We tested whether periconceptional nutrition with cladodes from the cactus, Opuntia ficus-indica, with or without protein-enrichment, improved the metabolomic profile and reproductive outcomes of adult female sheep. Sixty Rambouillet ewes of similar body weight were randomly allocated among three nutritional treatments that were fed during the breeding period (34 days): Control (Control; n = 20), Opuntia (Opuntia; n = 20) and protein-enriched Opuntia (E-Opuntia; n = 20). There were no effects of treatment on body weight but assessment of urine samples indicated that, for 76 metabolites, the Control and Opuntia groups differed completely (P < 0.05), whereas there was overlap between the Control and E-Opuntia groups. It appears that, in Opuntia-fed and Control-fed sheep, different functional groups are activated leading to changes in the metabolism of glucose, tyrosine, methane, and glycerolipids. Fertility and reproductive rate tended to be higher in the Opuntia (70% and 95%) and E-Opuntia (90% and 110%) groups than in the Control (55% and 65%), and an orthogonal contrast revealed the difference between Control and Opuntia to be significant for both reproductive variables (P < 0.05). We conclude that nutritional supplementation with Opuntia cladodes, with or without protein enrichment, increased fertility rate and reproductive rate of female sheep, without any accompanying increases in body weight. Our observations suggest that the reproductive responses to Opuntia do not simply reflect a response to good nutrition, but might be caused by specific metabolites/metabolomic pathways, perhaps by an activation of the metabolism of glucose, methane, tyrosine and glycerolipids. There are few reports relating these metabolomic compounds with the metabolism of the sheep, let alone with reproductive efficiency. The novelty of these discoveries suggests that we need further research into the mechanisms through which nutrition affects the reproductive system.
Se evaluó el comportamiento productivo de ovejas en pastoreo con y sin suplementación en épocas críticas y el comportamiento de los corderos en la Facultad de Agronomía y Veterinaria de la Universidad Autónoma de San Luis Potosí, a 22.23° LN y a 100.85° LO, a 1,835 m.s.n.m. en clima seco templado. Se utilizaron 24 hembras ovinas de la raza Rambouillet, con un peso promedio de 55 kg en praderas irrigadas de festuca alta (Festuca arundinaceae). Se utilizaron tres tratamientos, 1) solo pastoreo, 2) 300 gr/día de suplemento (rastrojo + pollinaza 10% + zeolita 5%) por oveja. y 3) 400 gr/día de suplemento (rastrojo + pollinaza 20% + zeolita 5%) por oveja. A las ovejas se les midió el Peso al empadre (PE), al parto (PP) y al destete (PD), Condición corporal al empadre (CCE), parto (CCP) y destete (CCD); a los corderos se les midió Peso al nacimiento del cordero (PNC) y destete (PDC), además Ganancia de Peso de Hembras (GPH), y Ganancia diaria de peso de corderos (GDPC). Se utilizó un modelo estadístico completamente al azar. Peso, ganancia de peso y condición corporal de hembras se vio favorecida por la suplementación estratégica al suministrar mayores nutrientes en las etapas de empadre, último tercio de gestación y lactancia, lo que se reflejó en mayores pesos de los corderos al nacimiento y destete
El objetivo de este estudio fue evaluar el uso de harina de soya integral (HSI), grano de soya termoprocesado (GST) y pasta de soya (PS) sobre parámetros productivos, balance de nitrógeno, y digestibilidad en borregas en crecimiento. Se utilizaron 27 corderas, con peso inicial de 30.4 ± 0.63 kg, asignadas aleatoriamente en tres grupos (HSI, GST y PS) con nueve animales cada uno. Los datos se analizaron con un diseño completam
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