Feed intake, milk production, and nutrient use efficiency with early lactating Norwegian Red dairy cows fed concentrates with varying levels of local ingredients

IF 1.9 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
K.S. Eikanger , M. Eknæs , J.K. Sommerseth , I.J. Karlengen , I. Schei , M. Silberberg , A. Kidane
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Abstract

We evaluated the effects of replacing imported soya protein and carbohydrate ingredients in concentrate feeds with alkalised barley in dairy cow diets with grass silage as a basal diet. Eight multiparous early lactation Norwegian Red dairy (NRF) cows with an initial daily milk yield (MY±SD) of 30.5 ± 5.94 kg were used in a 4 × 4 replicated Latin square design experiment of four 35-day experimental periods. Four roughly isonitrogenous and isoenergetic diets were included: a positive control with a higher share of imported ingredients, including soya as a protein source (Soya-F), two concentrates including alkalised barley (Alka-diets), differing in pre-pelleting particle size (i.e., Alka fine = Alka-F, and Alka coarse = Alka-C), and a negative control with the same basal ingredients as the Alka-diets but with untreated barley and added feed-grade urea replacing the alkalised barley (Urea-F). Grass silage was offered ad libitum and concentrate requirement for individual cows was calculated based on Soya-F. The Soya-F was then quantitatively replaced by the other three concentrate feeds. Feed intake, nutrient digestibility, milk production, nutrient use efficiency, and serum metabolites were measured. Replacing Soya-F with Alka-diets did not affect feed intake, digestibility, and milk production. However, Alka-diets supported a greater milk yield than Urea-F, which in turn improved feed utilisation efficiency for Alka-diets without altered N efficiency. A coarser pre-pelleting structure of Alka-C resulted in a lower starch digestibility compared to Alka-F. In conclusion, alkaline-treated barley has the potential to replace soya in concentrates for NRF dairy cows without compromising production efficiency.
挪威红奶牛采食量、产奶量和营养物质利用效率的研究
本研究评估了以草料青贮为基础日粮的奶牛饲粮中用碱化大麦替代浓缩饲料中进口大豆蛋白和碳水化合物成分的效果。选取8头初始日产奶量(MY±SD)为30.5±5.94 kg的多产早期泌乳挪威红奶牛,进行4 × 4重复拉丁方设计试验,试验期为4个35 d。包括四种大致等氮和等能的饲粮:阳性对照,进口成分的比例较高,包括大豆作为蛋白质来源(大豆- f);两种浓缩物,包括碱化大麦(碱化大麦饲粮),预颗粒大小不同(即,碱细= Alka- f,碱粗= Alka- c);阴性对照,与碱化大麦饲粮的基础成分相同,但未经处理的大麦和添加饲料级尿素代替碱化大麦(尿素- f)。以大豆- f为基础,计算单头奶牛的精料需要量。然后用其他三种浓缩饲料定量替代大豆- f。测定采食量、营养物质消化率、产奶量、营养物质利用效率和血清代谢产物。用alka日粮代替大豆f对采食量、消化率和产奶量没有影响。然而,与尿素- f相比,alka饲粮支持更高的产奶量,这反过来提高了alka饲粮的饲料利用效率,而不改变氮的效率。与Alka-F相比,Alka-C较粗的预制粒结构导致淀粉消化率较低。综上所述,碱处理大麦有潜力在不影响生产效率的情况下替代非rf奶牛精料中的大豆。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Livestock Science
Livestock Science 农林科学-奶制品与动物科学
CiteScore
4.30
自引率
5.60%
发文量
237
审稿时长
3 months
期刊介绍: Livestock Science promotes the sound development of the livestock sector by publishing original, peer-reviewed research and review articles covering all aspects of this broad field. The journal welcomes submissions on the avant-garde areas of animal genetics, breeding, growth, reproduction, nutrition, physiology, and behaviour in addition to genetic resources, welfare, ethics, health, management and production systems. The high-quality content of this journal reflects the truly international nature of this broad area of research.
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