Abstract
Background:
Meat contamination occurs in various ways, the most important of which are live animals before slaughter and the slaughter process (de-hiding and evisceration). For this, many substances were used that have an antimicrobial effect and can disinfect the surfaces of the carcass and extend its shelf life.
Aim:
This research aimed to study the efficiency of using some organic acids (lactic acid and beefxide) to reduce the microbial load (indicator microorganisms) on the surfaces of beef carcasses and some edible organs in the Mosul slaughterhouse.
Methods:
Two hundred sixty-four swabs (192 carcasses + 72 edible organ samples) were collected over the course of three months from the Mosul slaughterhouse in Nineveh Governorate between September 2023, and December 2023 (132 treated with organic acids and 132 not treated). The petrifilm method was used to detect indicator microorganisms in the samples.
Results:
Our results showed that the contamination rate in beef carcasses with generic Escherichia coli, coliforms, total coliform counts, and Enterobacteriaceae before treatment was 0.81, 1.22, 1.48, and 1.38 mean log CFU/cm2, respectively. While the contamination rate in samples treated with organic acids for generic E. coli, coliforms, total coliform counts, and Enterobacteriaceae was -0.1, 0.31, 0.45, and 0.41 mean log CFU/cm2, respectively. Moreover, the level of contamination with indicator microorganisms in edible organs treated with organic acids was lower compared to untreated samples. Even though there was contamination with indicator microorganisms in the liver, heart, and kidney, there was no “significant” difference between them. Whereas there was no significant difference (P > 0.05) between lactic acid and beefxide solution in terms of reducing the rate of contamination of the indicator microorganisms in carcasses and the edible organs samples. Regarding the type of swabs used in the study, the results showed the effectiveness of sponge swabs, as the rate of microbial recovery (indicator microorganisms) was higher (P < 0.01) compared to cotton swabs.
Conclusion:
The study demonstrated the efficiency of using organic acids (lactic acid and beefxide solution) in reducing the microbial load to a level that does not cause diseases.

Key words: Indicator microorganisms, Organic acids, Beef, Slaughterhouse, Mosul