EFFECTS OF THE MARL ON THE PERFORMANCE, CUTTING YIELD AND MEAT QUALITY OF BROILER CHICKENS

Ouachem DERRADJI, Meredef AISSA, Kaboul NOURREDINE, Ahmed Gaid ZOHRA, Bakroune FATEN, Bensalem ADEL (ALGERIA)

 DOI: 10.7904/2068–4738–V(10)–71

Abstract. Following the economic and social pressures that have affected the poultry market, and after prohibition of the antibiotic growth promoter’s use, various natural additives have been proposed as an alternative for the poultry feed industry. Among these products, some clay types or derivatives were used in order to improve the digestive health and to optimize the growth performances. However, studies on the effects of clays on carcass cut up pieces yield and meat quality are unavailable. The aim of this trial is to study in broiler chickens during a rearing period of 56 days, the effects of 3% of marl addition on growth performance (slaughter weight and feed consumption ratio), the carcass and cut up pieces yield and meat quality through three indicators (abdominal fat, ultimate pH and water loss).Results showed firstly, that marl increases significantly the slaughter body weight (+ 8.3%, P=0.02) and provides an enhancement to the feed consumption ratio (–5%). Parallel, marl incorporation significantly improves the ready cook chicken yield (+ 9.13%, P<0.001), the breast meat (+11%, P=0.01) and reduce the abdominal fat (–11.8%, P=0.005). Furthermore, the effect of marl on the ultimate pH was not marked statistically (5.84 vs. 5.81) and water loss of breast muscle was less important at chickens fed with marl diet (2.04 vs. 2.40). Results of this trial suggest that marl can be used as a natural supply to promote an efficient chicken’s portion and to produce a technological meat quality adapted to further processing.

Keyword: Marl; Ultimate pH; Yield carcass; Growth performance; abdominal fat; Water loss; Broilers.

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BIODIESEL SOLID WASTE AND URBAN SLUDGE SEWAGE AS A SOIL AMENDMENT FOR THE SEEDLINGS PRODUCTION OF Eucalyptus Camaldulensis AND Morus Alba

Mariana Ferreira Rabelo FERNANDES, Regynaldo Arruda SAMPAMPAIO, Essaid BILAL, Jatnel Alonso LAZO Luiz Arnaldo FERNANDES (BRASIL, FRANCE, CUBA)

 DOI: 10.7904/2068–4738–V(10)–77

Abstract. We examine in this study a possibility of use the biodiesel industry waste as a source of nutrients for the production and development of seedlings seems like a very good option. We added the diatomaceous earth residues of Biodiesel with sludge from urban wastewater treatment or manure to stimulate the activity of soil bacterial. The Dickson Quality Index (DQI) values Eucalyptus Camaladulensis and Morus Alba seedlings growing in test substrates with sewage sludge and diatomaceous earth are all higher than the recommended minimum value of 0.2. The treatments with manure and diatomaceous earth do not meet the desired quality standard. The Eucalyptus Camaladulensis and Morus Alba seedlings have good growth in substrates containing sewage sludge and diatomaceous earth than only the commercial substrate. They can use up to 50% by volume of the substrate without compromising the seedlings quality with a reduction of cost of seedlings production.

Keyword: diatomaceous earth, Dickson Quality Index, Eucalyptus Camaladulensis and Morus Alba.

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