Importancia del tipo de forraje y de la adición de concentrado en las dietas de ovejas sobre la producción de gas y metano

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Influencia del pastoreo de alfalfa o esparceta sobre los parámetros productivos y reproductivos de ovejas y corderos

Se utilizaron 42 ovejas y sus corderos machos, que permanecieron en pastoreo de alfalfa o esparceta durante la lactación. Tras el destete, los corderos fueron cebados con pienso y paja hasta que alcanzaron 22-24 kg peso vivo. Mientras, las ovejas permanecieron en las mismas parcelas hasta que finalizó el periodo de cubrición, y a continuación se reagruparon y se mantuvieron con un mismo manejo hasta el siguiente parto. Los corderos en pastoreo de alfalfa presentaron menor crecimiento diario que los de esparceta durante la lactación (269 vs. 302 g, P<0,05), pero similar en el cebo, siendo el peso al sacrificio similar. La fertilidad fue similar en ambos lotes (90,5 %). La descendencia de las ovejas de alfalfa presentó menor peso al nacimiento que las de esparceta (3,5 vs. 4,3 kg, P<0,05), debido quizá a la prolificidad registrada en el ensayo (1,9 vs. 1,5, NS). También se observó un desequilibrio en el ratio de hembras/machos, a favor de las hembras (57/43 y 72/28, para alfalfa y esparceta, NS). Estos resultados preliminares muestran una influencia positiva del pastoreo de esparceta sobre la ganancia media diaria de los corderos, que podría estar relacionada con la presencia de determinados compuestos secundarios en estos forrajesPublishe

Field pea can be included in fattening concentrate without deleterious effects on the digestibility and performance of lambs

The inclusion of different proportions of field pea (0%, 10%, 20% and 30%) for partially replacing soybean in the fattening concentrate of lambs was studied for its impact on apparent digestibility and performance during fattening. In the in vivo digestibility trial, 12 lambs (33 kg body weight) were placed in metabolic crates for two periods and received restricted amounts of concentrate and straw. The performance trial involved 54 lambs (13.4 kg body weight) that received concentrate plus straw ad libitum from weaning to slaughter. The intake of crude protein was higher in the 0% pea group than in the other groups (p < 0.05). The inclusion of field pea did not affect the digestibility, N retained or blood metabolites. In the performance trial, most traits were not affected, although a cubic effect of field pea inclusion on hot carcass weight and dressing percentage was observed (p < 0.05). The inclusion of field pea did not affect total protein, urea or ß-hydroxybutyrate concentrations but it affected creatinine and cholesterol concentrations (p < 0.05). In conclusion, field pea can constitute up to 30% of the fattening concentrate of lambs without deleterious effects on the digestibility and performance during fattening, and with minor effects on carcass characteristics

Sainfoin in the Dams’ Diet as a Source of Proanthocyanidins: Effect on the Growth, Carcass and Meat Quality of Their Suckling Lambs

Sainfoin (Onobrychis viciifolia) is a forage legume with a medium content of proanthocyani-dins (PAC), which may affect animal performance and product quality. The objective of the present study was to assess the effect of PAC from sainfoin fed to dams, using polyethylene glycol (PEG) as a blocking agent, on the performance and carcass and meat quality of their suckling male lambs. After lambing, twenty lactating dams were fed fresh sainfoin ad libitum plus 200 g per day of barley; ten were orally dosed with water (Sainfoin), and ten were dosed orally with a water dilution of 100 g PEG (Sainfoin + PEG). Their lambs (4.1 ± 0.64 kg at birth) suckled ad libitum until they reached the target slaughter weight of 10–12 kg. The presence of PAC in the dams’ diet did not affect the growth, blood metabolites and carcass weight and fatness of the suckling lambs but decreased the lightness of caudal fat (p < 0.05) and increased the weight of the digestive compartments (p < 0.05). Regarding the meat characteristics, PAC only decreased polyphenols content (p < 0.05). In conclusion, the presence of PAC in the dams’ diet had not significant effects on the performance and product quality of their suckling lambs. © 2022 by the authors. Licensee MDPI, Basel, Switzerland

Effect of the type of forage (Grazing vs. Hay) and the inclusion of condensed tannins in ewe's diet on milk quality and suckling lamb's growth: poster

Ewes are usually stalled around parturition and are fed hay plus concentrate during lactation while lambs are fed maternal milk. Grazing management could be a interesting alternative to stall-feeding. Moreover, the inclusion of tannins in the diet reduces methane emissions of the ewe and could improve their performanceResearch funded by Spanish Ministry of Economy and Competitiveness (INIA-RTA 2012-00080-00-00, RZP 2013-0001) and European Regional Development Fund. Student in receipt of a grant from Aragón GovernmentPublishe

Efecto del sistema de manejo y la adición de taninos condensados en ovejas en lactación sobre el cordero lechal

Publishedfinalista del Premio Jóvenes Investigadores de las XVI Jornadas AIDA 201

Nivel de proteína en piensos de cebo de corderos

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