Abstract

GOMEZ CUELLO, Jorge E et al. Use of Non-Linear Models for Growth, Development, and Posture of L-33 White Leghorn Hens, in Relation to Economic Indicators. Rev. prod. anim. [online]. 2018, vol.30, n.1, pp. 30-38. ISSN 2224-7920.

The Zootechnical Factors established by the main bioeconomic behavior indicators were determined for the productive-commercial cycle of L-33 White Leghorn hens in the province of Ciego de Avila, Cuba. A number of 55 cycles were analyzed for validation of mathematical models between 2002 and 2014; along with other 18 cycles, between 2014 and 2016. Descriptive statistics, generalized mixed models (GLIMMIX), and modeling with five functions were used, along with SAS 9.3. The productive cycles were similar to the standard set up for the Cuban breed and line. Laying accounted for 293 eggs/poultry, with a conversion of 1.40 feed kg/10 eggs, and a cost of $ 0.36 CUP an egg. The starting houses and the year had effects on live weight, tarsus length, uniformity, and daily weight gain up to 175 days. Sexual maturity, conversion, egg production, egg cost, and net income were influenced by the farm, whereas each farm´s starting house and the years, had negative effects on most biological indicators. Low, but significant effects of combined action of climate variables were observed in the bioeconomic indicators. The Gompertz models for growth, and MacNally for laying, were the best predicting tools for production. Along with GLIMMIX, they will contribute with suitable criteria for better decision making to increase egg production.

Keywords : mixed models; hens; farms; live weight; laying.

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