Enrichment of chocolate byproducts and protected fats with zinc to partially replace corn in diets of early lactation Holstein cows

IF 1.8 4区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Mohammed H. Bakr, Moemen G. Abd Elazeim, A. E. R. M. Abd El Gawad, O. Olafadehan, A. E. Kholif
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引用次数: 2

Abstract

Abstract The present experiment aimed to evaluate the effect of partial replacement of corn with chocolate byproducts, protected fats, or their mixture supplemented with zinc in the diet of lactating cows on feed utilization and lactation performance for 90 days. Fifty multiparous Holstein cows (565±25 kg BW, 3±1 parity, 7±1 days in milk, and a previous milk production of 35±2.9 kg/d), were randomly assigned to 5 treatments in a completely randomized design. The control diet contained (per kg DM): 412 g concentrate feed mixture, 412 g corn silage, and 176 g berseem hay. The control diet was supplemented with 1 g of zinc daily (Zinc diet). In the other diets, each kg of crushed corn grain was replaced with (DM basis) 600 g chocolate byproducts (CH diet), 400 g protected fats (PF diet), or 500 g of chocolate byproducts and protected fats mixture (1:1 DM basis) (CHPF diet). Both amounts of protected fats and chocolate byproducts had the same energy concentration as 1 kg of corn. The total mixed ration was prepared and distributed using a horizontal mixer system after mixing for 20 min. Chemical analysis showed that the replacement minimally affected the composition of the total mixed rations. Additionally, treatments did not affect feed intake. Compared to the control treatment, the zinc treatment did not affect milk production, milk composition, or feed efficiency. Increased (P<0.05) daily production of milk and component yields, and feed efficiency as well as fat concentration were observed by the CH, PF and CHPF treatments. Without affecting other measured blood parameters or hematocrit, treatments increased (P<0.05) the concentrations of total proteins, albumin, glucose, cholesterol, triglyceride, and zinc in the blood of cows. Additionally, the CH, PF, and CHPF treatments increased (P<0.01) the digestibility of nutrients compared to the control treatment. It is concluded that the addition of zinc to the control did not affect cow performance; however, its addition to chocolate byproducts, protected fats, or their mixture to partially replace corn improved the performance of cows.
在泌乳早期荷斯坦奶牛饲粮中添加锌来部分替代玉米的巧克力副产品和保护性脂肪
摘要本试验旨在评价泌乳奶牛饲粮中以巧克力副产物、保护脂肪或其混合物加锌部分替代玉米对90 d饲料利用和泌乳性能的影响。选用50头体重为565±25 kg、胎次为3±1次、泌乳天数为7±1天、产奶量为35±2.9 kg/d的荷斯坦奶牛,采用完全随机设计,随机分为5个处理。对照日粮(每kg DM):精料混合物412 g,玉米青贮412 g,干草176 g。对照日粮中添加1 g锌(锌日粮)。在其他饲粮中,每千克碾碎的玉米籽粒被(DM基础)600 g巧克力副产物(CH饲粮)、400 g保护脂肪(PF饲粮)或500 g巧克力副产物和保护脂肪混合物(1:1 DM基础)(CHPF饲粮)替代。保护性脂肪和巧克力副产品的能量浓度与1公斤玉米的能量浓度相同。混合20 min后,利用卧式混合器系统配制和分配总混合口粮。化学分析表明,更换对总混合口粮的组成影响最小。此外,处理不影响采食量。与对照处理相比,锌处理不影响产奶量、奶成分或饲料效率。chf、PF和CHPF处理显著提高了日产奶量、各组分产量、饲料效率和脂肪浓度(P<0.05)。在不影响其他血液测量参数或红细胞压积的情况下,处理提高了奶牛血液中总蛋白、白蛋白、葡萄糖、胆固醇、甘油三酯和锌的浓度(P<0.05)。此外,与对照组相比,CH、PF和CHPF处理提高了营养物质的消化率(P<0.01)。由此可见,在对照组中添加锌对奶牛生产性能无影响;然而,添加巧克力副产品、保护性脂肪或它们的混合物来部分替代玉米,提高了奶牛的性能。
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来源期刊
Annals of Animal Science
Annals of Animal Science 农林科学-奶制品与动物科学
CiteScore
4.00
自引率
5.30%
发文量
138
审稿时长
6-12 weeks
期刊介绍: Annals of Animal Science accepts original papers and reviews from the different topics of animal science: genetic and farm animal breeding, the biology, physiology and reproduction of animals, animal nutrition and feedstuffs, environment, hygiene and animal production technology, quality of animal origin products, economics and the organization of animal production.
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