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handle: 10261/269332
[FR] La dispersión y estacionalidad de los recursos forrajeros del área mediterránea, hace aconsejable una disponibilidad múltiple para poder completar ciclos de gestación y lactancia en ganado ovino. Estos recursos incluyen las rastrojeras de cereal y el prado artificial reservado de otoño. La fecha media de paridera fué a comienzos de Noviembre. Durante el período de gestación, las ovejas de raza Manchega seleccionaron una dieta de superior calidad a la del recurso ofrecido (las muestras de fístula esofágica presentaron 63.3% de materia seca digestible (MSD) y 12.8% de proteína bruta (PB). Sin embargo, los bajos niveles de materia seca (MS) ingerida (1100 g MS oveja−1 d−1) aconsejaron un cierto nivel de suplementación al final de la gestación. En el prado reservado, el nivel de ingestión fué superior (1740 g DM oveja d−1)), al igual que la calidad de la dieta ingerida (78.3% MSD y 20.0% PB). Cuando las ovejas se suplementaron con menos de 0.5 kg de concentrado d−1 en el período de lactancia, el efecto principal fué un descenso del peso vivo. El efecto de la suplementación fué escaso sobre el peso vivo de los corderos (201 g d−1 de media) o la producción de leche (694 cc d−1 de media).
[EN] Sparsity and seasonality of most Mediterranean grazing land resources requires diversification in order to complete full cycles of pregnancy and lactation, including grazing winter cereal stubbles and stockpiled sown pastures. Early November was the mean lambing date. Over the gestation period the ewes selected a much better quality diet than the resources offered (oesophageal fistula samples had 63.3% digestible dry matter (DDM) and 12.8% crude protein (CP). Nevertheless, low values of dry matter (DM) intake (1100 g DM per ewe per day) made it advisable to add supplement late in pregnancy. Higher levels of DM intake (1740 g DM per ewe per day) with a better quality diet (78.3% DDM and 20.0% CP) were obtained on the stockpiled pastures. Lactating ewes reacted to no more than 0.5 kg concentrate per ewe per day mainly by decreasing liveweight loss. Little differences were found from the effects of ewes' supplementation on lambs' liveweight gain (average 201 g d−1) or ewes' milk yields (average 694 ml d−1).
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