Mostrar el registro sencillo del objeto digital Nursoy, Hüseyin González Ronquillo, Manuel Faciola, Antonio Broderick, Glen
dc.creator Nursoy, Hüseyin;#0000-0002-5524-2459
dc.creator González Ronquillo, Manuel; 26128
dc.creator Faciola, Antonio;#0000-0003-0935-6233
dc.creator Broderick, Glen;#0000-0002-3466-9728 2018-03-06T16:16:22Z 2018-03-06T16:16:22Z 2018-02-01
dc.identifier.issn 0022-0302
dc.description Produccion de leche en vacas suplementadas con metionina condiferentes niveles de proteina es
dc.description.abstract Corn silage, an important forage fed to dairy cows in the United States, is energy rich but protein poor. The objectives of this experiment were to investigate the effects on production of milk and milk components of feeding corn silage-based diets with 4 levels of dietary crude protein (CP) plus rumen-protected methionine (RPM). Thirty-six cows were blocked by days in milk into 9 squares and randomly assigned to 9 balanced 4 × 4 Latin squares with four 4-wk periods. All diets were formulated to contain, as a percent of dry matter (DM), 50% corn silage, 10% alfalfa silage, 4% soyhulls, 2.4% mineral-vitamin supplement, and 30% neutral detergent fiber. Supplemental RPM (Mepron, Evonik Corp., Kennesaw, GA) was added to all diets to main- tain a Lys:Met ratio of 3.1 in digested AA. Ground high-moisture corn was reduced and soybean meal (SBM) plus RPM increased to give diets containing, on average, 11% CP (28% corn, 31% starch, 6% SBM, 4 g of RPM/d), 13% CP (23% corn, 29% starch, 10% SBM, 8 g of RPM/d), 15% CP (19% corn, 26% starch, 15% SBM, 10 g of RPM/d), and 17% CP (14% corn, 24% starch, 19% SBM, 12 g of RPM/d). Data from the last 14 d of each period were analyzed using the mixed pro- cedures in SAS (SAS Institute Inc., Cary, NC). With the exception of milk fat and milk lactose content, we found no significant effects of diet on all production traits. We did note linear responses to dietary CP concentration for intake, production of milk and milk components, and MUN. Cows fed the 11% CP diet had reduced DM intake, lost weight, and yielded less milk and milk components. Mean separation indicated that only true protein yield was lower on 13% CP than on 17% dietary CP, but not different between 15 and 17% CP. This indicated no improvement in production of milk and milk components above 15% CP. Quadratic trends for yield of milk, energy-corrected milk, and true protein suggested that a dietary CP concentration greater than 15% may be necessary to maximize pro- duction or, alternately, that a plateau was reached and no further CP was required. Although diet influenced apparent digestibility of DM, organic matter, and neutral detergent fiber, digestibility did not increase linearly with dietary CP. However, we observed linear and quadratic effects of dietary CP on acid detergent fiber digestibility. As expected, we found a linear ef- fect of dietary CP on apparent N digestibility and on fecal and urinary N excretion, but no effect of diet on estimated true N digestibility. Ruminal concentrations of ammonia, total AA, peptides, and branched-chain volatile fatty acids also increased linearly with dietary CP. Quadratic responses indicated that 14.0 to 14.8% CP was necessary to optimize digestion and energy utilization. Overall results indicated that, when RPM was added to increase Lys:Met to 3.1, 15% CP was adequate for lactating dairy cows fed corn silage diets supplemented with SBM and secreting about 40 kg of milk/d; N excretion was lower than at 17% CP but with no reduction in yield of milk and milk components. Key words: corn silage, soybean meal, rumen- protected methionine, dietary crude protein. es
dc.description.sponsorship The authors thank Jim Meronek and his barn crew for feeding and animal care during this trial at the US Dairy Forage Research Center Farm (Prairie du Sac, WI); Wendy Radloff and Mary Becker of the US Dairy Forage Research Center (Madison, WI) for sampling and laboratory analyses; Maria Åkerlind of Växa, Up- psala, Sweden, for assisting with NorFor diet computa- tions; and Peter Crump and Murray Clayton of the University of Wisconsin-Madison for assisting with statistical analyses. H. Nursoy gratefully acknowledges a scholarship from TUBITAK in Turkey. M. Gonzalez Ronquillo was granted funding from a Fulbright-Garcia Robles scholarship and from the Universidad Autonoma del Estado de Mexico. es
dc.language.iso eng es
dc.publisher Journal of Dairy Science es
dc.relation.ispartofseries Journal of Dairy Science. 101:2084-2095;
dc.rights openAccess es
dc.subject corn silage es
dc.subject soybean meal es
dc.subject rumen-protected methionine es
dc.subject dietary crude protein es
dc.subject.classification BIOLOGÍA Y QUÍMICA
dc.title Lactation response to soybean meal and rumen-protected methionine supplementation of corn silage-based diets es
dc.type Artículo es
dc.provenance Científica es
dc.road Dorada es
dc.organismo Medicina Veterinaria y Zootecnia es
dc.ambito Internacional es
dc.audience students es
dc.audience researchers es
dc.type.conacyt article
dc.identificator 2

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  • Título
  • Lactation response to soybean meal and rumen-protected methionine supplementation of corn silage-based diets
  • Autor
  • Nursoy, Hüseyin
  • González Ronquillo, Manuel
  • Faciola, Antonio
  • Broderick, Glen
  • Fecha de publicación
  • 2018-02-01
  • Editor
  • Journal of Dairy Science
  • Tipo de documento
  • Artículo
  • Palabras clave
  • corn silage
  • soybean meal
  • rumen-protected methionine
  • dietary crude protein
  • Los documentos depositados en el Repositorio Institucional de la Universidad Autónoma del Estado de México se encuentran a disposición en Acceso Abierto bajo la licencia Creative Commons: Atribución-NoComercial-SinDerivar 4.0 Internacional (CC BY-NC-ND 4.0)

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