Resumen

TEPOX PEREZ, María de los Ángeles; FUENTE MARTINEZ, Benjamín; JINEZ MENDEZ, Tomás  y  AVILA GONZALEZ, Ernesto. Different levels of metabolizable energy and sulfur amino acids in diets for white Bovans hens. Rev. mex. de cienc. pecuarias [online]. 2012, vol.3, n.4, pp.439-448. ISSN 2448-6698.

In order to evaluate the performance early egg production in the white Bovans hen fed diets with different levels of metabolizable energy (ME) and digestible methionine + cystine (AAD), to reduce the percentage of small eggs (<42 g ), three hundred and eighty four (384) hens 19-wk of age were used in a completely randomized design in a factorial arrangement of 4 X 2 where the first factor were the levels of ME (2700, 2800, 2900, 3000 Kcal/kg) and the second factor was the inclusion of two levels of ADD (0.45,0.61). Each treatment had four replications of 12 hens each. Egg production, egg weight, feed intake, egg mass and feed conversión were weekly measured for 8 wk, moreover, were classified according to egg weight. The results showed no effect for main factors and level of interaction between ME and the AAD for productive traits; an effect was found for feed intake and energy levels of sulfur amino acid levels (P<0.05). Higher levels of 2900 and 3000 ME kcal/kg (29.6 and 30.4 % respectively) reduced the percentage of small eggs. Percentage of large eggs was increased in 3 % by using diets with 0.61 % AAD level (P<0.05).

Palabras llave : Weight egg; Metabolizable energy; Sulfur amino acids.