Document Type : Research Paper
Authors
1 MSc. Student in Animal Nutrition, Department of Animal Sciences, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. PC:+983158777871
2 Assistant Professor, Department of Animal Sciences, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. PC:+983158777871
3 faculty member
4 Department of Animal Science, College of Agricultural and Natural resources, University of Tehran, Karaj, Iran. PC: 3158777871
Abstract
To investigate the interaction effects between season and dietary forage particle size on milk yield and composition, one hundred early lactating Holstein were allocated. Dietary forage particle size included long (7.7 mm) and fine (4.4 mm), were adjusted as an experimental treatment per season. The results showed that raw milk yield, protein, lactose and total solid percentage of milk were higher within spring compared to summer (p< 0.01). Milk yield and milk lactose percentage for cows fed fine forage particle size trended to be higher than cows fed long forage particle size. Also, the amount of dry matter consumed within two hours after feeding for summer was higher than spring. Totally results revealed that cows fed with fine forage particle size had more homogeneous feeding behavior pattern within both studied season than cows fed long forage particle size.
Keywords
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