The objective of the study was to evaluate the effect of genotype, sex, twins and year of birth on the productive behavior of purebred hair lambs (Blackbelly, Katahdin and Pelibuey) and crosses (Blackbelly x Dorper-Pelibuey) in a production system with intensive grazing in the area of Güémez, Tamaulipas, Mexico. Data from 290 lambings from four lambing seasons were analyzed with a linear model. Birth weight was greater in Katahdin (3.75 kg) and in single lambing (3.74 kg) as compared to twin lambing, while the sex of the lamb did not show significant difference. The body weight gain at weaning was greater in the Blackbelly x Dorper-Pelibuey lambs (0.217 kg), as well as the weaning weight (16.65 kg).

El objetivo del estudio fue evaluar el efecto del genotipo, sexo, tipo de parto y año de nacimiento sobre el comportamiento productivo de corderos de razas de pelo (Blackbelly, Katahdin y Pelibuey) y cruces (Blackbelly x Dorper-Pelibuey) en un sistema de producción con pastoreo intensivo en la zona de Güémez, Tamaulipas, México. Se analizaron datos de 290 partos, obtenidos en cuatro épocas de parición y analizados con un modelo lineal. El peso al nacimiento fue mayor en Katahdin (3.75 kg) y en corderos de parto simple (3.74 kg), mientras que el sexo del cordero no produjo diferencia significativa. La ganancia de peso predestete fue mayor en los corderos Blackbelly x Dorper-Pelibuey (0.217 g), al igual que el peso al destete (16.65 kg).

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The study aimed to evaluate different levels of inclusion of Moringa oleifera L. forage in diets for growing lambs on the kinetics of ruminal fermentation and in vitro degradability. Five treatments were used, expressed in g kg-1 DM and consisted of control (IM0 = 0), low inclusion level (IM10 = 100), medium inclusion levels (IM20 = 200 and IM30 = 300) and high inclusion level (IM40 = 400). No effect of moringa inclusion levels was observed at 6, 12 and 24 h; however, at 48 h the IM40 inclusion level obtained the lowest value (116.0 ml g-1). In the accumulated gas production at 48 and 72 h, a linear pattern was observed, as the level of inclusion of M. oleifera in the diet increases, gas production decreases. Likewise, it was observed that the in vitro digestibility of dry matter was affected by the level of inclusion of M. oleifera, observing a decrease in degradability as the level of ...

The study aimed to evaluate different levels of inclusion of Moringa oleifera L. forage in diets for growing lambs on the kinetics of ruminal fermentation and in vitro degradability. Five treatments were used, expressed in g kg-1 DM and consisted of control (IM0 = 0), low inclusion level (IM10 = 100), medium inclusion levels (IM20 = 200 and IM30 = 300) and high inclusion level (IM40 = 400). No effect of moringa inclusion levels was observed at 6, 12 and 24 h; however, at 48 h the IM40 inclusion level obtained the lowest value (116.0 ml g-1). In the accumulated gas production at 48 and 72 h, a linear pattern was observed, as the level of inclusion of M. oleifera in the diet increases, gas production decreases. Likewise, it was observed that the in vitro digestibility of dry matter was affected by the level of inclusion of M. oleifera, observing a decrease in degradability as the level of ...