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Zootecnia Tropical
Instituto Nacional de Investigaciones Agrícolas Venezuela
ISSN: 0798-7269
Vol. 26, No. 4, 2008, pp. 421-428
Bioline Code: zt08078
Full paper language: Spanish
Document type: Research Article
Document available free of charge

Zootecnia Tropical, Vol. 26, No. 4, 2008, pp. 421-428

 es Efecto de la suplementación con Saccharomyces cerevisiae check for this species in other resources sobre la producción de leche al inicio de la lactancia en vacas lecheras
Rivas, Jose; Díaz, Thais; Hahn, Martin & Bastidas, Pedro

Resumen

El objetivo fue evaluar el suministro estratégico de Saccharomyces cerevisiae check for this species in other resources (SC) en la dieta, al inicio de la lactancia sobre la producción de leche y grasa en vacas Holstein (H, n=41) y Carora (C; n=15) ubicadas en la zona alta de Mérida, Venezuela. Las vacas se distribuyeron al azar en dos tratamientos: un grupo experimental (GE; H=22 y C=8) que recibió 10 g/d de SC durante los primeros 105 d postparto (DPP) y un grupo control (GC; H=19 y C=7). La alimentación basal era el pastoreo de Pennisetum clandestinum check for this species in other resources y Panicum maximum check for this species in other resources , para las vacas H y C, respectivamente, y alimento concentrado (20% PC y 77% NDT) a razón de 1 kg/3 kg de leche. La producción de leche se registró semanalmente y la acumulada a los 35, 70 y 105 DPP. La proporción de grasa en la leche se obtuvo durante las primeras seis semanas. Los datos fueron analizados a través del análisis de la varianza de mínimos cuadrados, utilizando la prueba de Tukey para la comparación de medias. La producción de leche incrementó (P<0,05) 165 kg más en las vacas H del GE que en el GC a los 105 DPP. La producción de grasa a las 6 semanas fue mayor (3,4 kg) en las vacas H del GE que en el GC (35,5 vs. 32,0 kg, respectivamente). No se obtuvieron diferencias significativas en la producción de leche y grasa en las vacas C. Los resultados indican que el uso estratégico del SC durante los primeros 105 DPP mejora la producción de leche y grasa, quizás por la acción estimulante del SC en el rumen y la mayor disponibilidad de nutrientes por la glándula mamaria.

Palabras-clave
vacas lecheras, producción de leche, grasa, levaduras.

 
 en Effect of supplementation with Saccharomyces cerevisiae check for this species in other resources on milk production from onset of lactation in dairy cows
Rivas, Jose; Díaz, Thais; Hahn, Martin & Bastidas, Pedro

Abstract

The aim of this study was to determine the strategic use of Saccharomyces cerevisiae check for this species in other resources (SC) from onset of lactation and its effect on milk and fat production in Holstein (H) and Carora (C) cows located in the mountain area of Merida state, Venezuela. Forty-one H and fifteen C cows were assigned to two treatments: Experimental group (EG; H=22 and C=8) fed with 10 g/d of SC and Control group (CG; H=19 and C=7), which did not received any supplement for a period of 105 d postpartum (DPP). Carora cows grazed pastures of Panicum maximum check for this species in other resources , whereas H cows had access to pastures of Pennisetum clandestinum check for this species in other resources . All cows were fed at milking with a concentrate mixture (20% CP and 77% TND) at a ratio of 1 kg:3 kg of milk. Milk production was measured weekly during 15 weeks and fat milk during the first six weeks post calving. Data were analyzed by least squares means and comparison of subclass means were tested for significance using Tukey´s procedures. Milk yield was increased (P < 0.05) in H fed with SC, having 165 kg more of accumulated milk yield at 105 DPP than the CG. Also H cows with three or more calvings had higher (P<0.01) accumulated milk yield at 105 DPP (2544.6 ± 84.9 kg) than cows with 1 or 2 calvings (1916 ± 122.4 and 2227.7± 67.9 kg, respectively). There was not a treatment effect in milk yield in C cows. In Holstein cows treated with SC, the accumulated milk fat at six weeks postcalving was 3.4 kg greater compared to CG (35.5 ± 1.4 vs 32.0 ± 1.6 kg, respectively). Results from this study indicate that the strategic use of SC during the first 105 DPP, improved milk and fat yield in dairy cows perhaps by stimulating the action of yeast culture in the rumen and the availability of nutrients for the mammary gland.

Keywords
dairy cows, milk production, fat, yeast.

 
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