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Effects of Replacement of Concentrate Mixture by Broccoli Byproducts on Lactating Performance in Dairy Cows

  • Yi, X.W. (Institute of Dairy Science, College of Animal Sciences, Zhejiang University) ;
  • Yang, F. (Institute of Dairy Science, College of Animal Sciences, Zhejiang University) ;
  • Liu, J.X. (Institute of Dairy Science, College of Animal Sciences, Zhejiang University) ;
  • Wang, J.K. (Institute of Dairy Science, College of Animal Sciences, Zhejiang University)
  • Received : 2015.01.06
  • Accepted : 2015.04.15
  • Published : 2015.10.01

Abstract

The objective of the present study was to determine the effects of feeding pelletized broccoli byproducts (PBB) on milk yield and milk composition in dairy cows. In Trial 1, an in vitro gas test determined the optimal replacement level of PBB in a concentrate mixture in a mixed substrate with Chinese wild ryegrass hay (50:50, w/w) at levels of 0, 10%, 20%, 30%, or 40% (dry matter basis). When the concentrate was replaced by PBB at a level of 20%, no adverse effects were found on the gas volume or its rate constant during ruminal fermentation. In trial 2, 24 lactating cows (days in milk = $170.4{\pm}35$; milk yield = $30{\pm}3kg/d$; body weight = $580{\pm}13kg$) were divided into 12 blocks based on day in milk and milk yield and randomly allocated to two dietary treatments: a basic diet with or without PBB replacing 20% of the concentrate mixture. The feeding trial lasted for 56 days; the first week allowed for adaptation to the diet. The milk composition was analyzed once a week. No significant difference in milk yield was observed between the two groups (23.5 vs 24.2 kg). A significant increase was found in milk fat content in the PBB group (p<0.05). Inclusion of PBB did not affect milk protein, lactose, total solids or solids-not-fat (p>0.05). These results indicated that PBB could be included in dairy cattle diets at a suitable level to replace concentrate mixture without any adverse effects on dairy performance.

Keywords

Broccoli Byproducts;Rumen Fermentation;Milk Yield;Milk Composition

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Cited by

  1. Comparative Phytonutrient Analysis of Broccoli By-Products: The Potentials for Broccoli By-Product Utilization vol.23, pp.4, 2018, https://doi.org/10.3390/molecules23040900