Effects of feeding alfalfa hay on chewing, rumen pH, and milk fat concentration of dairy cows fed wheat dried distillers grains with solubles as a partial substitute for barley silage

Journal of Dairy Science
S Z ZhangM Oba

Abstract

The objective of this study was to determine the effects of feeding alfalfa hay on chewing activity, rumen fermentation, and milk fat concentration of dairy cows fed wheat-based dried distillers grains with solubles (DDGS) as a partial replacement of barley silage. Thirty lactating Holstein cows (220+/-51 DIM), 6 of which were ruminally cannulated, were used in a 3 x 3 Latin square design with 21-d periods. Cows were fed a control diet [CON; 50% barley silage and 50% concentrate mix on a dry matter (DM) basis], a diet in which barley silage was replaced with DDGS at 20% of dietary DM (DG), or a diet in which barley silage was replaced with DDGS and alfalfa hay at 20 and 10% of dietary DM, respectively (DG+AH). All diets contained approximately 20% crude protein. Compared with the CON diet, cows fed DG and DG+AH diets respectively had greater DM intake (20.1 vs. 23.1 and 22.7 kg/d); yields of milk (24.5 vs. 27.3 and 28.1 kg/d), milk protein (0.88 vs. 0.99 and 1.01 kg/d), and milk lactose (1.11 vs. 1.24 and 1.29 kg/d); and body weight gain (0.25 vs. 1.17 and 1.23 kg/d). However, compared with cows fed the CON diet, cows fed the DG and DG+AH diets respectively had lower chewing time (38.3 vs. 30.7 and 31.5 min/kg of DM intake), me...Continue Reading

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Citations

May 14, 2003·Journal of Dairy Science·P J Kononoff, A J Heinrichs
May 23, 2007·Journal of Dairy Science·D H KleinschmitA R Hippen
Jul 26, 2019·Journal of Animal Physiology and Animal Nutrition·Nima NaderiMorteza Hosseini Ghaffari
Nov 11, 2019·Journal of Dairy Science·A MenschingA R Sharifi
Jan 7, 2021·Animals : an Open Access Journal From MDPI·Philip C GarnsworthyNeil Saunders

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