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|Título :||ENERGY REQUIREMENTS FOR MAINTENANCE AND EGG PRODUCTION FOR BROILER BREEDER HENS (REQUERIMIENTO DE ENERGIA METABOLIZABLE PARA MANTENIMIENTO, PRODUCCION DE HUEVOS, EN REPRODUCTORAS PESADAS|
|Autor :||REYES CORONEL, MARTHA ESTHER|
COON, C. N.
|Palabras clave :||Metabolizable energy|
|Fecha de publicación :||2012|
|Editorial :||REVISTA DE MEDICINA VETERINARIA Y ZOOTECNIA, VOL. 1|
|Resumen :||Mathematical modeling is an accounting tool that can be used for predicting the nutritional requirements for poultry with different genetic strains, environments and stages of meat gain or egg production. Models are also useful for describing or predicting the animal’s production process. Modeling the daily ME requirement of broiler breeder hens requires partitioning Metabolizable Energy (ME) requirements into maintenance, egg mass and body weight gain. Determining the daily energy requirement for maintenance and egg production in breeders requires separating the daily energy needs for egg production from energy needs of maintenance. The objective of the research reported herein was: 1.) to obtain information about body tissue changes and egg composition for breeders being fed specific intakes of ME in a set environment and 2.) to evaluate a technique for partitioning the Metabolizable Energy (ME) requirement into maintenance and production for each individual breeder. An estrogen antagonist, TAMOXIFEN ([Z]-1-1[p-Dimethylaminoethoxyphenyl]-1,2-diphenyhl-1butene) (TAM), was used to separate the ME needs into two periods: laying and non-laying. Broiler breeder hens were provided TAM to stop egg production and their individual ME requirement for maintenance determined. Each broiler breeder resumed egg production when TAM was withdrawn and the ME requirement for egg production and BW gain determined. The estimated ME required for maintenance for breeders (MEm) housed in a constant 21C was 98.3 kcal/kgBW0.75, MEg for gain was 5.6 kcal/g and MEe for egg mass was 2.4 kcal/g. The energy efficiencies for protein gain (kp), fat gain (kf) and egg calories (ke) were 34%, 79% and 65.7%, respectively. The use of TAM provided an opportunity to estimate breeder maintenance requirements and reduce the interdependence in estimating factorial coefficients while partitioning production energy needs.|
|Descripción :||Feed costs represent around 70% of the poultry production costs. Nutritional requirements for any nutrient needs to be fully understood in order to know the potential risk in production when trying to reduce feed costs and develop appropriate margins of safety. Research in the area of the energy requirements has been focused on estimating the energy requirements for laying hens while for broiler breeder hens the information is slowly being developed. Metabolizable Energy (ME) requirements for broiler breeder hens are higher than for commercial layers primarily because of their larger body size. Nevertheless, in many cases the maintenance energy requirement of metabolizable energy (MEm) has been extrapolated from studies conducted mainly with Leghorn type hens (Leeson, 2003).|
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