Nine thousand eight hundred, day old male Cobb X Cobb broilers were utilized in a 5x2 factorial design (10 replications/treatment) to determine the effects of five B-vitamins (riboflavin, pantothenic acid, niacin, B12 and folic acid) fortification levels (NRC, 2X, 4X, 8X and 16X NRC) and two levels of stress (low and moderate) on the performance of 0-49 day broilers. Diets were formulated to be...

The effects of environmental temperatures on live performance and carcass characteristics of broilers have been well documented [1, 2, 3]. In addition, Cahaner et al. [4] reported that nutritional requirements are affected by variations in ambient temperature. Amino acid requirements and digestibility in broilers and laying hens at high temperatures is known to vary from those that are raised a...

effect of early- feeding of broiler chicks immediately after hatch with gel or granule, on performance, the relative weight of yolk sac, liver, proventricolus, gizzard and the relative weight of weight and length of small intestine were investigated. analyzing the data by using sas statistical program including complete randomly design and duncan test, showed that post hatch feeding of gel, cou...

The genetic progress of broilers, since the beginning of the industrial poultry industry, has been indicated as one of the most impressive evolutions of animal production. To justify such changes, Sluis (1999) exemplified how much the broilers’ performance increased since 1978 and what are the predictions for 2008. As an example, in this period he demonstrated an improvement of 44% feed convers...

Two hundred and forty male Cobb broilers were used to study the reasons of causing ascites. The results showed that cold ambient temperature could induce ascites (33.89% vs. 2.50%) and significantly increase triiodothyronine (T3), but reduce thyroxine (T4) concentrations in plasma (p<0.05). The ascitic broilers had high concentrations of aldosterone and K , but low concentrations of T3 and T4 i...

A series of 4 experiments evaluated effects of mash conditioning temperature from a pellet mill or expander on performance of broilers fed pelleted diets containing spray-dried plasma (SDP). All experiments utilized Ross x Ross 308 male broilers randomly assigned to their respective treatments (6 or 10 broilers/pen and 8 or 10 pens/treatment). Treatments in Exp. 1 consisted of a control (0% SDP...

. light is an environmental factor, which has profound influences on broilers performance and frequently overlooked management practices. this study was conducted to compare the effects of different lighting programs on growth, carcass parts and economical performance using 320 one day–old broilers (arian 386) in completely randomized design with 4 treatments and 8 replicates per each treatment...