Effect of increasing concentration of dietary fiber in diets supplemented with plant oil on milk fat concentration, rumen parameters and feeding behavior of mid-lactating cows

Document Type : Research Paper

Authors

1 Associate Professor, Faculty of Agriculture, University of Zanjan, Zanjan, Iran

2 Former M. Sc. Student, Faculty of Agriculture, University of Zanjan, Zanjan, Iran

3 Former Ph.D. Student, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

4 Senior Researcher at Ati Zist Dam Co. Karaj, Iran

Abstract

This experiment was conducted to investigate the effects of different levels of dietary NDF in diets rich in plant oil (sunflower) on milk performance and feeding behavior of mid-lactating Holstein dairy cows. Four primiparous (BW: 525±30 kg; DIM: 103±6) and four multiparous (BW: 587±88 kg; DIM: 99±12) cows were used in a 4×4 replicated Latin square design with 21-d experimental periods. Cows were received 1 of 4 four treatments: 1) 31% fiber (NDF) and no supplement plant oil, LF, 2) 31% fiber with 2% supplement plant oil, LFO 3) 35% fiber with 2% plant oil, MFO 4) 39% fiber with 2% plant oil, HFO. Daily dry matter intake (DMI), milk yield and composition, blood metabolites, dry matter digestibility, rumen fluid characteristics and BW variations were determined. There was no significant different in milk production among diets. Milk fat (P<0.01) and protein (P<0.05) concentrations were significantly affected by treatments. Dry matter intake and DM digestibility were higher (P<0.01) in LFO diet. The cows fed HFO had higher NDF digestibility (P<0.01). Total VFA and acetate concentration were greater for HFO diet and propionate concentration was greater for LFO diet (P<0.01) than the others. Rumen fluid pH was increased by increasing dietary NDF concentration (P<0.01). Chewing activity was positively affected by increasing concentration of dietary NDF (P<0.01). This study showed that diets rich in plant oil and low concentration of NDF induce the milk fat depression in mid-lactating cows.

Keywords

References

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Iranian Journal of animal Science
Volume 50, Issue 1
August 2019
Pages 11-21

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History

  • Receive Date: 04 February 2019
  • Revise Date: 06 April 2019
  • Accept Date: 27 April 2019

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