This study is based on the microbiological analysis of a common slaughterhouse by-product which is the rumen content, before and after treatment with HCl 1N, targeting its valorization in domestic animal feeding. A total of 24 rumen content samples were collected in pairs (two series) immediately after slaughter from 12 ruminants (cattle, sheep and goats). The first series was not treated with HCl (N0 = 12), while the second series was treated with HCl 1N (N1 = 12) to adjust its pH to about 2. Then all samples (series 1 and 2) were subject to a group of microbiological analyzes targeting identification and enumeration of total aerobic mesophilic flora; fecal and total coliforms; Clostridium perfringens; Staphylococcus aureus; Salmonella spp. as well as yeasts and molds. The results revealed that after lowering the pH to about 2, the 2nd series samples were considered of satisfactory quality, with reference to Algerian microbiological standards for livestock feeds. The reduction rates of germs in the 2nd series compared to the 1st series were as follows: total aerobic mesophilic flora (86.45%), total coliforms (96.43%), faecal coliforms (70.41). %), Clostridium perfringens (88.4%), yeast and mold (87.75%). The total absence of Staphylococcus aureus and Salmonella spp. was registered.
The aim of this study was to determine the effect on the production performances and carcass characteristics of local broiler chickens of replacing corn with cull dates from agri-food industries in oasis zones and of complementing this with rumen content extract from sheep abattoirs in the chickens’ feed rations. A total of 200 male and female day-old chicks of local stock, with an average weight of 25±2g, were divided randomly into 4 groups of 50 individuals, each group distinguished by the respective rate of substitution of corn by cull dates (0%, 20%, 30% and 40%) for a period of 48 days. Each group was divided into ten (10) cages of 5 subjects. The live weights after 48 days improved for all experimental groups, recording an increase of +162g (20%); +82g (30%) and +31g (40%). All of the characteristics remained unchanged for all groups with the exception of liver weight, which was lower in the experimental groups. Substituting until 40% of the corn by culls dates while adding 250 ml rumen content extract per kilogram of broiler feed increased the live weight and average daily gain compared to the control.
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