Effect of particle size of lucerne hay on chewing
activity, digestion and energy balance of Chinese
Holstein heifers

Three 8-month-old Chinese Holstein heifers weighing 300±22.4 kg were selected for a 3×3 Latin square design to study the effects of chopped length of lucerne hay (2, 4 cm, and natural length) on chewing activity and feed utilization efficiency. Results showed that increasing the chopped length of lucerne hay increased eating bout, time spent for eating hay, concentrate and ration, ruminating and total chewing activity. Digestibility was unaffected by the treatments. Decreasing chopped length of lucerne hay decreased heat production and increased energy retained in body.

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1230-1388

Assigning DOI numbers, introducing articles from supplements and recent publications to POL-index database, maintaining anti-plagiarism detection, electronic system to proceed manuscripts and webpage of the Journal with interactive pdf files, and language correction of manuscripts published in Journal of Animal and Feed Sciences are financed in the years 2018–2019 by the Ministry of Science and Higher Education from the funds for science popularization activities, Agreement No. 631/P-DUN/2018.