SALEM F M, DAYEM A A A E
(Animal and Poultry Nutrition Dep, Desert Research Center, Cairo, Egypt, Email: firstname.lastname@example.org) :
The effects of probiotic, prebiotic and synbiotic treatments on egg production and egg characteristics in brown nick hens during the last stage of production in winetr season
. Anim Sci Rep 2020, 13(2), 001 - 15.
The egg production trajectory of laying hens starts with the age of sexual maturity, and then ascends the peak, followed by regression in the last phase of production cycle in conjunction with quality deterioration making the enterprise commercially unsustainable to the breeder. It is more pronounced in winter season due to non-availability of required metabolic energy for maintenance of body temperature and sustenance of egg production. This study attempts to moderate it through administration of nutritional supplements, such as probiotic (Bio-plus2B?), and prebiotic (Techno Mos?) individually or in combination (synbiotic), focusing on the evaluation of (1) Hen-day egg production (%), egg weight (g) and daily egg mass (g); (2) Body weight (g) and body weight gain (g); (3) Feed intake (g/hen/day) and feed efficiency (feed intake/egg mass); (4) Egg quality in terms of egg weight (g), egg shape index (%), albumen (%), yolk (%), yolk/albumen ratio and haugh unit; (5) Shell quality in terms of shell weight (g), shell (%), shell thickness (mm), shell surface area (cm2), SWUSA (mg/cm2), and shell density (g/cm3); (6) Chemical composition of inner egg components (yolk & albumen) in terms of protein (%), fat (%) and GE (kcal/kg), and (7) Economic efficiency of feed (%) and net return (LE.) /kg eggs in eighty H&N Brown Nick laying hens in their last phase of production (65-74 weeks of age) under winter conditions in south Sinai desert of Egypt. The hens were randomly divided into 4 equal treatment groups with 10 replicates per treatment and 2 hens per replicate. These treatments were T1 (control), T2 (Probiotic: 1g Bio-plus2B? / 1kg diet), T3 (Prebiotic: 1g Techno Mos? / 1kg diet) and T4 (Synbiotic: 1g Bio-plus2B? along with 1g Techno Mos? / 1kg diet). The results indicated positive and significant (P<0.001) superiority of the experimental treatments particularly the probiotic (T2) treatment on hen-day egg production (%) and daily egg mass (g), over the control group. The improvement in feed efficiency in terms of feed intake / daily egg mass were significantly (P<0.001) higher in T2, T3 and T4 groups compared to the control (T1) indicating the advantage of supplements. The gross energy content (kcal/kg) of the inner egg components (yolk & albumen) for hens fed on probiotic containing diet (T2) was higher (P<0.05) than other three treatments (T1, T3, T4). Feed cost / kg eggs (LE. 12.67) was the lowest in probiotic (T2) group, while the net return / kg eggs (LE. 6.33) was the highest in this group (T2) compared to the other three groups (T1, T3, T4). It is concluded that dietary supplementation of probiotic (1g Bio-plus2B? / 1kg feed) excelled other treatments in enhancing egg production (%), egg mass (g), gross energy (GE) content (kcal / kg) of the inner egg components, feed efficiency (g), economic efficiency of feed (%) and net return (LE.)/1kg eggs in Brown Nick hens during the last stage of egg production in winter season.
3 illus, 6 tables, 54 ref