Harinas de raíz y follaje de yuca en raciones para ponedoras

La incorporación de raíz de yuca en raciones para ponedoras es ya práctica común en muchos países. Se conoce poca información sobre uso del follaje y especialmente combinado con raíz. Se realizaron dos experimentos. En el primero se estudiaron dos fuentes energéticas: maíz y harina de raíz de yuca secada mecánicamente a temperatura superior a 100 grados C (HRYT), combinados con cinco niveles de harina de follaje de yuca (HFY): 0 por ciento, 5 por ciento, 10 por ciento, 15 por ciento y 20 por ciento (factorial 2 x 5); se utilizaron aves Leghorn, asignándose a cada tratamiento cuatro grupos de 12 en cría y recría y 10 en postura. En el experimento II, se estudiaron tres fuentes energéticas: maíz, HXYT y harina de raíz de yuca secada al sol (HEYS), combinadas con tres niveles de HFY: 0 por ciento, 10 por ciento y 20 por ciento; utilizándose aves Sex link negras y el mismo número de grupos por tratamiento, con 15 aves por grupo en cría y recría y 12 en postura. Las aves se alojaron en jaulas metálicas individuales y se llevó control diario del consumo y producción de huevos. Los resultados indican: a) con HEYT y con HRYS se lograron pesos corporales satisfactorios al 50 por ciento de postura aunque inferiores al compararlos con maíz; b) las raciones a base de HRYT afectaron adversamente la producción de huevos; c) una ligera disminución de postura observada con HRYS, pudo deberse a deterioro en calidad de la yuca por largo período de secado; d) con la HFY la postura fue normal hasta 20 por ciento, combinada con maíz y hasta solo 10 por ciento con HRYS; e) se observa fuerte interacción raíz x follaje, afectando adversamente el comportamiento productivo, al incrementar el nivel de follaje, lo cual pudiera deberse a aumento en concentración de HCN

The incorporation of cassava root meal in laying hen diets is a common practice in several countries. Little information is known regarding the use of cassava foliage meal, specially combined with cassava root meal. Two experiments were carried out to study the effect of different combinations of cassava root and foliage meal. In the first one, two energetic sources were studied: corn meal and cassava root meal dried mechanically at 120 degrees C (CRMT), combined with 5 levels of cassava foliage meal (CFM): 0 percent, 5 percent, 10 percent, 15 percent and 20 percent (factorial 2 x 5). Leghorn birds were utilized, with 4 groups of 10 each during the laying period. In Experiment II, three energetic sources were studied: corn, CRMT and cassava root meal sundried, (CRMS) combined with 3 levels of CFM: 0 percent, 10 percent and 20 percent; commercial type red Sex Link birds were utilized, with 4 groups treatment and 15 birds/ group during brooding and growing and 12 during laying. The birds were located in cages and daily record of feed consumption and egg production were kept. The results indicate: a) with CRMS and with CRMT satisfactory body weight were obtain at 50 percent laying although these were lower when compared with the results obtained on a basis of corn based feeds; b) the feeds based on CRMT adversely affected egg production; c) a slight reduction in laying observed with CRMS could have been due to a deterioration in the quality of the cassava for the large period of drying; d) with cassava foliage meal the laying was normal up to 20 percent combined with corn and up to 10 percent with cassava root meal sun-dried; e) a strong root x foliage interaction is observed, adversely affecting the productive behavior, on increasing the foliage level, which could he due to the increase in the concentration of HCN in the feeds