The Effects Of Different Levels Of Energy And Protein On Growth And Carcass Composition Of Western Baggara Bulls

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Date
2015-04-01
Authors
AWAD ELSEED, BABIKIR
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Publisher
UOFK
Abstract
Two levels of energy (9.5 and 12MJ/kg DM I) and two levels of protein (10 and 16Pct.) were used with a total of (20) Western Baggara bulls to study the effect of energy X protein interaction on growth, carcass characteristics and carcass composition in a (2x2) factorial experiment repeated for three times. The result indicate that there were no energy X protein interaction on animal performance, carcass yield and carcass composition. The study proved that the effect of energy is more pronounced than the effect of protein on meat quantitative and qualitative traits. This appears in the superiority of high energy level on growth rate, feed conversion efficiency. The average daily gain / head for the different groups high energy high protein (HE-HP), high energy low protein (HE-LP), low energy high protein (LE-HP) and low energy low protein (LE-LP) were 1000g, 801g, 726g and 681g respectively. A similar trend was noticed for feed conversion efficiency for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP) as 8.4, 11, 15.1 and 17 respectively. The study indicate high energy level had (P<0.05) meaningful significant difference on slaughter weight (271, 270, 269 and 267) for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). Increasing energy level appears to result in a no. of significant changes (empty body weight, hot carcass, cold carcass, chiller shrinkage and dressing percentage). A significant differences (P<0.001) for empty body weight (245, 243, 237 and 238) for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). A significant differences (P<0.001) for hot carcass weight (140, 141, 134 and 133) for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). A significant differences (P<0.001) for cold carcass weight (138, 138, 132 and 130) for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). A significant differences (P<0.001) for chiller shrinkage (1.5, 2, 2.7 and 2.8) for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). A significant (P<0.01) differences for (D.O.%) of hot and cold carcass on slaughter weight basis (51.6,52.2, 49.8 and 47.9) and (50.7, 51.3, 49.1 and 48.7) respectively for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP), whereas A significant (P<0.01) and (P<0.001) for (D.O.%) of hot and cold carcass on empty body weight (57.1, 58, 56.8 and 55.8) and (56.1, 56.7, 55.3 and 54.2) respectively for the different groups (HEHP), (HE-LP), (LE-HP) and (LE-LP). Other carcass characteristics (area of longissimus dorsi and subcutaneous fact thickness) were (P<0.05) and (P<0.001) significantly greater in bulls fed high energy diet (42.8, 42.1, 38 and 38.3) and (4, 4, 3 and 3) respectively for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). The major tissue distribution showed that increasing energy level in the diet gave leaner carcasses with optimum fat than do the low-energy diet, a non significant (P>0.05) and significant (P<0.05) differences (65.7, 65.3, 64.9 and 64.5) and (8.3, 7.6, 7.4 and 7.1) respectively for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). High priced cuts were significantly (P<0.05) heavier (61.2, 61, 60.2 and 59.8) respectively for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE-LP). Meat quality traits were positively affected by increasing energy level. Proximate chemical analysis indicates that the bulls fed the high-energy diet scored a significant (P<0.05) and (P<0.01) higher percentage of sacroplasmic and ether extract (6.2, 6, 6, and 6.1) and (2.1, 2, 2, and 1.9) respectively for the different groups (HE-HP), (HE-LP), (LE-HP) and (LE LP).
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THE EFFECTS OF DIFFERENT LEVELS OF ENERGY AND PROTEIN ON GROWTH AND CARCASS COMPOSITION OF WESTERN BAGGARA BULLS
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