Effects of the inclusion of a rumen-protected B-vitamin blend and hydroxy trace minerals in the diets of confined Nellore cattle on performance and cecal and ruminal histology

IF 2.7 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Feed Science and Technology Pub Date : 2025-07-23 DOI:10.1016/j.anifeedsci.2025.116448

Maria Carolina Gonçalves de Arruda , Rodrigo de Nazaré Santos Torres , Daniela Bernadete Rozza , Luis Arthur Loyola Chardulo , Welder Angelo Baldassini , Rogério Abdallah Curi , Guilherme Luis Pereira , Iasmin Myrele Santos Calaça de Farias , Marco Aurélio Porcionato , Otávio Rodrigues Machado Neto

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Abstract

Increasing grain inclusion in the diets of feedlot cattle is associated with elevated oxidative stress, which may affect performance and meat quality. In this context, the objective was to evaluate the effects of supplementing rumen-protected B-complex vitamins and hydroxy trace minerals (HTM), specifically Cu and Zn (VitB+HTM(Cu+Zn)), in the diets of confined Nellore cattle fed different starch levels on performance, carcass traits, meat quality, cecal histopathology, and rumen health. The experimental followed a randomized block design in a 2 × 2 factorial arrangement, with two factors: starch level (high or low) and the inclusion of VitB+HTM(Cu+Zn). The finishing period was divided into two phases. In the first phase (days 1–55) 120 Nellore bulls were allocated to two treatments: high starch (HS) and high starch with VitB+HTM(Cu+Zn) (HSVI). In the second phase (days 56–108), half of the animals were switched to a low-starch diet, resulting in four treatment groups: high starch (HS), high starch with VitB+HTM(Cu+Zn) (HSVI), low starch (LS), and low starch with VitB+HTM(Cu+Zn) (LSVI). The inclusion of VitB+HTM(Cu+Zn) had no effect (P > 0.05) on feed intake or performance during both the first phase (days 1–55) and the second phase (days 56–108) of feedlot finishing. However, over the entire finishing period (108 days), animals fed a high-starch diet showed improved feed efficiency (P = 0.010), increased thickness of the keratinized epithelium (P = 0.051), and reduced drip loss (P = 0.023) and cooking loss (P = 0.042) in meat, along with a reduction in papilla surface area (P = 0.001). The inclusion of VitB+HTM(Cu+Zn) in the diet increased papilla width (P = 0.051) in both high- and low-starch diets and improved meat color in animals fed low-starch diets. Supplementation with VitB+HTM(Cu+Zn) did not affect the histopathological parameters of the cecum in confined Nellore cattle fed diets with different levels of starch. However, VitB+HTM(Cu+Zn) supplementation improved meat quality in animals fed low-starch diets and enhanced rumen health in confined Nellore cattle.

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饲粮中添加保护瘤胃的b族维生素混合物和羟基微量矿物质对内洛尔牛生产性能、盲肠和瘤胃组织的影响

饲粮中谷物含量的增加与氧化应激升高有关，这可能影响生产性能和肉品质。本试验旨在评价饲粮中添加不同淀粉水平的保护瘤胃复合b族维生素和羟基微量矿物质（HTM），特别是Cu和Zn （VitB+HTM(Cu+Zn)）对Nellore牛生产性能、胴体性状、肉品质、盲肠组织病理学和瘤胃健康的影响。试验采用2 × 2因子随机区组设计，包括淀粉水平（高或低）和VitB+HTM（Cu+Zn）的包合。收尾阶段分为两个阶段。在第一阶段（第1 ~ 55天），将120头Nellore公牛分为高淀粉（HS）和高淀粉+维生素b +HTM(Cu+Zn) （HSVI）处理。在第二阶段（第56-108天），一半的动物改为低淀粉饮食，分为四个处理组：高淀粉（HS）、高淀粉含维生素b +HTM(Cu+Zn) （HSVI）、低淀粉（LS）和低淀粉含维生素b +HTM(Cu+Zn) （LSVI）。饲粮中添加VitB+HTM（Cu+Zn）对育肥第一阶段（第1 ~ 55天）和第二阶段（第56 ~ 108天）采食量和生产性能均无显著影响（P >； 0.05）。然而,在整个加工周期(108天),动物美联储high-starch饮食显示提高饲料效率(P = 0.010),增加的厚度的角质化上皮(P = 0.051),并降低滴损失(P = 0.023)和烹饪损失(P = 0.042)肉,以及减少乳头表面面积(P = 0.001)。饲粮中添加维生素b +HTM（Cu+Zn）增加了高、低淀粉饲粮的乳突宽度（P = 0.051），改善了低淀粉饲粮的肉色。饲粮中添加不同淀粉水平的维生素b +HTM（Cu+Zn）对内洛牛盲肠的组织病理学参数没有影响。然而，饲粮中添加维生素b +HTM（Cu+Zn）改善了低淀粉饲粮动物的肉品质，并改善了内洛牛的瘤胃健康。

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来源期刊

Animal Feed Science and Technology 农林科学-奶制品与动物科学

CiteScore

6.00

自引率

6.20%

发文量

266

审稿时长

3 months

期刊介绍： Animal Feed Science and Technology is a unique journal publishing scientific papers of international interest focusing on animal feeds and their feeding. Papers describing research on feed for ruminants and non-ruminants, including poultry, horses, companion animals and aquatic animals, are welcome. The journal covers the following areas: Nutritive value of feeds (e.g., assessment, improvement) Methods of conserving and processing feeds that affect their nutritional value Agronomic and climatic factors influencing the nutritive value of feeds Utilization of feeds and the improvement of such Metabolic, production, reproduction and health responses, as well as potential environmental impacts, of diet inputs and feed technologies (e.g., feeds, feed additives, feed components, mycotoxins) Mathematical models relating directly to animal-feed interactions Analytical and experimental methods for feed evaluation Environmental impacts of feed technologies in animal production.