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Characterization of Lay Phase in Three Genetic Types of Heavy Broilers Breeder in Tropical Conditions

Journal of Agricultural Science and Technology(A) 2013年第10期3卷 766-774页

作者： Jose Angel Miguel Edilberto Acevedo jesus ciria Begona Asenjo Escuela de lngenierias Agrarias de Sofia Campus Universitario s/n Universidad de Valladolid Sofia 42004 Espana Avenida Universidad Universidad Nacional Experimental del Tdtchira San Crist6bal Estado T(tchira 87225 Venezuela

The objective of the present work is characterizing some parameters in the lay phase in the lines of heavy broilers breeder Cobb Avian 48, Arbor Acres Plus and Ross 208, reared under the same commercial conditions in the tropics. Monitored three batches of approximately 18,000 females each （one for each genetic type）, from weeks 24 to 64, according to the conditions of handling and power described by the generic lines distribution companies. Although no differences were found for feed intake, Cobb Avian was presented a lower rate of feed conversion, being also that presented the highest percentage of implementation and production of incubables eggs, which meant that it was in line with the highest cumulative production of chickens by bird and week for tropical conditions studied. To adjust the lay data to a Gorssman model, in order to predict the parameters that characterize the lay modeling, estimated the best behavior for Cobb Avian 48 females, because while it takes more time to reach the level of putting constant （5.30 weeks） and maintain it for less time （2.4 weeks）, they manage to put constant high （79.11%） level, considering that the largest number of eggs per bird （171.19 vs. 164.54 and 160.11 in Arbor Acres and Ross 208, respectively）.

关键词： Arbor acres plus Cobb Avian 48 heavy broilers breeder lay intensity lay modeling Ross 208.

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Effect of Castration on Sensorial and Instrumental Characteristics of Longissimus Dorsi Muscle （LDM） of Brahman Cattle

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Journal of Life Sciences 2011年第6期5卷 460-465页

作者： Jose Angel Miguel jesus ciria Begona Asenjo David Colmenarez Hector Pargas College of Agricultural Engineers University of Valladolid Soria 42004 Spain University Centroccidental Lisandro Alvarado Barquisimeto 87220 Venezuela

This study aimed to investigate the effect of castration on the sensory and instrumental qualities of the longisssimus dorsi muscle of Brahman. Fifty animals （25 Brahman castrated and 25 uncastrated） were fed with forage and finished with forage and a commercial feed. The sensory analysis was performed by a seven-member sensory panel that had been trained. The panel evaluated the juiciness, myofibril tenderness, overall tenderness, connective tissue amount and flavor intensity of each sample according to an 8-point scale. The steaks that were to be used in the instrumental analysis were frozen, thawed, and cooked just like those used in the sensory analysis test. In order to assess shear force, the steaks were cooled 2 h at room temperature. Each strip was sheared once with a Warner-Bratzler ceil, and an average shear force value was calculated and recorded for each steak. Water retention capacity was measured as weight loss during cooking. Steaks used for shear force analysis were weighted before and after cooking. Significant differences were observed （P 〈 0.05） among sensory attributes, shear force, and cooking loss values in the beef of castrated and uncastrated. Both the panel and the consumers were able to detect differences in sensory characteristics between castrated and uncastrated, with the ratings favoring the castrated. The Warner-Bratzler device was also able to detect differences in tenderness between both groups, with steer beef having lower shear force and cooking loss values.

关键词： Castrated Brahman cattle cooking loss sensory attributes shear force.

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