background: searching for factors that reduce the adverse effect of heat stress (hs) on broiler performance has particular importance. objectives: the present study was designed to investigate the influence of dietary melatonin, gamma-amino butyric acid (gaba) and dark period on growth performance, carcass characteristics and blood parameters of broiler under heat stress condition. methods: a t...

background: following the ban on the use of growth stimulant antibiotics in many countries, interest has arisen in finding  a suitable alternative for antibiotics in poultry production. objectives: the aim of this study was to investigate the effect of supplementation of two levels of nano-copper (0 and 100 mg/kg) and two levels of mannan oligosaccharide (0 or 1 g/kg) as natural growth stimulan...

Effect of Grain Type and Phytase Enzyme on Growth Performance, Cecum Microbial Population, Carcass Bone Characteristics Broiler Chickens

Measuring chick quality has been a difficult issue since the beginning of the poultry industry. There have been many attempts over the decades to evaluate chick quality in the hatchery to predict future performance in the broiler house. One can examine chicks in the hatchery and enumerate conditions such as the incidences of red hocks, open navels, string navels, and other abnormalities. In mos...

An experimental study in 180 day-old broiler chicks was conducted to evaluate efficacy of herbal liver tonic & growth promoter products on overall growth, performance and carcass quality parameters. Day old chicks were randomly divided into three groups, control group I was given no treatment while group II & III were administered herbal liver tonic & growth promoter products Superliv DS & Xliv...

the aim of the present study was to assess whether near infrared reflectance spectroscopy (nirs) and regression equations are the practical and accurate approach of nutritional assessment of common feedstuffs. therefore two experiments were conducted to study the effect of amino acid determination methods on broiler performance. in experiment i, two hundred thirty four male ross broiler chicks ...

OBJECTIVE The study was conducted to evaluate the effects of different methionine (Met) sources on production performance, reproduction performance, egg quality and serum biochemical indices in broiler breeders. METHODS After receiving a basal diet (containing 0.25% Met) for a 2-wk pretreatment period, a total of 360 39-wk-old Lingnan yellow broiler breeders were randomly allocated to four tr...

Effect of Qualitative Feed Restriction and Duration its Application on Performance, Blood Biochemical Parameters, Carcass Characteristics Broiler Chickens