University of Tehran Press Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X 2008-6776 22 3 2020 09 22 Effect of different levels of sesame meal on dry matter intake, milk production and composition, blood metabolites and apparent nutrient digestibility in early lactation Holstein cows Effect of different levels of sesame meal on dry matter intake, milk production and composition, blood metabolites and apparent nutrient digestibility in early lactation Holstein cows 349 356 76897 10.22059/jap.2020.290511.623449 FA Mehrdad Shahizad Department of animal science, University of Zanjan Hamid Amanlou Department of animal science, University of Zanjan 0000-0002-5631-125X Najme Eslamian Farsuni Department of Animal Science, Agriculture and Natural Resources Research Center, Shahrekord, Iran 0000-0002-7921-3302 Tahere Amirabadi Farahani Department of animal science, Sharekord University 0000-0001-5433-1946 Hadi Khabazan Department of animal science, University of Zanjan Journal Article 2019 11 25 The objective of present study was to investigate the effect of different levels of sesame meal in early lactation cow's ration on dry matter intake, milkyield and composition, apparent digestibility of nutrients and blood metabolites. Six dairy lactating Holstein cows with average DIM 26± 3 (n=3primiparous and n=3 multiparous cows) were randomly assigned to 1 of 3 experimental treatments (different levels of sesame meal) in repeated 3×3Latin square design. Experimental treatments were control (without sesame meal), 4.33% sesame meal and 8.66% sesame meal (DM basis). Theexperimental periods consisted of 21 d with the first 14 days as adaptation and the last 7 days as sampling days. Increasing level of sesame meal inearly lactation rations did not affect dry matter intake, milk yield and composition (fat, protein and lactose), feed utilization efficiency, apparentdigestibility of nutrients and blood metabolites (P  0.05), while milk urea nitrogen decreased with increasing the level of sesame meal (p < 0.05).Blood urea nitrogen concentrations also tended (P = 0.1) to decrease with increasing levels of sesame oil. In general, the lack of response in feedintake and milk yield with increasing the levels of sesame meal in early lactation cow's ration showed that sesame meal could be a proper proteinsource in early lactation cow's ration. The objective of present study was to investigate the effect of different levels of sesame meal in early lactation cow's ration on dry matter intake, milkyield and composition, apparent digestibility of nutrients and blood metabolites. Six dairy lactating Holstein cows with average DIM 26± 3 (n=3primiparous and n=3 multiparous cows) were randomly assigned to 1 of 3 experimental treatments (different levels of sesame meal) in repeated 3×3Latin square design. Experimental treatments were control (without sesame meal), 4.33% sesame meal and 8.66% sesame meal (DM basis). Theexperimental periods consisted of 21 d with the first 14 days as adaptation and the last 7 days as sampling days. Increasing level of sesame meal inearly lactation rations did not affect dry matter intake, milk yield and composition (fat, protein and lactose), feed utilization efficiency, apparentdigestibility of nutrients and blood metabolites (P  0.05), while milk urea nitrogen decreased with increasing the level of sesame meal (p < 0.05).Blood urea nitrogen concentrations also tended (P = 0.1) to decrease with increasing levels of sesame oil. In general, the lack of response in feedintake and milk yield with increasing the levels of sesame meal in early lactation cow's ration showed that sesame meal could be a proper proteinsource in early lactation cow's ration. https://jap.ut.ac.ir/article_76897_d30b1cdd4e457e9643142c12072c30e5.pdf