h. moravej

This study was conducted to determine the effect of different levels of omega-3 and omega-6 calcium fat powders on performance, hatchability, serum lipids, abdominal fat, and ovarian follicle count in Ross-308 broiler breeder hens (65 week-old). The experiment was performed in a repeated measurement design with 84 hens and 28 roosters with seven treatments (four replicates) during three months. The experimental groups included control group (no fat powder), 1.5 and 3% of animal omega-3 calcium fat powder of fish oil origin (ω3F), plant omega-3 calcium fat powder of linseed oil origin (ω3L), and omega-6 calcium fat powder of soybean oil origin (ω6S). The results showed that the highest average of HDEP was belonged to the experimental groups containing 1.5% ω3F (61.98), and ω3L (60.25) without significant difference with together (P> 0.05). However, among experimental groups, the highest egg mass (44.78 g/h/d) was obtained from consumption of 1.5% ω3F (P<0.05). The highest concentrations of triglycerides (1806.8 mg/dL), cholesterol (206.25 mg/dL), and low density lipoprotein (244/25 mg/dL) of serum were belonged to control group that was significantly different from other experimental groups (P<0.05). The percentage of hatchability of fertile eggs was improved by consuming diets containing fat powder, except 3% ω6S, when compared to control (P<0.05). Overall, considering the production performance, hatchability and economic explanation of diets, it seems that addition of omega-3 calcium fat powder at the level of 1.5% (ω3F and ω3L) is affordable and can have a positive effect on old broiler breeder hens.

This experiment was conducted to evaluate the performance and carcass characteristics of broiler chickens which were fed with wheat and barley based diets with different levels of vitamin premix in battery cage system from 29-42 days. A total of 112 male broilers (Ross 308) were allocated to 7 treatment groups, with 4 replicates per treatment group and 4 birds per replicate pen. The treatments were composed of 0, 33.33, 66.66 and 100 percent of vitamin premix (according to the recommendation of vitamin premix Producer Company) which used from 29 to 42 days; moreover, three treatments were composed of 0, 33.33, 66.66 and 100 percent of vitamin premix, which were eliminate from the diets at age 36-42 day. At the 35 and 42 days of age live weight and feed intake of each replicate were measured and the average of feed intake, body weight gain and feed conversion ratio were calculated. In two periods of 35 and 42 days after the slaughter, carcass yield, percentage of thigh and breast meat, abdominal fat and liver were measured. The results showed that birds fed with different levels of vitamins had no significant differences (P>0.05) on productive performance and carcass characteristic in the period of 29-35 days of age in finisher period, but birds which were fed on diets without vitamin premix (zero level) in the period of 36-42 days of age had significant difference with other levels (P>0.05). Therefore, it seems according to the lower level of vitamin premix (33.33%) there is the possibility of reduction of its level during finisher rearing of broiler chickens in battery cage system.

Two experiments were carried out in order to comparison of the effect of different levels of vitamin premix in two raising systems of floor and cage on performance and leg bone characteristics of broiler chickens which were fed with adjusted diet base on wheat and barley during 29 to 42 days. The treatments were composed of 0, 33.33, 66.66 and 100 percent of vitamin premix (according to the recommendation of vitamin premix Producer Company) which used from 29 to 42 days. Experiment in floor was carried out by using 288 male broiler chickens (Ross 308) with 4 treatments and 4 replicates in a completely randomized design in floor system. Experiment in cage battery system was carried out by using 80 male broiler chickens with 4 treatments and 4 replicates in raising cage. Feed intake and body weight gain of each replicate were calculated during two weeks of the experiment. During these two weeks, in experiment in floor, two broiler chickens were measured and in experiment in cage battery system one broiler chickens slaughtered and breast, thigh, percentage of abdominal fat and liver were measured. After slaughtered, right leg of each bird was used for determine ash, calcium, phosphorus and strength. The results of the experiment in floor showed that vitamin premix withdrawal at 29 days of age did not impair carcass characteristics and leg bone characteristics during the final rearing period. The results of battery cage system showed that withdrawal of vitamin premix from the diet of experimental birds; were induced negative effect on productive performance, weights of thigh, and breast and leg bone characteristics during 36-42 day of ages. Therefore, it seems that there is the possibility of vitamin premix levels reduction up to the approximate 33% level in finisher period while in the floor system; it is possible to withdraw vitamin supplements in broilers’ finisher diets and in this way the costs of poultry industry will reduce.