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Rodriguez I.,Instituto Nacional Of Investigaciones Agricolas Inia Anzoategui | Bertorelli M.V.,Instituto Nacional Of Investigaciones Agricolas Inia Anzoategui | Gonzalez S.,Instituto Nacional Of Investigaciones Agricolas Inia Anzoategui | Arnal E.,Instituto Nacional Of Investigaciones Agricolas Inia Ceniap
Zootecnia Tropical | Year: 2014

Research in well-drained savanna grasslands has selected forage materials adaptable to a variety of livestock systems, tolerant to the damage of pests and diseases that affect the productivity and persistence of pastures. These include Mulato I, hybrid of Brachiaria ruziziensis with B. brizantha, introduced in 2002 in INIA-Anzoátegui. In a plot with a year of establishment, an area was demarcated in a randomized complete block design and four replications, to evaluate the effect of age cuts to in 3, 6 and 9 weeks, on dry matter production, land cover, plant height, number of tillers, crude protein and minerals contents (% PC, P, K, Ca and Mg). The higher dry matter production (4448,8 kg MS/ha), with higher crude protein and minerals contents (PC:14,0; P: 0,23; K: 2,85; Ca: 2,80; Mg: 1,57), was obtained with cuts made every 3 weeks. In 2004 severe attacks of a scale identified as Duplachionaspis sp. were recorded, considered as a new pest species for the pasture, observing damages of 100 % from mid-April to early June, decreasing progressively until early July, without compromising the persistence of grass. © 2014,Instituto Nacional de Investigaciones Agricolas (INIA). All rights reserved. Source


Olivares B.O.,Instituto Nacional Of Investigaciones Agricolas Inia Anzoategui | Guevara E.,Instituto Nacional Of Investigaciones Agricolas Inia Anzoategui | Lopez L.,Bolivarian University of Venezuela
Zootecnia Tropical | Year: 2013

The productive activity of animals is affected by the prevailing weather conditions in any area, the temperature and humidity are considereted as the most infl uential factors. The aim of this study was to estimate the thermal comfort index (THI) in the Guanipa plateau to improve understanding of the problem causing heat stress to livestock production in the area. Temperature and humidity index (THI) THI: (1.8 *Ta + 32)-(0.55-0.55*HR/100)*(1.8*Ta-26) at 8:00 am and 2:00 pm were calculated. Daily and monthly weather data from agrometeorological station “El Tigre” were used and the frequency of THI was determined monthly. The results showed average values above the critical limit for milk production and alert condition for birds in the months of the dry season (February and March) and the rainy season (October and November). The ITH at 8:00 am was below the critical level (> 71). Daily values of ITH (> 79) located in the hazardous condition, where no comfort requirements which may increase mortality by heat stress in birds. The results indicate that it is necessary to take precautions in handling and breeding systems in both cattle and poultry. © 2013, Instituto Nacional de Investigaciones Agricolas (INIA). All Rights Reserved. Source

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