Hatem M. Eltahan

• MSC PhD
• Agriculture engenering at Animal Production Research Institute (APRI)

This study investigated how sucralose influenced rabbit intestine and caecal microbial activity, blood parameters, growth performance, carcass characteristics, and digestibility. In total, 160 5-week-old rabbits from the APRI line weighing 563.29 gm were randomly assigned to four experimental groups with four replicates—5 males and 5 females in eac...

Global warming and climate changes have a detrimental impact on poultry production, causing substantial economic losses. This study investigated the effects of incorporating dietary betaine (BT) and organic minerals (OMs) on broilers’ performance as well as their potential to mitigate the negative impacts of heat stress (HS). Six hundred 1-day-old...

To investigate the effect of bee venom (BV) as a natural growth promotor on growing rabbits as an alternative to antibiotics, sixty 35-day-old Californian male rabbits with an average body weight of 584 ± 9 gm were randomly divided into five equal groups as follows: The 2nd group received drinking water supplied with 10 mg Oxytetracycline (OXT), wh...

The study examined how adding phytase to nonphytate phosphorus (NPP) diets affected performance, egg quality, reproductive hormones, and plasma biochemical indices in 73- to 80-wk-old laying hens. Six treatments with 5 replicates of 18 Hy-Line brown laying hens each were randomly assigned. Three isonitrogenous, isocaloric diets containing consisten...

This study aimed to investigate the effects of cold drinking water on cellular and humoral immunity in heat-exposed laying hens. One hundred and eight laying hens at 19 weeks old were placed into three treatments with six replicates of six hens in each group as follows: (1) hens were provided with normal drinking water (NW) under the control of the...

We examined the effects of oral administration of L-citrulline (L-Cit) on plasma met�abolic hormones and biochemical profile in broilers. Food intake, water intake, and body temperature were also analyzed. After dual oral administration (20 mmol/ head/administration) of L-Cit, broilers were exposed to a high ambient temperature (HT; 30 � 1�C) chamb...

Catalytic and physicochemical properties of microbial phytase sources may differ, affecting phosphorus (P) release and subsequently the productive and reproductive performance of layers. The current study aimed to evaluate the impact of bacterial and fungal phytase sources on layer productivity, egg production, biochemical blood indices, and reprod...

Increased average air temperatures and more frequent and prolonged periods of high ambient temperature (HT) associated with global warming will increasingly affect worldwide poultry production. It is thus important to understand how HT impacts poultry physiology and to identify novel approaches to facilitate improved adaptation and thereby maximize...

Oral administration of sucralose has been reported to stimulate food intake through inducing hypothalamic neuropeptide Y (NPY) in mice and fruit flies. However, the underlying mechanisms of action of sucralose in hypothermia and NPY and monoamine regulation remain unknown. The aim of the present study was to investigate central effects of sucralose...

Oral administration of L-citrulline (L-Cit) caused hypothermia, but L-Cit is not recommended in poultry diets in Japan. Watermelon is a natural source of L-Cit. The objective of this study is to examine the effect of watermelon waste, i.e., watermelon rind (WR) on the body temperature and plasma free amino acids of chicks. In Experiment 1, 14-day-o...

Heat stress is an issue of rising concern across the globe. Recently, we found that mRNA expression of gonadotropin-inhibitory hormone (GnIH), an orexigenic neuropeptide, was increased in the heat-exposed chick brain when food intake was reduced. The aim of the current study was to examine mRNA expression of GnIH and of the glucocorticoid receptors...

Heat stress is an increasing concern in poultry industry as it can cause a rise in the body temperature of chickens. Recently, we reported that L-citrulline (L-Cit) is a potential hypothermic agent that could improve thermotolerance in chicks. However, synthetic L-Cit has not yet been approved for inclusion in animal diets. L-Cit was first isolated...

Exposure of chicks to a high ambient temperature (HT) has previously been shown to increase neuropeptide Y (NPY) mRNA expression in the brain. Furthermore , it was found that NPY has anti-stress functions in heat-exposed fasted chicks. The aim of the study was to reveal the role of central administration of NPY on thermotolerance ability and the in...

Thermal manipulation declined embryonic brain and liver concentrations of leucine (Leu). L-Leu in ovo injection afforded thermotolerance in male broiler chicks. This study aimed to examine the role of in ovo injection of L-Leu in metabolic functions, and differences between male and female broiler chicks in thermotolerance. L-Leu injection was perf...

The present study aimed to investigate the growth performance of growing New Zealand White (NZW) rabbits fed with low protein diets containing irradiated or un-irradiated tomato pomace (TP). Eighty unsexed NZW rabbits were divided randomly into four experimental groups of 20 rabbits of 5 weeks age with an average live body weight of (603.6 ± 10gm)....