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Effects of supplementary concentrate composition on milk yield, milk composition and pasture utilization of rotationally grazed dairy cows

Effects of supplementary concentrate composition on milk yield, milk composition and pasture utilization of rotationally grazed dairy cows

Animal Feed Science and Technology 56(1-2): 143-154

Twenty eight lactating cows were used in a randomized block design experiment to evaluate the effects of supplementary nitrogen source and heat treatment of rapeseed meal containing concentrate compound on pasture utilization under a controlled rotational grazing system. The four supplemental concentrates were: 1) a cereal by-product based basic dairy concentrate (BDC); 2) BDC with 0.9% additional urea (UREA); 3) BDC with 12% rapeseed meal (RSM); and 4) expanded (heat treated) concentrate compound containing BDC and 12% rapeseed meal (EDC). The crude protein (CP, g kg-1 DM) content in the supplement was 124 (BDC), 150 (UREA), 154 (RSM) and 156 (EDC) respectively. The supplementary concentrate was fed at a fixed rate of 0.30 kg-1 of milk. Daily milk yield and concentrate consumption were recorded. No differences existed among four concentrate supplements for energy corrected milk yield (27.4, 26.9, 27.1, 27.7 kg d-1) and fat content, (39.9, 38.2, 38.1, 39.8 g kg-1). Milk protein content tended to decrease (P lt 0.06) on UREA supplement compared to RSM and EDC. Milk lactose content was significantly (P lt 0.01) low on BDC compared to the other three supplements. Both herbage height (HH) and herbage mass (HM) data indicated that there was a good amount of herbage ha-1 before grazing. The mean herbage organic matter (kg OM per cow per day gt 4 cm) available (HOMA) was 13.8, 24.5, 17.2 and 18.2 for the months of May, June, July and August-September, respectively. The mean in vitro organic matter digestibility (IVOMD, g kg-1) was 788 and 770 for the periods of May and June and then dropped to 696 and 686 in the second half of the experimental period.

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Accession: 002824873

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DOI: 10.1016/0377-8401(95)00806-x

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