Energy to protein ratios in supplements for grazing heifers in the rainy season

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dc.creatorAlyce Raiana Monteiro dos Santos
dc.creatorCarla Heloísa Avelino Cabral
dc.creatorCarlos Eduardo Avelino Cabral
dc.creatorLivia Vieira de Barros
dc.creatorJackelliny Melo de Barros
dc.creatorWelton Batista Cabral
dc.creatorMilene Rodrigues Dias
dc.date.accessioned2023-05-08T18:49:31Z
dc.date.accessioned2025-09-09T00:32:50Z
dc.date.available2023-05-08T18:49:31Z
dc.date.issued2019
dc.identifier.doihttps://doi.org/10.1007/s11250-019-01953-8
dc.identifier.issn0049-4747
dc.identifier.urihttps://hdl.handle.net/1843/52923
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofTropical Animal Health and Production
dc.rightsAcesso Restrito
dc.subjectDesempenho
dc.subjectRuminante - Alimentação e rações
dc.subjectBovino
dc.subjectPastejo
dc.subject.otherIngestive behavior
dc.subject.otherNutritional characteristics
dc.subject.otherPerformance
dc.subject.otherRuminant nutrition
dc.titleEnergy to protein ratios in supplements for grazing heifers in the rainy season
dc.typeArtigo de periódico
local.citation.epage2403
local.citation.spage2395
local.citation.volume51
local.description.resumoThis study evaluated the effect of energy and protein supplementation on the nutritional characteristics, ingestive behavior, and productive performance in grazing heifers during the rainy season. Forty crossbred heifers (Nelore breed predominance) were used in the study, with an age of 14 months and an initial mean weight of 182 ± 1.13 kg. The treatments consisted of mineral supplementation ad libitum (control) and three supplements formulated to contain an energy: protein ratio (TDN:CP) of 1.13, 2.62, and 4.06; these were denominated as low (LC, 0.5 kg animal d−1), medium (MC, 1.0 kg animal d−1), and high consumption (HC, 1.5 kg animal d−1), respectively, in order to guarantee an intake of 300 g of crude protein (CP) animal−1 d −1, with variation in energy content. There was a difference (P < 0.05) in crude protein intake, with a 44% reduction for the LC treatment in relation to HC. The lowest grazing time (398 min) was observed with the MC treatment. Urinary urea-N (UreaN) was lower for control animals (P < 0.05). Average daily gain (ADG) was lower for the control animals than for the supplemented animals (P < 0.05); there was no difference in ADG between the animals receiving supplementation. High supplementation levels and TDN:CP ratios are not recommended because they do not justify the increased costs of supplementation. Therefore, when forage presents great nutritional characteristics, it is possible to optimize the performance of the animals with low to medium consumption supplementation.
local.publisher.countryBrasil
local.publisher.departmentICA - INSTITUTO DE CIÊNCIAS AGRÁRIAS
local.publisher.initialsUFMG
local.url.externahttps://link.springer.com/article/10.1007/s11250-019-01953-8

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