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Effects of grazing management in brachiaria grass-forage peanut pastures on canopy structure and forage intake1.

التفاصيل البيبلوغرافية
العنوان: Effects of grazing management in brachiaria grass-forage peanut pastures on canopy structure and forage intake1.
المؤلفون: Gomes FK; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Oliveira MDBL; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Homem BGC; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Boddey RM; Embrapa Agrobiologia, Rodovia, Seropédica, Rio de Janeiro, Brazil., Bernardes TF; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Gionbelli MP; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Lara MAS; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Casagrande DR; Department of Animal Sciences, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil.
المصدر: Journal of animal science [J Anim Sci] 2018 Sep 07; Vol. 96 (9), pp. 3837-3849.
نوع المنشور: Journal Article; Randomized Controlled Trial, Veterinary
اللغة: English
بيانات الدورية: Publisher: American Society of Animal Science Country of Publication: United States NLM ID: 8003002 Publication Model: Print Cited Medium: Internet ISSN: 1525-3163 (Electronic) Linking ISSN: 00218812 NLM ISO Abbreviation: J Anim Sci Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Champaign, IL : American Society of Animal Science
مواضيع طبية MeSH: Fabaceae* , Nutritive Value* , Poaceae*, Animal Feed/*analysis , Animal Husbandry/*methods , Cattle/*physiology , Diet/*veterinary, Animal Nutritional Physiological Phenomena ; Animals ; Brazil ; Female ; Seasons
مستخلص: Maintenance of mixed grass-legume pastures for stand longevity and improved animal utilization is a challenge in warm-season climates. The goal of this study was to assess grazing management on stand persistence, forage intake, and N balance of beef heifers grazing mixed pastures of Brachiaria brizantha and Arachis pintoi. A 2-yr experiment was carried out in Brazil, where four grazing management were assessed: rest period interrupted at 90%, 95%, and 100% of light interception (LI) and a fixed rest period of 42 d (90LI, 95LI, 100LI, and 42D, respectively). The LI were taken at 50 points at ground level and at 5 points above the canopy for each paddock using a canopy analyzer. For all treatments, the postgrazing stubble height was 15 cm. Botanical composition and canopy structure characteristics such as canopy height, forage mass, and vertical distribution of the morphological composition were evaluated pre- and post-grazing. Forage chemical composition, intake, and microbial synthesis were also determined. A randomized complete block design was used, considering the season of the year as a repeated measure over time. Grazing management and season were considered fixed, while block and year were considered random effects. In the summer, legume mass accounted for 19% of the canopy at 100LI, which was less than other treatments (a mean of 30%). The 100LI treatment had a greater grass stem mass compared with other treatments. In terms of vertical distribution for 100LI, 38.6% of the stem mass was above the stubble height, greater than the 5.7% for other treatments. The canopy structure limited NDF intake (P = 0.007) at 100LI (1.02% of BW/d), whereas 42D, 90LI, and 95LI treatments had NDF intake close to 1.2% of BW/d. The intake of digestible OM (P = 0.007) and the ratio of CP/digestible OM (P < 0.001) were less at 100LI in relation to the other treatments. The production of microbial N (P < 0.001) and efficiency of microbial synthesis (P = 0.023) were greater at 95LI and 90LI, followed by 42D and less at 100LI. Overall, the range from 90% to 95% of LI is the recommendation to interrupt the rest period, since this strategy enhanced community stability, forage intake, and nutritional value of the diet. Under on-farm conditions, brachiaria grass and forage peanut pastures should be managed at a range height of 24 to 30 cm.
(© The Author(s) 2018. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
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فهرسة مساهمة: Keywords: Arachis pintoi; forage intake; legume; mixed pasture; palisadegrass
تواريخ الأحداث: Date Created: 20180615 Date Completed: 20200331 Latest Revision: 20200331
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC6127818
DOI: 10.1093/jas/sky236
PMID: 29901704
قاعدة البيانات: MEDLINE
الوصف
تدمد:1525-3163
DOI:10.1093/jas/sky236