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University of Khartoum (1989)

Effect of Concentrate-To-Roughage Proportions on Performance and Carcass Characteristics of Sudan Desert Goats

Ahmed Mukhtar Elamin

Titre : Effect of Concentrate-To-Roughage Proportions on Performance and Carcass Characteristics of Sudan Desert Goats

Auteur : Ahmed Mukhtar Elamin

Université de soutenance : University of Khartoum

Grade : Master of Science 1989

Résumé
This experiment was conducted to study the effect of concentrate-to-roughage proportions on performance and carcass characteristics of Sudan desert goats. Fifteen male goat kids were utilized in the growth trial for 56 days. Three groups were assigned to three experimental diets : A high concentrate (HC) diet composed of 37% cottonseed cake, 37% sorghum grains 25% groundnut hulls and 1% common salt ; medium concentrate (MC) diet composed of 29.5% cottonseed cake, 29.5% sorghum grains, 40% groundnut hulls and 1% common salt ; and low concentrate (LC) diet composed of 2% cottonseed cake, 22% sorghum grains, 75% groundnut hulls and 1% common salt. During the experimental period feed intake, live weight gain, final live weight and feed conversion ratio were recorded. At the end of this trial, experimental animals were slaughtered to study some carcass characteristics. No significant difference (P>0.05) was observed among dietary treatments regarding daily gain (g), feed intake (kg) and feed conversion ratio. The values of these parameters were 124.4, 1.03, and 8.33 ; 120.4, 1.08, 9.00 ; 108.00, 1.18, 11.76 for kids fed HC, MC and LC, respectively. Nine goat kids were utilized in the digestibility trial. No significant differences (P>0.05) were observed among dietary treatments in digestion coefficients of dry matter, organic matter, crude protein and crude fibre. Digestion coefficients of ether extract and nitrogen free extract were significantly different (P<0.05) among the three dietary treatments. The digestion coefficient of ether extract for goat kids given HC, MC and LC diets were 93.4, 91.10 and 87.1, respectively. The values of nitrogen free-extract were 74.8, 67.07 and 62.97 for kids offered HC, MC and LC diets, respectively. Percentages of digestible crude protein, ether extract and nitrogen free extract differed significantly (p<0.01) among dietary treatment groups. No significant difference (P>0.05) was observed in digestible crude fibre among dietary treatments. Percentages of total digestible nutrients (TDN) were found to differ significantly (P<0.01) among dietary treatment groups. The values of this parameter for kids given HC, MC and LC diets were 65.43, 56.17 and 51.97, respectively. Dietary treatments did not affect (P>0.05) the carcass characteristics except dressing percentage (on slaughter weight basis). The dressing percentage for goat kids given HC, MC and LC diets were 48.28, 47.25 and 45.56, respectively. The proportions of whole sale cuts did not differ significantly (P>0.05) among dietary treatments. No significant differences (P>0.05) were observed in percentages of muscle, bone, fat and muscle to bone ratio among dietary treatment groups. The slaughter by-products showed no significant (p>0.05) differences among dietary treatment groups. The percentages of protein, fat and ash were not significantly different (P>0.05) among the three dietary treatment groups, but the percentages of protein and fat appeared to increase slightly as the level of concentrate increased, and the percentage of moisture increased significantly as the level of concentrate increased

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