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Contribution to the study of the bacteriological quality of red offal from cattle in Tunisia

Contribution à l’étude de la qualité bactériologique des abats rouges de bovins en Tunisie

 

Jébali M.1, 4

Ben Rhayem M.2

Amairia S.4

Abdelaali H.3

Ettriqui A. 4

Oueslati W.4 

Zrelli S.4

 

1Division Contrôle Sanitaire et Vétérinaire - DGH Subsistances- DG Santé- Min. Déf.- Base Militaire Ksar Saïd, 2009, Tunis,

2Laboratoire Militaire d’Analyses Alimentaires- DG Santé- Min. Déf.- Base militaire Bâb Sâadoun, 1005, Tunis,

3Direction des Fermes Militaires - DG Santé - Min. Déf.- Base Militaire Ksar Saïd, 2009 Tunis,

4Service HIDAOA - Ecole Nationale de Médecine Vétérinaire, 2020, Sidi Thabet, Tunis.

 

 

Abstract - The present study relates to the evaluation of the bacteriological quality of red cattle’s offals at the slaughterhouse. Offals are a part of meat, which is defined as all edible parts of the animal after preparation at the slaughterhouse. The national and European legislative texts, currently valid, which established the microbiological criteria of food, have not retained bacteriological criteria for offals. The aim of this study is to evaluate the bacteriological quality of the cattle’s offal at the slaughterhouse. The results obtained could contribute to improving knowledge in order to propose microbiological criteria relating to these food categories. Our study involved a total of 921 samples of cattle’s offal (liver, kidney, spleen, lung), 601 of them were the subject of a search for Salmonella spp. and 320 were the subject of an enumeration of Total Aerobic Mesophilic Flora (T.A.M.F.), of Escherichia coli (E. coli), of Sulfito-Reducing Anaerobes (A.S.R.) and of coagulase-positive Staphylococcus. Our results revealed that the prevalence of Salmonella spp. (safety criterion) in offal is 5% (29/601). So, 95% of the samples have a satisfactory quality for this criterion. Serotypes of Salomnella spp. identified were S. Anatum (51.8%), S. Montevideo (13.8%), S. Zinzibar (13.8%) and S. Mbandaka (7%). The counts relating to the criteria of processes hygiene in offals showed that the average contents were 6.104 cfu/g for the T.M.A.M., 50 cfu / g for E. coli, 15 cfu / g for the A.S.R. and 1.56 cfu / g for coagulase positive Staphylococcus. The microbiological criteria proposed in our protocol could be adopted for cattle’s offals.

Key words: Cattle, offal, microbiological criteria.

Reproductive and dairy diagnosis of Tarentaise cow: A farm retrospective study

Diagnostic des performances de reproduction et laitière des vaches de race tarentaise : Etude rétrospective d’un élevage

 

Najjar A.1

Mighri A.1

Nahdi O.1

Ben Mustapha E.2

Hamrouni A.1

 

1Laboratoire des Ressources Génétiques Animales et Alimentaires, Institut National Agronomique de Tunisie, Université de Carthage, Tunisie.

2Ferme Ben Mustapha, Utique, Tunisie.

 

 

Abstract - This work consists of a retrospective study whose objective was to assess the reproductive and dairy performance of Tarentaise cows from a farm during four campaigns. Data from the 2014/2015 to 2017/2018 campaigns was taken from breeding documents from Ben Mustapha farm. The Fecundity and fertility parameters of the cows were determined according to the campaigns. The quantity of milk produced by lactation was determined using the annual balance sheets of AT4 type milk checks and carried out by the OEP. The results showed that the calving - calving, calving - 1st insemination and calving - fertilizing insemination intervals did not exceed the standards during the campaigns studied. However, the success rate at the 3rd insemination and more as well as the coital index were slightly higher than the standards. The quantities of milk produced by lactation and per day varied according to the years (p <0.01). The study showed that the fecundity parameters of the farm are acceptable while the fertility parameters are slightly higher to standards, which involve review of the method of estrus detection in cows. Variations in the quantity of milk remain dependent on climatic conditions and breeding management.

Key words: Tarentaise, dairy cows, reproduction, milk production, campaign.

Factors of variation of milk production of Tarentaise cows in lactation.

Facteurs de variation de la production laitière des vaches Tarentaises en lactation.

 

Najjar A.1

Mighri A.1

Nahdi O.1

Ben Mustapha E.2

Ben Said S.3

Hamrouni A.1 

Samti H.4

 

1Laboratoire des Ressources Génétiques Animales et Alimentaires, Institut National Agronomique de Tunisie, Université de Carthage, Tunisie.

2Ferme Ben Mustapha, Utique, Tunisie.

3Ecole Supérieure d’Agriculture du Kef.

4Institut National Agronomique de Tunisie, Université de Carthage, Tunisie.

 

 

Abstract - This work consisted to evaluate the factors influencing dairy and reproductive performances of lactating Tarentaise cows. The calving - 1st insemination (IVIA1), calving – fertilizing insemination (IVIF) intervals and the success rate at the 1st insemination were determined for post-partum cows. The daily milk production and its quality were followed in the group of animal during 4 months. The results showed that the IVIA1 and the IVIF were respectively 60 ± 4 days and 80 ± 9 days. The success rate at the first insemination was 63%. The daily milk production varied according to the cows, the sample date and the lactation stage (p<0.05). The fat rate varied according to cows and sample date (p<0.05). However, the protein matter rate varied only with cows (p<0.05). Besides, milk production was negatively correlated with the IVIF (r²=-0.0796). Therefore, we recommend strengthening the methods of overseeing reproductive events among post-partum cows like the date of the appearance of the first heat and then inseminating them at the appropriate time, in order to minimize their calving – fertilizing insemination interval and to ovoid negative affect on their milk production.

 

Key words: Tarentaise cow, variation factors, milk, quality, post-partum.

Copyright

This article is published under license to Journal of New Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

CC BY 4.0