Influence of dietary supplementation with sunflower oil and quebracho tannins on growth performance and meat fatty acid profile of Awassi lambs

The inclusion of QT in the diet increased the content of the conjugated linoleic acid in the lamb meat above that achieved with SF supplementation only. Addition of the combination of QT and SF to the diet enhanced the content of conjugated linoleic acid (C18:2 c9t11) of the lamb meat. This could be due to the reduction in the bio-hydrogenation of unsaturated fatty acids in the diet. The results suggest that inclusion the combination of QT and SF in lamb diets improved the healthy fatty acids content in the meat without an adverse effect on animal performance.The influence of dietary supplementation with quebracho tannins (QT) or/and sunflower oil (SF) on growth performance and fatty acid profile in meat of Awassi lambs was studied. Seventy-two lambs were assigned randomly to nine diets (8 per group) in the experiment following a 32 factorial design with all possible combinations of two factors, SF and QT each at three levels i.e. 0 (control), 20 or 40 g/kg diet DM. A significant SF ×QT interaction was observed on the conjugated linoleic acid content of intramuscular fat (P =0.007), but not on average daily weight gain (P=0.11). Addition of QT at 40 g/ kg DM significantly increased average daily gain comparing to control diet

Influence of dietary supplementation with sunflower oil and quebracho tannins on growth performance and meat fatty acid profile of Awassi lambs

The influence of dietary supplementation with quebracho tannins (QT) or/and sunflower oil (SF) on growth performance and fatty acid profile in meat of Awassi lambs was studied. Seventy-two lambs were assigned randomly to nine diets (8 per group) in the experiment following a 32 factorial design with all possible combinations of two factors, SF and QT each at three levels i.e. 0 (control), 20 or 40 g/kg diet DM. A significant SF ×QT interaction was observed on the conjugated linoleic acid content of intramuscular fat (P =0.007), but not on average daily weight gain (P=0.11). Addition of QT at 40 g/ kg DM significantly increased average daily gain comparing to control diet. The inclusion of QT in the diet increased the content of the conjugated linoleic acid in the lamb meat above that achieved with SF supplementation only. Addition of the combination of QT and SF to the diet enhanced the content of conjugated linoleic acid (C18:2 c9t11) of the lamb meat. This could be due to the reduction in the bio-hydrogenation of unsaturated fatty acids in the diet. The results suggest that inclusion the combination of QT and SF in lamb diets improved the healthy fatty acids content in the meat without an adverse effect on animal performanc

Genetics CROSSBREEDING EFFECTS FOR CARCASS, TISSUES COMPOSITION AND MEAT QUALITY TRAITS IN A CROSSING PROJECT OF V-LINE WITH SAUDI GABALI RABBITS

ABSTRACT A five-year crossbreeding project involving Spanish maternal line called V-line (V) and Saudi Gabali (S) rabbits was carried out to produce 14 genetic groups of V, S, ½V½S, ½S½V, ¾V¼S, ¾S¼V, 2 ) 2 , Saudi 2 (synthetic maternal line), and Saudi 3 (synthetic paternal line). A total number of 2770 rabbits produced by 91 sires and 402 dams were used to evaluate carcass components, tissue composition and meat quality traits. A generalized least square procedure was used to estimate additive and heterotic effects (direct, maternal, and grand-maternal). The estimates of direct additive effects were significant and in favour of V line rabbits for the majority of traits studied, ranging from 3.8 to 9.0% for slaughter and edible carcass components, 3.4 to 10% for non-edible traits, -3.1 to 9.8% for tissues compositions, and -14.9 to 2.5% for meat quality traits. Maternal additive effects were significantly in favour of V line by 1.66% for meat ether extract (11.1% relative to the average of the V line and Gabali as purebreds). Grandmaternal additive effects were not significant in most traits studied except dry matter and ash contents in meat since the effect of the V line was higher than the effect of the Gabali by 0.5% and 1.39%, respectively (0.7% and 15.4% of the respective averages of the pure breeds). Heterosis estimated for non-edible traits were mostly positive and only significant for head weight (direct and grand-maternal heterosis), fur weight (grand-maternal heterosis), lung weight (maternal and grand-maternal heterosis) and viscera weight (maternal and grand-maternal heterosis); the estimates were small relative to the average of purebreds reaching 6.4% as maximum value. Estimates of direct, maternal and grandmaternal heterosis for meat weight were found to be consistent and positive (3.9, 4.5 and 5.0%, respectively) associated with significant direct heterosis for fat weight (12.2%), maternal heterosis for meat bone ratio (4.5%), and maternal and grand-maternal heterosis for dry matter in meat. The estimates of direct heterosis for protein content in meat were significantly positive (1.4%), but the estimates for grand-maternal heterosis were significantly negative (-2.1%). For fat content in meat, the estimates of direct (-8.3%) and maternal heterosis (-11.9%) were significant, while for ash content the estimates for maternal (23.7%) and grand-maternal heterosis (30.1%) were significantly positive