University of Khartoum

Effects of Water and Food Restriction on Food Utilization and Nitrogen Retention of Desert Goats Fed Good and Poor Quality Roughages.

Effects of Water and Food Restriction on Food Utilization and Nitrogen Retention of Desert Goats Fed Good and Poor Quality Roughages.

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Title: Effects of Water and Food Restriction on Food Utilization and Nitrogen Retention of Desert Goats Fed Good and Poor Quality Roughages.
Author: Ammar Ibrahim El Shafie, Hassan
Abstract: The effect of water and food restriction on feed utilization, weight changes and nitrogen retention were investigated in Sudanese desert goats. Twelve yearling goats were employed in 32 Latin design where they were subjected to three treatments; ad-libitum water and food (control), ad- libitum food and restricted water (to 40% of the control group); ad-libitum water and food reduced to the amount eaten by the water restricted group. The animals weighed 9-16 kg. They were fitted with harness bags for faecal collection and placed in digestibility crates designed for urine collection. The above treatments were repeated using a legume (Medicago sativa, lucerne hay) and grass (Sorghum bicholor, Abu-70 hay). For each feed type the experimental periods were into 10 days adaptation period and seven days measurement period. The results revealed that, with both types of feeds, dry matter intake (DMI) was not significantly affected by both treatments with both types of feed. The ratio of water intake to dry matter intake decreased significantly with water restriction while it increased significantly under food restriction with both types of feeds. This ratio increased significant lucerne hay compared to grass hay. With both feeds the loss in body weight was more significant with water restriction than food restriction. In the lucerne hay treatment, except for crude protein (CP) and nitrogen free extract (NFE) digestibility coefficients of the nutrients were significantly increased by water restriction, whereas with food restriction digestibility of all nutrients (except CP) were significantly reduced. A significant reduction in NFE was observed with water restriction. With grass hay, CP digestibility was significantly reduced by food restriction with a further significant reduction under water restriction. When comparing the two feeds, crude protein digestibility was significantly higher with lucerne hay than grass hay in all groups. NFE digestibility was significantly higher with grass hay than Lucerne hay. In both feeds, nitrogen balance was not affected with either water restriction or food restriction. In all groups, amounts of nitrogen intake excreted in faeces were significantly higher with lucerne hay than grass hay. Significant increases in the amounts retained were observed in the group fed lucerne hay compared with grass hay in both water and feed restricted groups.
URI: http://khartoumspace.uofk.edu/handle/123456789/13861
Date: 2015-06-22


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