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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.23.0318    [Accepted] Published online April 1, 2024.
Effects of high moisture ear corn on production performance, milk fatty acid composition, serum antioxidant status, and immunity in primiparous dairy cows
Songlin Shang1  , Zheng Li1  , Jiajun Li1  , Xi Zhao2  , Wenjing Zhang Zhang1  , Xinrui Zhang1  , Jinni Bai1  , Zhiye Yang1  , Kaijun Guo1,* 
1College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China
2Beijing Institute of Feed Control, Beijing 100107, China
Correspondence:  Kaijun Guo, Tel: +86-010-80795593, Fax: +86-010-80795593, Email: kjguo126@126.com
Received: 23 August 2023   • Revised: 11 October 2023   • Accepted: 26 January 2024
Abstract
Objective
This study evaluated the effects of high moisture ear corn (HMEC) on production performance, milk fatty acid composition, serum antioxidant status, and immunity in primiparous dairy cows.
Methods
A total of 45 healthy primiparous Holstein cows (36.50±4.30 kg of milk/day, 201±9.00 lactating days in milk) were sorted into 3 groups: control group (CG, n = 15), 50% HMEC (replacing 50% steam-flaked corn with HMEC, n = 15), and 100% HMEC (replacing steam-flaked corn with HMEC, n = 15) on an equal dry matter (DM) basis. The study consisted of adaptation period of 14 days, followed by a formal period of 60 days. Feed intake and milk yield were recorded daily. Milk and blood samples were collected on 1, 30, and 60 d of the experimental period.
Results
The 50% HMEC group and 100% HMEC group significantly increased (p<0.05) milk yield and dry matter intake (DMI) in dairy cows compared to the control group (CG). The 100% HMEC group showed an increase (p<0.05) in 4% fat-corrected milk (4% FCM). Both the 50% HMEC group and 100% HMEC group exhibited significant decreases (p<0.05) in the content of C10:0, C12:0, and C14:0 fatty acids, along with a significant increase (p<0.05) in cis-9C18:1 content. The saturated fatty acid (SFA) content was significantly lower (p<0.05) in the 50% HMEC and 100% HMEC groups than that of CG. Conversely, the monounsaturated fatty acid (MUFA) content was higher (p<0.05) in the 50% HMEC and 100% HMEC groups than that in CG. Notably, the 100% HMEC group significantly increased (p<0.05) the serum superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) content, while also decreasing the serum malondialdehyde (MDA) content (p<0.05). Moreover, the 100% HMEC group significantly increased (p<0.05) the content of immunoglobulin G (IgG) and immunoglobulin M (IgM).
Conclusion
High moisture ear corn could improve production performance and milk fatty acid levels and enhance immunity and antioxidant capacity in dairy cows. These results lay the foundation for the wider application of HMEC in ruminant animal diets.
Keywords: Antioxidant Capacity; Dairy Cows; High Moisture Ear Corn; Immunity; Production Performance


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