Document Type : Research Paper
Authors
1 Department of Animal Sciences, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. PC:+983158777871
2 Assistant Professor, Department of Animal Science, Faculty of Agricultural Science and Engineering, College of Agricultural and Natural Resources, University of Tehran, Karaj, Iran
3 Associate Professor, Department of Animal Science, Faculty of agricultural science and engineering, College of Agricultural and Natural Resources, University of Tehran, Karaj, Iran. PC: +983158777871
Abstract
The current study was conducted to investigate the effect of dietary supplementing of condensed molasses soluble (Vinasse) in heat stressed mid-lactating Holstein cows on milk yield and composition, apparent nutrient digestibility and economical parameters. The experiment was performed by 84 Holstein lactating dairy cows (DIM: 155±25; MY: 32±3) in a completely randomized design with three treatments 1) basal diet without vinous (control), 2) diet containing 5% of vinasse (2.2 kg/head/day) and 3) diet containing 10% 0f vinasse (4.4 kg/head/day). The study was conducted in the summer season with a temperature -humidity index of 75.1. The experiment lasted for 25 days (15 days for adaptation and 10 days for sampling). Dry matter intake of the treatment fed a 10% vinasse supplemented diet was higher than the other treatments (P<0.05). Dry matter and NDF digestibility coefficients were increased by increasing the level of vinasse in the diets, compared to the control (P<0.05). The economical index of income over feed cost was the highest for the diet containing 5% of vinasse. Totally, regarding to the chemical composition of the vinasse and its beneficial impacts on the performance of the cows under heat stress, using 5% of dry matter vinasse supplementation (2.2 kg wet weight/day or 1.1 kg dry matter/day) can improve nutrient digestibility and reduce feed costs without any adverse effects on dry matter intake.
Keywords
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