Abstract
Nutrition is one of many factors that affects milk yield in dairy cows. Increasing the protein concentration in the supplement increases milk yield of cows receiving grass silage based diets (Huhtanen et al., 1995). Gross margins for purchased feed per litre milk produced can be reduced by decreased feeding of purchased concentrates and replacement with cheaper home-produced roughages (Browne et al., 1995). In the Western Cape, oat silage is often used in combination with lucerne hay or wheat straw in the feeding of dairy cows (Muller & Botha, 1998). No information is available concerning the ideal combination of oat silage and lucerne hay for dairy cows. The objectives of this study were to determine the production performance of lactating dairy cows receiving varying levels of oat silage and lucerne hay and to determine the maximum level of oat silage that can be included in the diet without impairing the performance of cows.
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