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Effect of Feeding Tanniniferous Foliages on N Utilization by Sheep.

M. R. Alam
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202

M. R. Amin
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202

A. K. M. A. Kabir
Department of Animal Science, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

Many fodder trees contain anti-nutritive factors and their presence at high levels can significantly restrict intake, utilization and reduce nutritive value. Strategies of reduction of deleterious effect can improve their feeding values. A short-term in vivo feeding trial was conducted to determine the effect of intake of tannin on feed digestibility, N balance and microbial protein yield in sheep. Twelve adult sheep with a mean live weight of 12.5 (±2.15) kg were used. They were randomly allocated on the basis of live weight to 4 groups of 3 animals. They were housed in individual metabolic crate and water was available at all times. Three feeding trials were conducted and at each trial in addition of basal grass hay to all, 3 groups were offered shade dried Acacia nilotica (Acacia), Albizia procera (Albizia) and Sesbania acculeta (Sesbania) foliages and rest was offered concentrate (broken kheshari and mustard oil cake mixture as control. The amount of feed offered was calculated to provide 15, 10 and 5 g of N/d and 3 levels of tannins to foliages supplemented diet in 3 level of feeding trials. Each trial comprised 7 d preliminary period, 7 d collection period and 10 d rest periods. Sheep was re-randomized after each trial. During the trial feed intake, faeces and urine voided were measured daily and used for calculation of N retention and microbial protein yield. Intakes of total tannins (TT) and condensed tannin (CT) were available and high in Acacia at all feeding levels. Despite of trend for low consumption of Acacia at higher feeding level (level 1), consumption of total tannins and condensed tannin in Acacia supplemented group was high due to its high concentration of these compounds (p<0.01). The foliage in this trial with comparatively less CT may not have any effect on feed intake other than taste and preference for individual foliages. Overall organic matter (CM) and nitrogen (N) digestibility were low and not consistent in these short feeding trials. N digestibility in Sesbania having low CT was high than Acacia and Albizia. Difference in digestion between the foliages may be explained by difference in protein and energy consumption, presence of tannins and fibres for ruminal digestion. Benefit of protein utilization would not be expected in these foliages having low CT level but high protein preceipitable phenolics in Acacia and Albezia may provide increase protein supply at lower digestive tract. Supplementation of Sesbania resulted higher net N retention and high N balance compared to Acacia and Albezia foliages. Apparent low net digestibility in Acacia and Albizia having comparatively high tannins has led to low retention of N. Binding of protein by tannins may have prevented ruminal fermentation, as evident from high N excretion. However, retention of N at low level of foliage intake was similar and low consumption of tannins may not affect their nutritional values.

Keywords: Feed intake, Foliages, Utilization, Sheep

Location: Department of Animal Science.

Start Date: 01-07-2002

End Date: 30-06-2003

Program Area: Animal Health and Management

Commodity: Sheep

Objectives:

1. To reduce the deleterious effect can improve their feeding values. 2. To determine the effect of intake of tannin on feed digestibility, N balance and microbial protein yield in sheep. 3. To provide the 3 levels of tannins to foliages supplemented diet in 3 level of feeding trials.

Methodology:

1. Data collection 2. Organic matter 3. Nitrogen digestibility 4. Feed intake 5. Data analysis

Source of Information: BAU. Bangladesh Agricultural University Research Progress, Volume 13, Proceedings of the Workshop 09-10 April 2003, Bangladesh Agricultural University Research System (BAURES), Mymensingh. Bangladesh.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result of the study was retention of N at low level of foliage intake was similar and low consumption of tannins may not affect their nutritional values. High level of Acacia feeding promoted higher purine derivatives (PD) and estimated microbial N supply and its effect was not apparent in subsequent level. Low PD excretion and microbial N yield by sheep appeared that tannin may increase supply of undegradable protein to small intestines with increases of N intake. Consumption of Acacia resulted low N digestibility, N balance and tannins in Sesbania may not have any effect on utilization.

Knowledge Management: Report/Proceedings