Graduate Thesis Or Dissertation

 

Use of grape pomace as a substitute for barley grain in diets of wintering ewe lambs Public Deposited

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  • Tunisia, like many other countries in the world, suffers from a shortage of feedstuffs and an overall nutrition problem is facing the livestock industry. Large quantities of feeds are imported to meet the animals' needs in energy and protein. At the same time, considerable quantities of crop residues and agro-industrial wastes suitable for use as feed for the animals are lost or underutilized. Grape pomace, which is the refuse left from the production of grape juice and wine, constitutes one of the most important crop residues, second only in volume to straw. The purpose of this study was to assess the suitability of this by-product in dried and wet forms as supplementary feed for sheep and to determine its influence, when incorporated in the diet at a level of 20%, on the weight gain and voluntary feed intake of sheep. To conduct this feeding trial, 108 female lambs of an average age of 10 months including representatives of three available sheep breeds (Coopworth, Polypay and Suffolk and crosses of these), and weighing an average of about 41.5 Kg, were used over a period of 30 days. The trial was laid out in a completely randomized block design with more than one observation per block. The blocking criterion was the breed (six different breed types). Three animals from each breed were randomly selected according to their weights (heavy, medium or light) and randomly assigned to the three treatments: Control diet of barley grain, chopped grass hay and soybean meal mixed with salts and minerals; Treatment 1 of 20% wet grape pomace replacing the same amount of barley grain; and Treatment 2 of 20% dried grape pomace replacing the same amount of barley grain. Substitutions were made on a dry-matter basis Since there were six breeds and 108 lambs in total, there were 18 lambs per group and two groups per treatment, totaling 6 groups housed in 6 adjacent pens. Daily dry matter intakes did not differ significantly among treatments. The values obtained were 1.475, 1.495, and 1.495 Kg respectively for the control, treatment 1, and treatment 2. There were, however, significant differences in daily live weight gains between treatments. The values obtained were 166, 198, and 219 g respectively for the control, treatment 1, and treatment 2. These results indicate a satisfactory animal performance in terms of live weight gain and feed intake. Both forms of grape pomace (wet and dried) were readily accepted by sheep. These results were in agreement with the findings of other grape pomace feeding trials cited in the literature review.
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