University of Khartoum

Comparative Growth and Body Components of Goat Kids Fed on Different Protein Energy Levels

Comparative Growth and Body Components of Goat Kids Fed on Different Protein Energy Levels

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Title: Comparative Growth and Body Components of Goat Kids Fed on Different Protein Energy Levels
Author: Abbas Siddig, El Fadil
Abstract: Twenty eight entire male Nubian goat kids and twenty eight female Nubian goat kids (5-6 month old) were used with an average initial live weight of 18 and 15 kg for the male and female kids, respectively. Each sex group was divided into four similar subgroups of seven kids each using stratified randomized weight distribution. Four experimental diets of high energy, high protein (HEHp)(11MJ/kg,160gcp/kg), high energy low protein (HEHp) (11MJ/kg,120gcp/kg), low energy high protein (LEHp) (9MJ/kg,160gcp/kg), and low energy low protein (LELp) (9MJ/kg,120gcp/kg) were formulated for each sex. The four combinations of rations were based on sorghum, molasses, wheat bran, groundnut hulls and groundnut cakes. Each group of male and female kids was assigned at random to one of the four dietary treatments in a 2x2x2 factorial arrangement. The study lasted for 97 days including 7 days adaptation period. During the study daily feed intake and weekly live weight changes were recorded. The results of the feeding trial indicated that the males were superior to females in live weight gain, feed intake and feed conversion rate (FCR).The best daily live weight gain in male and female groups was that of group (HEHp) which showed significantly (P<0.05) higher average values (0.061± 0.02 and 0.045±0.02 for male and female groups, respectively). While the worst was that of group (LELp) and the average values were 0.045±0.03 and 0.028±0.0 I for males and females, respectively. The feed intake and FCR took a similar trend to live weight gain. The results of the digestibility trial indicated a similar pattern as the feeding trial with ration HEHp, which showed significantly (P<0.05) better average values in DDM, DOM and DCP (74.22±3.9, 64.9±2.5 and 88.2± 4.3, respectively), while ration LELp, showed the lowest average values (55.25± 3.2, 45.7± 2.4 and 71.2±3.1) for DDM, DOM and DCP, respectively. The carcass analysis results indicated that males were significantly superior to females in slaughter weight, hot and cold carcass weight and hot and cold dressing out percentages. The weight and percentages of non-carcass components were significantly (P<0.05) different among males and females and among energy and protein levels. All carcass joint cuts weight and percent revealed significant (P<0.05) differences due to treatment and sex interaction. There were significant (P<0.05) differences due to treatment and sex interaction on muscle, bone, fat and connective tissues percent of test groups, and males showed superior muscle percent compared to females, while females showed superior fat and bone percent. Meat chemical composition revealed significant (P< 0.05) differences due to treatment and sex effect. However, females showed higher fat percent than males, while males showed higher protein percent than females. Moisture and ash percent were similar in the two sexes. All subjective and objective meat quality parameters revealed no significant (P>0.05) differences expect for WHC, ultimate pH and lightness L. The average values for lightness (L) component were 32.8, 30.1, 31.8, 29.5 and 34.8, 33.5, 36.9, 31.3 for male and female test groups, respectively. This study concluded that feeding high-energy high protein or high energy low protein to male and female Nubian kid gave better results in all parameters measured.
URI: http://khartoumspace.uofk.edu/handle/123456789/14399
Date: 2015-06-23


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