Produção e análise marginal em vacas de leite submetidas a níveis de ureia na dieta à base de silagem de sorgo

Archivos de Zootecnia Pub Date : 2020-07-15 DOI:10.21071/az.v69i267.5349

R. H. Alves, H. S. Júnior, E. O. C. Santana, F. Mendes, G. A. Filho, P. T. Viana, L.A.P. Raduns, Bruno Weiss

{"title":"Produção e análise marginal em vacas de leite submetidas a níveis de ureia na dieta à base de silagem de sorgo","authors":"R. H. Alves, H. S. Júnior, E. O. C. Santana, F. Mendes, G. A. Filho, P. T. Viana, L.A.P. Raduns, Bruno Weiss","doi":"10.21071/az.v69i267.5349","DOIUrl":null,"url":null,"abstract":"The objective of this study was to evaluate productive, nutritional and economic traits of dairy cows fed sorghum silage diets with urea levels. Five ¾ Holstein × ¼ Gir lactating dairy cows in the middle third of lactation, at an average age of 60 months and average body weight of 518 kg ± 52 kg, were allocated to five treatments in a 5 × 5 Latin square experimental design. Treatments (U-50, U-75, U-100, U-125 and U-150) consisted of different urea levels in the concentrate (5.7, 8.6, 11.4, 14.3 and 17.1 g urea/kg concentrate, respectively). The significance level of 0.5 was adopted. Urea levels did not influence the feed intake, digestibility, or metabolic parameters of dairy cows. No significant differences were observed for 3.5% fat-corrected milk yield. Milk composition was not significantly affected. Gross revenue from the sale of milk was not significantly affected, averaging BRL 28.65. Marginal rate of return did not differ significantly. The different urea levels did not influence the dairy cows’ milk yield. In conclusion, urea can be included in the concentrate of sorghum silage diets for dairy cows at the levels of 5.7 to 17.1 g/kg of concentrate without compromising production performance.","PeriodicalId":40003,"journal":{"name":"Archivos de Zootecnia","volume":"69 1","pages":"300-309"},"PeriodicalIF":0.0000,"publicationDate":"2020-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Archivos de Zootecnia","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.21071/az.v69i267.5349","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

The objective of this study was to evaluate productive, nutritional and economic traits of dairy cows fed sorghum silage diets with urea levels. Five ¾ Holstein × ¼ Gir lactating dairy cows in the middle third of lactation, at an average age of 60 months and average body weight of 518 kg ± 52 kg, were allocated to five treatments in a 5 × 5 Latin square experimental design. Treatments (U-50, U-75, U-100, U-125 and U-150) consisted of different urea levels in the concentrate (5.7, 8.6, 11.4, 14.3 and 17.1 g urea/kg concentrate, respectively). The significance level of 0.5 was adopted. Urea levels did not influence the feed intake, digestibility, or metabolic parameters of dairy cows. No significant differences were observed for 3.5% fat-corrected milk yield. Milk composition was not significantly affected. Gross revenue from the sale of milk was not significantly affected, averaging BRL 28.65. Marginal rate of return did not differ significantly. The different urea levels did not influence the dairy cows’ milk yield. In conclusion, urea can be included in the concentrate of sorghum silage diets for dairy cows at the levels of 5.7 to 17.1 g/kg of concentrate without compromising production performance.

查看原文本刊更多论文

基于高粱青贮饲料的日粮中尿素水平对奶牛产量和边际分析

本研究的目的是评估在尿素水平下饲喂高粱青贮饲料的奶牛的生产、营养和经济性状。在5×5拉丁方实验设计中，将5头处于哺乳期中间三分之一的¾荷斯坦×¼Gir泌乳奶牛分配给5个处理，平均年龄60个月，平均体重518 kg±52 kg。处理（U-50、U-75、U-100、U-125和U-150）包括浓缩物中不同的尿素水平（分别为5.7、8.6、11.4、14.3和17.1克尿素/kg浓缩物）。采用了0.5的显著性水平。尿素水平不会影响奶牛的采食量、消化率或代谢参数。3.5%脂肪校正的产奶量没有观察到显著差异。牛奶成分没有受到显著影响。牛奶销售的总收入没有受到显著影响，平均28.65巴西雷亚尔。边际收益率没有显著差异。不同尿素水平对奶牛产奶量没有影响。总之，在不影响生产性能的情况下，奶牛高粱青贮饲料的浓缩物中可以含有5.7至17.1 g/kg浓缩物的尿素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Archivos de Zootecnia Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

0.50

自引率

0.00%

发文量

期刊介绍： Archivos de Zootecnia is a quarterly, multilingual, international science journal, published by the University of Cordoba and the Asociación Iberoamericana de Zootecnia. The journal was founded in 1952 as the voice for the Zootechnics Institute of the Veterinary Faculty at the University of Cordoba. Its aim is to disseminate results from research into animal production and related areas, giving special attention to farming systems in developing areas, their local breeds and alternative production methods.