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      Efectos de métodos de pastoreo sobre sabanas moduladas: III. Cambios de peso de novillos Translated title: Effect of grazing methods on modulated savannas: III. Weight changes of steers

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          Abstract

          El estudio fue desarrollado en el Módulo Experimental de Mantecal, Estado Apure, Venezuela (7°35’ N y 69°10’ O), durante el período 1984-1998, con el objetivo de evaluar la dinámica de cambios de peso de novillos sobre sabanas hiperestacionales con 5 meses de déficit hídrico y 5 meses de exceso de humedad. Se asignaron 200 ha con similares proporciones altas, medias y bajas del módulo por tratamiento de: Pastoreo Continuo (PC), Pastoreo Diferido (PD) o utilización de las zonas altas durante las fuertes lluvias, las zonas medias en la transición lluvia-sequía y sequía-lluvia, y las zonas bajas durante la sequía; y Pastoreo Diferido Rotativo (PDR), con similar uso al PD pero con tres y seis subdivisiones en su zona media y baja, respectivamente. La carga animal promedio fue de 0.5 UA/ha, establecida por un rebaño de vientres pastoreadores y 12 novillos de 220 kg de peso inicial, con cambio anual y pesadas cada 45 días. Los datos se agruparon en los períodos 1984-1989; 1990-1995 y 1997-1998, considerando mes de pesaje, y fueron analizados como completamente aleatorizados. Durante los períodos evaluados no hubo diferencias significativas entre tratamientos en el peso final de los animales, representando en promedio 85 kg/an y 48 kg/ha/año, para el primer período. En el segundo período se obtuvo 80,3; 76,8 y 88,7 kg/an y 37,7; 35,3 y 42,6 kg/ha/año en PC, PD y PDR, respectivamente. Durante 1997-1998 las producciones fueron 121,1; 94,0 y 109,8 kg/an y 46; 36 y 42 kg/ha/año, en el mismo orden de tratamientos. En todos los casos, los animales sometidos a PC perdieron peso por período más prolongado y en forma significativa (P<0,05) al comparar contra PD, durante la sequía. Similarmente entre PD y PDR; cuando este último tendió a mantener su peso, por lo que resultó más eficiente para enfrentar la sequía.

          Translated abstract

          The research was carried out in the Experimental Module at Mantecal, Apure state, Venezuela (7º35’ N and 69º10’ W), during the period 1984-1998, with the objective to evaluate the dynamic of weight changes of steers on hyperstational savannas with 5 months of water deficit and 5 months of excess of humidity. Two hundred hectares were assigned with similar proportions of upper, medium, and lower physiographic positions in the module to the following treatments: Continuous Grazing (CG), Deferred Grazing (DG) as the use of upper areas during the peak of the rainy season, the medium areas in the transition period rain-dry and dry-rain, and the lower areas during the dry period; and Deferred-Rotary Grazing (DRG) with similar grazing management than DG, but with three and six subdivisions in their medium and lower areas, respectively. The mean stocking rate was 0.50 AU/ha, constituted by herd cows and 12 steers of 220 kg of initial weight, which were changed annually and weighted every 45 days. Data were grouped in 1984-1989; 1990-1995, and 1997-1998 periods, considering the month of weight and analyzed as a completely random design. During the evaluated periods, there was not a significantly difference among treatments in the final animal weights. The mean weight was 85 kg/anim. and 48 kg/ha/year for first period. In the second period, it was 80.3; 76.8, and 88.7 kg/anim. and 37.7, 35.3 and 42.6 kg/ha/year in CG, DG, and DRG, respectively. During 1997 to1998 the productions were 121.1, 94.0, and 109.8 kg/anim. and 46; 36, and 42 kg/ha/year, in above order of treatments. At all times, the animals under CG lost weight for longest periods and significantly (P<0.50) than in DG, during dry season. Similarity between DG and DRG, when the later had a tendency to maintain the weight, resulting in greater efficiency in the dry period.

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          Reproduction in continuously underfed Brahman cows

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            The influence of undernutrition on reproduction in the cow

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              Effect of nutrition: Age and size on compensatory growth in two breeds of steers

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                Author and article information

                Journal
                zt
                Zootecnia Tropical
                Zootecnia Trop.
                Instituto Nacional de Investigaciones Agricolas INIA, Maracay, Venezuela. (Maracay, Aragua, Venezuela )
                0798-7269
                2004
                : 22
                : 4
                : 333-346
                Affiliations
                [02] Maracay Aragua orgnameUniversidad Central de Venezuela orgdiv1Facultad de Ciencias Veterinarias Venezuela
                [01] San Fernando de Apure Apure orgnameInstituto Nacional de Investigaciones Agrícolas orgdiv1Estación Experimental Apure Venezuela grtorres@ 123456inia.gov.ve
                [03] Maracay Aragua orgnameInstituto Nacional de Investigaciones Agrícolas orgdiv1Centro Nacional de Investigaciones Agropecuarias Venezuela
                Article
                S0798-72692004000400003 S0798-7269(04)02200403
                d653bf6c-fc67-475a-9f8a-951145cc565d

                http://creativecommons.org/licenses/by/4.0/

                History
                : 08 June 2004
                : 03 November 2004
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 18, Pages: 14
                Product

                SciELO Venezuela

                Categories
                Artículos Científicos

                sabana,métodos de pastoreo,novillos,peso,savannas,grazing methods,steer,weight

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