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Effects of yeast (Saccharomyces cerevisiae) feed supplement on growth performances in "Queue Fine de l’Ouest" lambs

O. Maamouri 1 *

B. Jemmali 2

I. Badri 2

H. Selmi 3

H. Rouissi 2


1 Regional Center of Agricultural Research Sidi Bouzid, 9100. Sidi Bouzid. Tunisia

2 Laboratory of Improvement and Integrated Development of Animal Productivity and Food Resources, Higher School of Agriculture of Mateur, University of Carthage, Tunisia.

3 Regional Filed crops Research Center Beja, Tunisia


Abstract - This study aims explore the effects of yeast Saccharomyces cerevisiae feed supplement on lambs growth and their feed intake. For this purpose, 14 lambs aged of 148 days were used during 9 weeks and allocated to 2 groups according to body weight and age. Lambs receiving a basal diet of oat hay ad libitum supplemented with whole grain barley (400g) and concentrate (400g). The control group (C) received oat hay ad libitum, whole grain barley (400g) and concentrate (400g). The second group (Y) received the same feeds than (C) group plus a dose of 1,5g/lamb/day of yeast Actisaf ® Sc 47. The ration was distributed twice a day at fixed times. Animals of two groups had free access to water.

This study showed that the average amount of oat hay voluntarily ingested was 147,1 and 148,7 g DM/lamb/day, for (C) group and (Y) one respectively in the first week of control. Feed intake continues to increase slightly until the 5th week and reached a maximum around the 9th week of trial (374,6 vs. 439,9 g DM/lamb/day for (C) group and (Y) respectively). Weight of lambs has evolved during trial period, it increased from 22,5 kg to 30,5 kg for (C) group and 22,3 kg to 34,5 kg for (Y) group with a notable superiority for (Y) group in comparison with (C) one. For the daily gain, the respective averages are 145 g/day and 223 g/day for lambs of (C) group and (Y) one. The statistical analysis shows that there are significant differences for daily gain (g/day) within 5th, 6th, 8th week of growth trial, and a significant difference of daily gain throughout growth trial (1th; 8th week). Feed conversion decreased notably for lambs of (Y) in comparison with group and (C) one.


Keywords: lambs / concentrate / Saccharomyces cerevisiae yeast / intake / growth.


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Calcium Sulfate and Calcium Carbonate Simple and Mixed Precipitations

Y. Zarga*

H. Elfil

H. Ben Boubaker


LabTEN – Water Technologies Research Center, Technopole of Borj-Cedria, Tunisia


Abstract - This study focuses on calcium sulfate (gypsum) and calcium carbonate (CaCO3) simple and mixed precipitations. These forms of scaling are still an issue in several industrial applications such as cooling towers and water desalination, either by thermal-based or membrane-based processes. CaCO3 precipitation has been studied by the degassing method while the gypsum simple and mixed precipitations have been studied by the double decomposition method, and by following 4 parameters simultaneously, namely: pH and total alkalinity serve to detect the CaCO3 precipitation, calcium ion concentration allows following the gypsum germination, and the quartz crystal microbalance (QCM) response gives information about the salts seeding, especially gypsum. A kinetic study of CaCO3 and CaSO4∙2H2O mixed precipitation resulted in a different form to that of the simple precipitation. Indeed, even though the pH remains the key parameter to detect CaCO3 precipitation either under simple or mixed precipitation forms, as the QCM response was found not to be a good parameter to detect the CaCO3 germination in a mixed system, especially when it precipitates after calcium sulfate, the QCM response remains a specific parameter to gypsum crystals because even after the appearance of the first CaCO3 crystals, gypsum germination continues with faster kinetics. Gypsum germination time in co-precipitation is higher than that corresponding to the simple precipitation (CaSO4-H2O system) because of the competition between the different co-precipitating ions.


Key words: Scaling / Simple and mixed precipitations / Germination / Degassing / Double decomposition.


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Estimation of direct and maternal variance components of lamb weights at 90 days

W. Mâaoui*

A. Ben Gara

B. Rekik


Laboratory of improvement and integrated development of animal productivity and food resources, Higher School of Agriculture of Mateur, University of Carthage, Tunisia


Abstract - Weights at 90 days were simulated for Barbarine lambs using various data and pedigree structures. The herd size, number of years and ram pedigree information were modified to cover probable structures of field data: Herds included between 100 and 2000 animals over 4 to 20 years with complete or missing ram information. Direct, maternal, permanent and residual variance components were estimated by Bayesian analysis via Gibbs sampling applied to an animal model that included the fixed effects of year and month of lambing, litter size, the age of the dam and sex of the lamb. A total of 30000 samples were generated. A burn-in period of 2000 rounds was used and then one out of 10 iterations was kept for subsequent analysis. Posterior means of direct and maternal variance effects ranged from 0,83 to 3,86 and from 2,30 to 4,34, respectively. Heritability estimates, in the same order, were between 0,06 and 0,29 and 0,16 and 0,28. In manner similar to direct estimates, maternal component estimates were closer to input parameters (3, 3,5, 9 and 7 for direct, maternal, permanent and residual variance, respectively) for increased herd sizes and number of years and complete ram pedigree.


Key words: Barbarine / growth / maternal effect / Sheep breed.


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Effect of whole fenugreek seed before and after its maceration in water on hens’laying performance and egg cholesterol profile.

H. AbdouLi 1*

B. Omri 1

L. Tayachi 1


1Laboratory of improvement and integrated development of animal productivity and food resources, Higher School of Agriculture of Mateur, University of Carthage, Tunisia


Abstract - Given the hypocholesterolemic property of fenugreek seed, the purpose of this study was to evaluate the effect of whole fenugreek seeds (WFS) and its water and hexane insoluble fraction (WHIFWFS) given to layers on laying performance and egg quality. Thirty, 69-week-old, Lohmann White laying hens (10 hens/treatment) were fed for 41 days 100 g/d of a basal diet (control), basal diet +1.75 g WHIFWFS and basal diet + 2 g WFS. Hen-day laying rate was not affected (P>0.05) by fenugreek addition. Mean weight of eggs laid throughout the whole experimental period was higher (P<0.05) for WHIFWFS (64.79 g) than for the control (62.23 g) and WFS (62.41 g). However, this difference was without consequence on mean egg mass and feed efficiency which were not affected (P> 0.05) by fenugreek addition. Physical characteristics of eggs laid on days 39-41, except shell weight which was the highest (P<0.05) for WHIFWFS, were not affected (P>0.05) by fenugreek addition. Fenugreek supplementation did not affect (P>0.05) triglyceride, total cholesterol and HDL cholesterol per g yolk and per egg. It was concluded that whole fenugreek seed given to Lohmann White laying hens had no effect on their laying performance and egg physical quality traits and cholesterol profile.


Key words: Fenugreek seed / egg cholesterol / laying hens


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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