战略放牧管理降低了奶牛氮排泄强度

IF 2.6 3区 农林科学 Q1 Agricultural and Biological Sciences
C. D. Batalha, G. F. Congio, F. Santos, S. C. Silva
{"title":"战略放牧管理降低了奶牛氮排泄强度","authors":"C. D. Batalha, G. F. Congio, F. Santos, S. C. Silva","doi":"10.1590/1678-992X-2020-0251","DOIUrl":null,"url":null,"abstract":"ABSTRACT: There is limited information regarding both nitrogen (N) and energy partitioning of dairy cows grazing well–managed tropical pastures. The objective of this study was to investigate the N and energy partitioning of mid–lactation dairy cows on rotationally grazed elephant grass using two pre–grazing targets: 95 % or maximum canopy light interception (LI95% or LIMax) during regrowth. The study used 26 Holstein × Jersey dairy cows arranged in a randomized complete block design with three 40–day periods of sampling. Grazing at LI95% increased organic matter and crude protein intake by 20 % (p ≤ 0.05) which resulted in a 9 % increase in fat corrected milk yield (p ≤ 0.05) relative to LIMax. Cows grazing at LI95% had greater concentration of total volatile fatty acids, butyrate and valerate (p ≤ 0.05), and smaller acetate (p ≤ 0.05) than those grazing at LIMax. Intake of net energy for lactation (NEL) and NEL secreted in milk were greater (p ≤ 0.05), while partitioning of NEL towards maintenance tended to be greater (p = 0.07) for cows grazing at LI95% than those grazing at LIMax. Milk urea nitrogen and both urine and fecal N excretion were greater for cows grazing at LI95% (p ≤ 0.05), but N excretion intensity was lower than in cows grazing at LIMax (p ≤ 0.05). Strategic grazing management using the LI95% pre–grazing target increases N losses through both urine and feces; however, it reduces N excretion intensity of dairy cows by 9 %.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"79 1","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Strategic grazing management decreases nitrogen excretion intensity of dairy cows\",\"authors\":\"C. D. Batalha, G. F. Congio, F. Santos, S. C. Silva\",\"doi\":\"10.1590/1678-992X-2020-0251\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"ABSTRACT: There is limited information regarding both nitrogen (N) and energy partitioning of dairy cows grazing well–managed tropical pastures. The objective of this study was to investigate the N and energy partitioning of mid–lactation dairy cows on rotationally grazed elephant grass using two pre–grazing targets: 95 % or maximum canopy light interception (LI95% or LIMax) during regrowth. The study used 26 Holstein × Jersey dairy cows arranged in a randomized complete block design with three 40–day periods of sampling. Grazing at LI95% increased organic matter and crude protein intake by 20 % (p ≤ 0.05) which resulted in a 9 % increase in fat corrected milk yield (p ≤ 0.05) relative to LIMax. Cows grazing at LI95% had greater concentration of total volatile fatty acids, butyrate and valerate (p ≤ 0.05), and smaller acetate (p ≤ 0.05) than those grazing at LIMax. Intake of net energy for lactation (NEL) and NEL secreted in milk were greater (p ≤ 0.05), while partitioning of NEL towards maintenance tended to be greater (p = 0.07) for cows grazing at LI95% than those grazing at LIMax. Milk urea nitrogen and both urine and fecal N excretion were greater for cows grazing at LI95% (p ≤ 0.05), but N excretion intensity was lower than in cows grazing at LIMax (p ≤ 0.05). Strategic grazing management using the LI95% pre–grazing target increases N losses through both urine and feces; however, it reduces N excretion intensity of dairy cows by 9 %.\",\"PeriodicalId\":49559,\"journal\":{\"name\":\"Scientia Agricola\",\"volume\":\"79 1\",\"pages\":\"\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2022-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Scientia Agricola\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.1590/1678-992X-2020-0251\",\"RegionNum\":3,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Agricultural and Biological Sciences\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scientia Agricola","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1590/1678-992X-2020-0251","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Agricultural and Biological Sciences","Score":null,"Total":0}
引用次数: 0

摘要

摘要:在管理良好的热带牧场上放牧的奶牛,氮素和能量分配的相关信息有限。本研究旨在研究循环放牧象草对泌乳中期奶牛氮和能量分配的影响,采用两个放牧前指标:95%或最大冠层光拦截(LI95%或LIMax)。试验选用26头荷斯坦×泽西奶牛,采用完全随机区组设计,分3期采样,每期40 d。在LI95%水平上放牧可使有机质和粗蛋白质采食量提高20% (p≤0.05),脂肪校正产奶量较LIMax水平提高9% (p≤0.05)。LI95%水平放牧的奶牛总挥发性脂肪酸、丁酸盐和戊酸盐浓度高于(p≤0.05),乙酸盐浓度低于(p≤0.05)。泌乳净能采食量(NEL)和乳中分泌的NEL更大(p≤0.05),而在LI95%放牧的奶牛,NEL向维持的分配更大(p = 0.07)。LI95%放牧奶牛的乳尿素氮、尿氮和粪氮排泄量均高于LI95%放牧奶牛(p≤0.05),但氮排泄强度低于LIMax放牧奶牛(p≤0.05)。采用LI95%放牧前目标的战略放牧管理增加了通过尿液和粪便的氮损失;但可使奶牛氮排泄强度降低9%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strategic grazing management decreases nitrogen excretion intensity of dairy cows
ABSTRACT: There is limited information regarding both nitrogen (N) and energy partitioning of dairy cows grazing well–managed tropical pastures. The objective of this study was to investigate the N and energy partitioning of mid–lactation dairy cows on rotationally grazed elephant grass using two pre–grazing targets: 95 % or maximum canopy light interception (LI95% or LIMax) during regrowth. The study used 26 Holstein × Jersey dairy cows arranged in a randomized complete block design with three 40–day periods of sampling. Grazing at LI95% increased organic matter and crude protein intake by 20 % (p ≤ 0.05) which resulted in a 9 % increase in fat corrected milk yield (p ≤ 0.05) relative to LIMax. Cows grazing at LI95% had greater concentration of total volatile fatty acids, butyrate and valerate (p ≤ 0.05), and smaller acetate (p ≤ 0.05) than those grazing at LIMax. Intake of net energy for lactation (NEL) and NEL secreted in milk were greater (p ≤ 0.05), while partitioning of NEL towards maintenance tended to be greater (p = 0.07) for cows grazing at LI95% than those grazing at LIMax. Milk urea nitrogen and both urine and fecal N excretion were greater for cows grazing at LI95% (p ≤ 0.05), but N excretion intensity was lower than in cows grazing at LIMax (p ≤ 0.05). Strategic grazing management using the LI95% pre–grazing target increases N losses through both urine and feces; however, it reduces N excretion intensity of dairy cows by 9 %.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Scientia Agricola
Scientia Agricola 农林科学-农业综合
CiteScore
5.10
自引率
3.80%
发文量
78
审稿时长
18-36 weeks
期刊介绍: Scientia Agricola is a journal of the University of São Paulo edited at the Luiz de Queiroz campus in Piracicaba, a city in São Paulo state, southeastern Brazil. Scientia Agricola publishes original articles which contribute to the advancement of the agricultural, environmental and biological sciences.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信