating Barki ewes by OTB treated with increasing levels of urea on Animal’s nutrient digestibility, milk yield and milk composition. Thirty-five...

Xanthan gum is a microbial product and important polysaccharide of high commercial value. It has many industrial applications, in food, chemical, pharmaceutical, textile and oil industries. This review summaries deferent items of xanthan gum production, comprising the producing bacterium Xanthomonas campestris, substrates used, especially the recen...

Background and Objectives: Supplementing diets of dairy animals with phytase and xylanase can enhance phosphorus availability and fiber degradation in the rumen and positively affect animal’s health and productivity. In vitro and in vivo trials have been conducted to define the optimal addition level of xylanase and phytase to lactating Baldi goat’...

Background and Objective: Utilization of date seeds (processed date by product) as a feedstuff in diets of farm animals are being in spotlight, this study were carried out to investigate the effect of feeding diets contain cracked date seed with or without fibrolytic enzyme, versus control diet using Egyptian buffaloes. Materials and Methods: Fifte...

Propionibacteria are natural inhabitants of the rumen that make up 1.4% of ruminal microflora and produce propionate, a major precursor for glucose production by hepatic gluconeogenesis. Several mechanisms have been suggested for the mode of action of direct-fed bacteria in ruminants include stimulation of desirable microbial growth in the rumen, a...

The aim of this study was to evaluate the effect of different level of probiotic supplementation to ruminant rations, using in-vitro batch culture technique to determine degradation and fermentation parameters. In vitro experimental ration was formulated, the ration consisted of 40% alfalfa hay and 60% concentrate feed mixture.

Growing of public concerns towards use of antibiotics in animal feeding paved the way for probiotics utilization enlargement. Lactic acid bacteria (LAB) as a probiotic could improve dairy animal’s performance through prevention of ruminal acidosis; stimulate digestive enzymes production and secretion and stimulate animal’s immune system. The action...

Evaluate impact of the marjoram and parsley by-products on rumen fermentation characteristics (in vitro) and the productive performance of early lactating buffaloes (in vivo) are the main objectives of this study. Two in vitro experiments were conducted to evaluate the effect of partial and full substitution of control ration's rice straw by marjor...

Background and Objective: Olive trees by products (OTB) as agro-waste not efficiently used and left it without treatment may cause serious economical, social and environmental problems. Biological treatments for such wastes can upgrade their nutritive values to be used as alternative feeds for ruminants. Investigate if their synergism between T. vi...

Background and Objective: Feather wastes are the most abundant keratinous material in the nature and its accumulation causes multiple environmental problems. Nutritive value upgrading of such wastes through biological treatments may provide ruminant's rations with high quality and cost effective source of protein. Therefore, the main objective of t...

he present study was carried out at farm and laboratory of Animal Production Department-Faculty of Agriculture, Fayoum University, Egypt. Fibrolytic enzymes were evaluated throughexperiments conducted by using nine of lactating baladi goats after 20 days of parturition and divided into three groups, three animals per each group. The first group was...

Background and Objectives: Most utilized grains in livestock feeding in Egypt are imported from abroad, therefore searching for alternative feed ingredients to replace of high cost feed grains is very important approach. This research aimed to investigate the effects of partial replacement of corn grains by Powdered Date Seeds (PDS) or PDS+fibrolyt...

Objective: Fungal cellulase production under the optimum conditions and investigates the impact of the produced cellulase on degradation of goat’s rations compared with commercial cellulase source. Materials and Methods: Asperigillus niger, Asperigillus flavus, Asperigillus fugimatus, Trichoderma viride and Penicillium chrysogenum were separately g...

Objective: This study was designed to evaluate impact of adding M. oleifera and E. purpurea dried leaves to diets of Rhamani lactating ewes on their rumen fermentation characteristics, nutrients digestibility, blood parameters, milk yield, composition and its fatty acid profile. Materials and Methods: Fifteen Rhamani lactating ewes after 1 week of...

Improved ruminant's health and its productive performance has always remained a primary goal of researchers associated with the animal production sector. Microbial feed supplements as natural growth promoters might play an important role for enhancement of health and productive performance of ruminants through prevention of disease, enhancement of...

Ionophores are feed additives that alter rumen microbial populations through ion transfer across cell membranes. Although ionophores have been used widely in the ruminant's nutrition for improved feed efficiency and control of coccidiosis. Ionophores have been studied regarding several potential effects on ruminant animals, including influences on...

This study was conducted to investigate the effect of Aspergillus awamori (Tomoko) and ® Lactobacillus acidophilus (Veta-Zyme Plus) as microbial feed supplements on in vitro and in vivo feed ® nutrients digestibility, rumen fermentation characteristics, blood parameters, milk yield and milk composition of lactating Nubian goats. In the in vitro tri...

This study was conducted to study the effect of yeast culture (Saccharomyces cerevisiae) supplementation either alone or in combination with Propionibacterium freudenreichii strain P169 on nutrient digestibility coefficients, blood metabolites, milk yield and milk composition of mild lactating buffaloes. Fifteen lactating buffaloes, 2 months after...

Probiotics have been shown to improve anaerobiosis, stabilise pH and supply nutrients to microbes in rumen microenvironment. In this concern, the Yeast Saccharomyces cerevisiae (Y) or Yeast + propionibacteria (Y+P) were used as ration additives for lactating buffaloes. Their effects on nutrients digestibility, milk yield and composition were studie...

The production of pectinase under the optimum fermentation conditions was studied. Asperigillus niger was grown as stand cultures in 1000ml conical flasks containing 100 ml beet pulp powder medium for screening its ability for utilizing sugar beet pulp as main carbon source for pectinase production. The maximum production of pectinase by A.niger wa...

The current study aimed to produce pectinase to be involved in rations of lactating buffaloes. The maximum production of pectinase by A.niger was achieved at16% sugar beet pulp concentration, inoculum size of 5%, 48 hr of incubation period, initial pH of growth medium 7.0, yeast extract as a nitrogen sources at a concentration of 0.33 g N/l. Two ex...

The production of cellulase under the optimum fermentation conditions was studied. Non toxic Asperigillus flavus NRRL 5521 was grown as stand cultures in 500ml conical flasks containing 50 ml cellulose powder medium (CPM) for screening its ability for utilizing agricultural wastes as a carbon sources for cellulase production. The maximum production...

Two experiments were carried out to evaluate the effects of fibrolytic enzymes supplementation on in vitro degradation of sugar beet pulp and in vivo nutrients digestibility, milk yield and its composition by mild-lactating buffaloes. In the in vitro experiment, dry matter and organic matter disappearance (IVDMD and IVOMD) were determined for sugar...

An in vitro study was conducted to evaluate the effect of cellulases addition to banana wastes on dry matter (IVDMD) and organic matter (IVOMD) disappearances. Laboratory produced cellulase (Asperozym) and a commercial cellulolytic enzyme source (Bacillozym) were added separately to banana wastes at 4 levels (0, 0.77, 1.54, 2.31and 3.08 Unit / kg...

The production of cellulase by Asperigillus niger, Fusarium oxysporum, Fusarium avenaceum and Cephalosporium acremonium was studied. These fungi were grown as stand cultures in 1000ml conical flasks containing cellulose powder medium for screening their ability for utilizing cellulose as main carbon source for cellulase production. A. niger was cho...

Pectinases are widely distributed in higher plants and microorganisms. They are today one of the upcoming enzymes of the commercial sector. It has been estimated that microbial pectinases account for 25% of the global food enzymes sales. Microbial pectinases can be produced from bacteria including actinomycetes, yeast and fungi. Aspergillus niger i...

Production of cellulase is of great significance in present day biotechnology. Cellulose biodegradation by cellulases, produced by numerous microorganisms is very important in several agricultural and waste treatment processes. The development of microbial strains, media composition and process control has including submerged fermentation and solid...