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Effect of Diet Composition on Milk Composition and Fatty Acid Profile of Najdi Ewes

Effect of Diet Composition on Milk Composition and Fatty Acid Profile of Najdi Ewes

Abdulkareem Mohamed Matar1, Moez Ayadi1,2, Hassen Mohamed Sbihi3*, Imeddine Arbi Nehdi3, Mutassim Mohammad Abdelrahman1 and Riyadh Saleh Aljumaah1

1Department of Animal Production, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi -Arabia
2Département de Biotechnologie Animale, Institut Supérieur de Biotechnologie de Beja, Université de Jendouba, B.P. 382, Av. Habib Bourguiba, 9000 Beja, Tunisia 
3Chemistry Department, College of Science, King Saud University, P.O. Box 2454, Riyadh 1145, Saudi Arabia.

*      Corresponding author: hmsbihi@ksu.edu.sa

 

ABSTRACT

The aim of our work was to investigate the effect of dietary supplementation on the milk composition, fatty acid profile, physical properties, and tocopherol contents of milk fat from dairy ewes. Sixty-four multiparous Najdi ewes were selected, randomly distributed into four groups (n = 16), and fed four different diets. The diets were composed of traditional feed (TF, barley and alfalfa hay) and three complete feeds with different compositions (CF1, CF2, and CF3). Twenty-four Najdi ewes were randomly divided into four groups (n = 6) after lambing and fed different diets. Milk fat percentage was higher in the milk of ewes fed TF (5.47%), CF1 (4.95%), or CF2 (6.40%); however, milk protein percentage was higher in the milk of ewes fed CF1 (4.29%) and CF3 (4.64%) compared to TF (3.78%) and CF2 (3.57%). Total (C12:0 + C14:0 + C16:0) saturated fatty acids were significantly lower in milk fat from ewes fed TF (45.67%) and CF1 (42.13%) compared to CF3 (53.65%) and CF2 (49.67%). Linoleic acid (C18:2∆9c,12c; n-6) was significantly higher in milk fat from ewes fed CF1 (4.17%). While, no significant difference was detected for α-linolenic acid (C18:3∆9c,12c,15c; n-3). The percentage of trans-vaccenic acid (C18:1∆11t) was significantly greater in milk fat from ewes fed CF2 (3.54%) followed by CF1 (2.00%), CF3 (1.24%) and TF (0.37%). The conjugated linoleic acid (C18:2∆9c,11t) content was significantly higher in milk fat ewes fed CF1 (0.97%). These results indicate that the FA profile and total tocopherols are significantly affected by the diet type.
 

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Pakistan Journal of Zoology

December

Vol. 51, Iss. 6, Pages 1999-2399

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