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Replacement of Wheat Bran by Biogas Slurry and Their Effect on Intake and Digestibility of Deshi Sheep

F.M.A. Hossain
Department of Animal Science, Bangladesh Agricultural University, Mymensingh

R.I. Khan
Department of Animal Science, Bangladesh Agricultural University, Mymensingh

A.B.M.R. Bostami
Department of Animal Science, Bangladesh Agricultural University, Mymensingh

A. Mondal
Department of Animal Breeding & Genetics Bangladesh Agricultural University, Mymensingh

M.A.K. Azad
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

The present experiment was conducted to study the effect of feeding biogas slurry (BGS) on the feed intake, digestibility and growth performance of sheep taking four indigenous male sheep were housed in individual pens in a 4×4 latin square design at each feeding trial of 7 days preliminary period followed by 7 days measurement period at Sheep and Goat farm, BAU, Mymensingh. Standard grower ration was formulated and wheat bran was replaced by 5, 10 and 15% by biogas slurry. The crude protein of wheat bran is slightly higher than slurry but there exists no significant effect on feed intake and digestibility of sheep. Crude protein consumption linearly decreased with the increase of slurry in the ration but difference among the diets was not significant. Crude fibre consumption per unit gain increased (p<0.05) with each replacement of wheat bran with slurry. Incorporation of BGS significantly (p<0.05) affected the digestibility of various nutrients. Significant (p<0.05) effects of incorporating the biogas slurry in the control diet was observed. Average daily body weight gain of sheep was similar even the increase of biogas slurry in diet up to 15% instead of wheat bran. The above data postulated that the biogas slurry may be incorporated up to 15 % in growing sheep diets without disturbing its growth and other common physiology.

Keywords: Biogas slurry, Digestibility, Growth, Sheep

Location: Goat and Sheep farm, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh

Start Date: 00-02-2008

End Date: 00-04-2008

Program Area: Animal Health and Management

Commodity: Feed

Objectives:

1. To find out the effect of incorporating biogas slurry (BGS) in the rations on the growth performance and digestibility of nutrients in growing sheep.

Methodology:

The feeding trial was conducted for a period of 56 days at Goat and Sheep farm, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh. Animals were adapted with experiment feed and metabolic crates for 21 days before the feeding trial. A 4×4 Latin Square Design was used where 4 sheep and 4 feeds constituted the experimental animal and treatments, respectively. The feeds were - natural grass + concentrate mixture (F1), natural grass + concentrate mixture containing 5% slurry (F2), natural grass + concentrate mixture containing 10% slurry (F3) and natural grass + concentrate mixture containing 15% slurry (F4). The length of each trial was 14 days having 7 days of preliminary and 7 days of measurement periods. In this experiment, ingredients of concentrate mixture were wheat bran, rice polish, maize (mash), mustard oil cake, molasses, and salt and biogas slurry (Table 3.2). For the preparation of 100 kg of concentrate mixture, 17 kg maize mash, 20 kg rice polish, 16 kg mustard oil cake, 5 kg molasses and 1 kg salt were common in all feed. Forty one kg wheat barn was added in feed-1(F-1). Wheat bran was replaced by slurry at the rate of 5, 10, and 15% slurry in feed-2 (F-2), feed-3 (F-3) and feed-4 (F-4), respectability. So F-2, F-3 and F-4 were contained 36, 31 and 26 kg of wheat bran, respectively. Before commencement of feeding trial, ten sheep from the farm was adapted to the slurry feeding. Out of them, four adult sheep of 14-18 months old and 13.73±0.90kg live weight were selected for experiment. Sheep were kept in individual metabolic crate in well ventilated room throughout the experiment. The crates were facilitated for individual feeding, watering and separator made of wire mess. Sheep were drenched against gastro-intestinal parasites and fed at the rate of 3.5 kg DM/100 kg live weight to satisfy the appetite of the animals. This was adjusted weekly on the basis of live weight change of the animals in all treatment groups. Required dry matter for individual animal was supplied by both roughage and concentrate sources of the ration at the ratio of 2:1. The concentrate mixture was supplied to each animal individually at 7.00 a.m. Grasses were supplied twice daily, 60% in the morning and the rest in the afternoon. Water was supplied ad libitum basis. At the beginning of experiment, animals were weighed for three consecutive days before supplying of morning feed. Average weight was taken as initial weight. Thereafter, animals were weighed individually throughout the experimental period every 7 days interval at a fixed time of 7 a.m. At the end of experiment, animals were weighed for three consecutive days and average weight was considered as final weight. Live weight gain was measured by subtracting initial weight from final weight. The daily live weight gain was calculated by dividing the total weight gain by total number of experimental days. Faeces were collected from each sheep separately and weighted during the feeding period. From the composite samples of about 10% of well mixed faeces of each animal were preserved in a refrigerator during the collection period. After collection, about 10% of mixed faeces were allowed to sun dry. Before drying, 10g of mixed sample was taken separately to determine of dry matter of the faeces. The digestibility of the feed was calculated by using the following formula: Digestibility (%) = [(Intake-Outgo)/Intakex100]. Representative samples of feed, refusal and faces were subjected to chemical analysis for the determination of dry matter (DM), Organic matter (OM), crude protein (CP), crude fiber (CF). All the samples were analyzed in duplicate and mean values were recorded. The data were statistically analyzed as a Latin Square Design by analysis of variance using MSTAT-C statistical programme. The treatment mean for each parameter were tested using Duncun Multiple Range Test (DMRT).

Source of Information: J. Agrofor. Environ. 2(2): 147-150, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Standard grower ration was formulated and wheat bran was replaced by 5, 10 and 15% by biogas slurry. The crude protein of wheat bran is slightly higher than slurry but there exists no significant effect on feed intake and digestibility of sheep. Crude protein consumption linearly decreased with the increase of slurry in the ration but difference among the diets was not significant. Crude fibre consumption per unit gain increased (p<0.05) with each replacement of wheat bran with slurry. Incorporation of BGS significantly (p<0.05) affected the digestibility of various nutrients. Significant (p<0.05) effects of incorporating the biogas slurry in the control diet was observed. Average daily body weight gain of sheep was similar even the increase of biogas slurry in diet up to 15% instead of wheat bran. The above data postulated that the biogas slurry may be incorporated up to 15 % in growing sheep diets without disturbing its growth and other common physiology.

Knowledge Management: Journal