Scielo RSS http://www.scielo.br/rss.php?pid=1516-635X20200004&lang=en vol. 22 num. 4 lang. en http://www.scielo.br/img/en/fbpelogp.gif http://www.scielo.br http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000400300&lng=en&nrm=iso&tlng=en ABSTRACT The current study was conducted to develop the correlations between muscle fiber characteristics and meat quality attributes in the biceps femoris muscle of Arbor Acres (AA) and Yellow-feathered chicken (YFC). A total of fourty pure breed birds of AA (n=20) and YFC (n=20) were used in the experiment. After slaughtering at their respective market age of slaughtering: AA 40 d and YFC 120 d, samples were collected for meat quality attributes and myosin ATPase staining for fiber types analyses. Meat quality attributes and muscle fiber characteristics i-e; diameter, cross-sectional area (CSA) and density of AA were significantly different from the YFC (p<0.05). Type I fibers number percentage was significantly higher in YFC than AA, whereas CSA and fiber diameter were higher in AA (p<0.05). Negative correlations were obtained between lightness (L*) and type I fiber number percentage in AA (p<0.05). In YFC fiber number percentage, CSA and diameter of type IIA were negatively correlated with Warner-Bratzler Shear Force. Taken together, muscle fibers characteristics of AA and YFC differ in both breeds and have influenced the meat quality attributes. http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000400301&lng=en&nrm=iso&tlng=en ABSTRACT The present study aimed to evaluate the physical, chemical, and microbiological characteristics of 4 different poultry waste (dead birds, hatchery waste, offal, and a mixture of all) processed under two composting systems (bin and windrow). For this purpose, 12 compost bins and 12 windrow piles having different poultry waste were placed according to 2 × 4 factorial arrangements under Completely Randomized Design. Treatments consisted of 2 composting systems (bin and windrow) and 4 compost types (dead birds, offal, hatchery waste, and a mixture of all). The bins were comprised of 3 compartments (primary, secondary, and curing) and filled with dead birds, offal, hatchery waste, and a mixture of all. A similar procedure was adopted for the windrow composting system. Samples from each experimental material were collected and analyzed for proximate, amino acid, mineral, and bacterial analysis during the initial and curing phase. Results revealed that the highest crude protein (CP) content was found in dead birds while the lowest in hatchery waste compost processed under both composting systems. The highest temperature was recorded in dead bird’s compost during the primary phase while the minimum was found in hatchery waste. Microbial count of salmonella, mycoplasma, E. coli, and total plate count was found minimum in all types of compost. Macrominerals like Na, K, and P were the highest in dead birds while the lowest in hatchery waste compost. It can be concluded that dead birds compost processed through bin composting system had ideal proximate composition having minimal pathogenic load with superior amino acid and mineral profile as compared to other waste materials.