Effect of age and body weight of Greater Rhea (Rhea americana) females on egg number, size and composition

CARLA LÁBAQUE; MÓNICA MARTELLA; MAESTRI, DAMIÁN; HOYOS, LAURA; JOAQUÍN NAVARRO

BRITISH POULTRY SCIENCE

TAYLOR & FRANCIS LTD

Año: 2010 vol. 51 p. 838 - 846

0007-1668

A study was conducted to evaluate how body weight and age of each female are related to the number and physical and chemical characteristics of the eggs produced throughout a breeding season in a captive-bred population of Greater Rheas (Rhea Americana) Reproductive performance of 15 females of three age classes (5 individuals per class) was monitored; female body weight was recorded before laying-onset. Al the eggs laid were collected and identified, and different morphometric variables, percentages of components and fatty acid composition were determined. The earlier the female started egg-laying, the longer the layer period and the greater the overall number of eggs produced. The onset of egg-laying in turn seemed to be related to the attainment of a high body weight. Except for length, the values for the morphometric variables of the eggs and unsaturated fatty acids (palmitoleic, oleic and linoleic) increased with female age. High body weight was associated with low palmitic and palmitoleic fatty acids and high linoleic, linolenic and total unsaturated fatty acids. Live weight and age of females can determined several physical and chemical characteristics of eggs.