Renata Muchacka

Effect of Organic Production System on the Performance and Meat Quality of Two Purebred Slow-Growing Chicken Breeds

Abstract The objective of the study was to compare the effect of organic and conventional rearing systems on the productivity and meat quality of Yellowleg Partridge (Ż-33) and Rhode Island Red (R-11) chickens. A total of 492 sexed experimental birds (Gallus domesticus) were assigned to four groups. In groups I-C and III-C, the Ż-33 and R-11 chickens were reared under intensive conditions following conventional farming principles. In groups II-O and IV-O, the Ż-33 and R-11 chickens were kept according to organic farming principles. Body weight, feed conversion (kg/kg gain) and mortality were recorded throughout the study. On day 140 of rearing, the native breed chickens were subjected to simplified slaughter analysis, and meat pH, muscle colour, water holding capacity and chilling loss were determined. The meat samples were analysed for the chemical composition and profile of fatty acids, and the peroxidizability index (PI), thrombogenic index (TI) and atherogenicity index (AI) were calculated. The organically raised chickens were characterised by higher body weight (P≤0.01), better feed conversion (P≤0.01) and more favourable fatty acid profile of the muscles compared to the conventionally reared birds. Under organic conditions, the R-11 chickens showed better productivity but slightly poorer fatty acid profile of the muscles compared to the Ż-11 chickens.

Characteristics of Organic Livestock Farms in Poland in 2009–2011

Abstract This study was designed to provide a thorough characterization of individual organic farms with certified animal production in Poland in the years 2009-2011. The study consisted of a direct survey using a standard questionnaire. Monitoring of organic farms showed that organic animal production in Poland is still developing. The most common type is backyard subsistence farming for own consumption and possibly for direct sales at local markets. Organic farms with an area exceeding 20 ha tend to orient themselves towards specialized production of cattle, sheep or pigs, while medium-sized organic farms specialize in pork and organic lamb production. However, the observed specialization in livestock production on organic farms is still relatively small.