Effects of high moisture ear corn on production performance, milk fatty acid composition, serum antioxidant status, and immunity in primiparous dairy cows.

IF 2.4 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Bioscience Pub Date : 2024-04-01 DOI:10.5713/ab.23.0318

Songlin Shang, Zheng Li, Jiajun Li, Xi Zhao, Wenjing Zhang, Xinrui Zhang, Jinni Bai, Zhiye Yang, Kaijun Guo

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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.

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高水分玉米穗对初产奶牛生产性能、牛奶脂肪酸组成、血清抗氧化剂状态和免疫力的影响。

目的本研究评估了高水分玉米穗（HMEC）对初产奶牛生产性能、牛奶脂肪酸组成、血清抗氧化剂状态和免疫力的影响。方法将45头健康初产荷斯坦奶牛（36.50±4.在干物质（DM）相同的基础上，将 45 头健康初产荷斯坦奶牛（产奶量为 36.50±4.00kg/天，泌乳天数为 201±9.00）分为 3 组：对照组（CG，n = 15）、50% HMEC 组（用 HMEC 替代 50%蒸煮玉米，n = 15）和 100% HMEC 组（用 HMEC 替代蒸煮玉米，n = 15）。研究包括 14 天的适应期和 60 天的正式期。每天记录饲料摄入量和产奶量。与对照组（CG）相比，50% HMEC 组和 100% HMEC 组奶牛的产奶量和干物质摄入量（DMI）显著增加（p<0.05）。100% HMEC 组的 4% 脂肪校正奶（4% FCM）也有所增加（p<0.05）。50% HMEC 组和 100% HMEC 组的 C10:0、C12:0 和 C14:0 脂肪酸含量均显著下降（p<0.05），顺式-9C18:1 脂肪酸含量显著增加（p<0.05）。50% HMEC 组和 100% HMEC 组的饱和脂肪酸（SFA）含量明显低于 CG 组（p<0.05）。相反，50% HMEC 组和 100% HMEC 组的单不饱和脂肪酸（MUFA）含量高于 CG 组（p<0.05）。值得注意的是，100% HMEC 组的血清超氧化物歧化酶（SOD）和谷胱甘肽过氧化物酶（GSH-Px）含量明显增加（p<0.05），血清丙二醛（MDA）含量也有所下降（p<0.05）。此外，100% HMEC 组的免疫球蛋白 G (IgG) 和免疫球蛋白 M (IgM) 含量显著增加（p<0.05）。这些结果为高水分玉米在反刍动物日粮中的广泛应用奠定了基础。

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