Effects of replacing corn and soya beans with white sorghum and faba beans on milk quality of Sicilo Sarde dairy ewes in Tunisia
2013
H., Selmi | M., Kamoun | G., Tibaoui | A., Ben Gara | H., Rouissi
The effects of using white sorghum seeds and faba beans as feed resources were studied on milk performances in dairy Sicilo-Sarde ewes during the milking phase. Twenty ewes were divided into two homogeneous batches according to age, litter size, rank of lactation and live body weight. Ewes received 1.5 kg DM of oat hay per ewe per day supplemented with 500 g per ewe per day of a standard concentrate diet (group C) or a concentrate composed of local white sorghum, faba beans and a sheep vitamin and mineral supplement (group S). Milk quality was determined once a week on samples of bulk milk batch to measure the fat content by Lactoscan. The concentration of urea in milk was determined by the DMAB method. The extraction of lipids was determined following Folch et al. (1957) method; the fatty acid composition was determined by gas chromatography. The use of the experimental concentrate (white sorghum and faba beans) affected the protein, non-fat solids and lactose contents (pless than 0.05). The average level of urea was 53.5±8.76 and 35.5 ±3.4 mg per dl for the C and S (p less than 0.05), respectively. The main fatty acids were palmitic acid (27.75±1.29 per cent vs. 27.77±1.21 per cent of total fatty acids for the S and C diets, respectively; p greater than 0.05) and miristic acid (12.06±0.82 per cent and 12.47 plus minus 1.21 per cent for CC and CS, respectively; p greater than 0.05). The average of capric acid was comparable in both concentrates (7.17 plus minus 1.17 per cent) in the control group (C) and 7.38 plus minus 1.39 per cent in the experimental group (S). The concentration of conjugated linoleic acid (CLA) was 0.48 plus minus 0.03 and 0.36 plus minus 0.09 per cent for the for the C and S ewe groups, respectively (p greater than 0.05).
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