04650nab a2200337 a 4500003000900000005001700009008004100026100002900067700003100096700003600127700003500163700002700198700003500225245014100260264000900401300001600410520355800426650001703984650002104001650002804022650002504050650003104075650003604106650002204142773006204164942000804226035001704234001000704251999001904258040003504277AR-ReUNN20260702002303.0260630s2007    ag |||||||||||||||||spa  1 aBalbuena, Osvaldo9649361 aSlanac, Alcides L.91221231 aKucseva, César Daniel91241361 aStahringer, Rodolfo C.91225361 aCardozo, S. M.91258091 aNavamuel, Juan Marcelo912208610aSilaje de grano de sorgo húmedo con y sin urea o semilla de algodón como suplemento invernal en vaquillas / O. Balbuena ... [et al.] 1c2007  a4 páginas  aResumen:   Para comparar el valor alimenticio del silaje de grano de sorgo húmedo con y sin urea o semilla de algodón para la recría de vaquillas en condiciones de pastoreo, se realizó un ensayo de suplementación invernal en potreros de Dichantium caricosum (2,25 animales/ha). Se utilizaron vaquillas cruza de 180 kg PV, clasificadas por fenotipo (tipos cebú o británico), que fueron asignadas aleatorizadamente a cuatro lotes, según recibieran (durante 6 días por semana durante 6 meses) silaje de grano de sorgo húmedo (SH, n = 10); SH + semilla entera de algodón (SH+SA, n = 16); SH + urea (SH+U, n = 16) o ningún suplemento (testigos, n = 10). Los suplementos fueron iso-energéticos y aportaron 3 Mcal EM /vez (2,6 Mcal EM /vaquilla/día). Los contenidos de proteína bruta fueron de 9% (SH) y 14,6% (SH+SA y SH+U). Mensualmente se registraron los pesos (con y sin desbaste), condición corporal (escala 1-9), altura a la cadera y perímetro torácico, así como las concentraciones séricas de nitrógeno ureico y proteínas totales. Los datos obtenidos se analizaron mediante el procedimiento GLM del programa SAS, bajo un modelo que incluyó: tratamiento, tipo y tratamiento x tipo, tomándose al animal como unidad experimental. Las vaquillas SH+SA registraron mayores ganancias de peso que el resto, en tanto que la ganancia de todos los animales suplementados aventajó a la de los testigos. La mejor evolución observada en SH+U comparada con SH se registró en julio-agosto, en coincidencia con la mayor concentración sérica de nitrógeno ureico en SH+U. Las proteínas séricas totales no fueron afectadas por los tratamientos. La mejor respuesta productiva se registró al utilizar semilla de algodón como fuente proteica.  Abstract:  To compare the feeding value of high moisture sorghum grain silage used alone or together with whole cottonseed or urea, an experiment of winter supplementation under pasture conditions, was carried out. Weaned heifers of 180 kg BW were used. Heifers were classified by phenotype (Zebu and British types) and randomly assigned to four treatments. They were kept on Dichantium caricosum pastures, at a stocking rate of 2.25 heifers/ha. Treatments were: a) high moisture sorghum grain alone (HMS, n=10); b) HMS+whole cottonseed (HMS+WCS, n=16); c) HMS+urea (HMS+U, n=16) and d) Control without supplementation (CON, n=10). Supplements were offered six times a week during 6 months and they were iso-energetic (3 Mcal ME per time offered, equivalent to 2.6 Mcal ME per heifer/day). Supplement CP were: 9% (HMS) and 14.6% (HMS+WCS and HMS+U). Shrunk body weight, body condition score (1-9 scale), thoracic perimeter, and hip height were taken at the beginning and the end of the experiment. Monthly, full body weigh and blood from jugular vein were obtained. Serum urea nitrogen and total protein concentration were determined. Response variables were analyzed using the GLM procedure of SAS program, using the animal as the experimental unit. The model included treatment, phenotype and their interaction. Heifers from treatment HMS+WCS had higher average body weight gain than the others. All supplements improved average body weight gain over CON. Heifers from treatment HMS+U performed better than HMS during July and August, which was consistent with higher plasma urea nitrogen in heifers from HMS+U. Total protein serum concentrations were not affected by treatments. The best production response was observed when WCS was used as the protein source. 4aVaca9115966 4aVaquilla9124099 4aSilaje de Grano9125810 4aSorgo Humedo9125811 4aSemilla de Algodon9117007 4aSuplementación Animal9118003 4aInvernada91241850 tRevista Veterinariax1668-4834gv. 16 n. 2 (2005)w217547  cART  a(AGROP)41102217730  c217730d217730  aAR-ReUNNbspacAR-ReUNNeaacr2