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Vieira C.,Leon Institute of Technology | Fernandez-Diez A.,University of Leon | Mateo J.,University of Leon | Bodas R.,Institute Ganaderia Of Montana Csic Ule | And 2 more authors.
Meat Science | Year: 2012

The effect of different vegetable oils used in the diet of lactating ewes on the meat quality of their suckling lambs has been evaluated. Lambs (males and females) were slaughtered at 11. kg. Fortyeight lactating Churra ewes (prolificacy 1.5) and their suckling lambs were assigned to four treatments according to the oil added (3% on weight basis) to the ewes' daily ration: palm oil as control (CON); olive oil (OLI); soybean oil (SOY); and linseed oil (LIN). Analyses of pH, colour, thiobarbituric acid reactive substances (TBARS), tocopherol levels, volatile compounds and a sensory evaluation were carried out on suckling lambs' meat. Results showed no substantial effect on pH, colour, TBARS and tocopherol levels. Volatiles typically derived from lipid oxidation were higher in SOY group. However, panellists were only able to correctly identify samples from LIN group. Furthermore, the meat from LIN group showed lower scores towards odour and flavour quality and overall liking than that from the rest of treatments. © 2012 Elsevier Ltd. Source

Gomez-Cortes P.,Institute Investigacion En Ciencias Of La Alimentacion Csic Uam | Gallardo B.,University of Valladolid | Mantecon A.R.,Institute Ganaderia Of Montana Csic Ule | Juarez M.,Institute Investigacion En Ciencias Of La Alimentacion Csic Uam | And 2 more authors.
Meat Science | Year: 2014

The main objective of this study was to evaluate the effects of supplementing lactating ewe diets with extruded linseed on the fatty acid (FA) composition of intramuscular and subcutaneous fat depots of suckling lambs. Twenty-four pregnant Churra ewes were divided into two groups based on the milk production, age, body weight and parity, and assigned to one of two treatments. Each ewe of the Control treatment was supplemented with 70. g/day of FAs from a calcium soap of palm oil, while the other treatment group (Lin) was supplemented with 128. g/day of extruded linseed. All lambs were reared exclusively on milk and were slaughtered when they reached 11. kg live weight. FA profiles of ewe milk, lamb meat and subcutaneous adipose tissue were determined by GC. Lamb performance was not affected by the treatments. Muscle fat and adipose tissue from the Lin treatment showed higher proportions of polyunsaturated fatty acids (PUFA). The percentages of α-linolenic (C18:3 n.3), docosahexaenoic (C22:6 n. 3), vaccenic (trans-11 C18:1) and rumenic (cis-9, trans-11 C18:2) acids in both fat depots were higher in Lin than in Control suckling lambs. Furthermore, meat fat from Lin carcasses displayed a lower n. 6/n. 3 ratio than Control samples. Intramuscular depots clearly showed a greater content of PUFA, including cis-9, trans-11 C18:2, and a lower n. 6/n. 3 ratio than subcutaneous fat. The results from this study demonstrate that dietary extruded linseed supplementation of lactating ewes enhances the nutritional quality of suckling lamb fat depots such as intramuscular and subcutaneous fats. © 2013 Elsevier Ltd. Source

Regidor-Cerrillo J.,Complutense University of Madrid | Benavides J.,Institute Ganaderia Of Montana Csic Ule | Alvarez-Garcia G.,Complutense University of Madrid | Fuertes M.,Institute Ganaderia Of Montana Csic Ule | Ortega-Mora L.M.,Complutense University of Madrid
Veterinary Research | Year: 2014

Neospora caninum has been detected only sporadically in cases of ovine abortion, and it has therefore traditionally been considered as an unimportant parasite in small ruminants. This study was carried out with the aim of identifying the pathogen causing serious reproductive problems on a commercial sheep farm. Sera from all rams and ewes tested negative for antibodies against Border disease virus, Schmallenberg virus and Coxiella burnetii, and infections by these agents were therefore ruled out. Nevertheless, seropositivity to N. caninum and/or Toxoplasma gondii was detected, although the seroprevalence was higher in the case of N. caninum. The percentage of lambings and the number of lambs per dam were significantly lower in ewes that were seropositive to N. caninum while no effect on these parameters was detected in ewes that were seropositive to T. gondii. There was also no evidence of infection by T. gondii in the foetal/lamb tissues analyzed by PCR and/or immunohistopathological techniques. On the contrary, the DNA of N. caninum was detected in 13 out of 14 foetuses/lambs descendant from dams seropositive to this parasite. Characteristic lesions caused by N. caninum and/or its antigen were also detected. Genotyping of the N. caninum DNA revealed only two closely related microsatellite multilocus genotypes. The results clearly demonstrate that infection by N. caninum was the cause of the low reproductive performance of this sheep flock. © 2014 González-Warleta et al.; licensee BioMed Central Ltd. Source

Bodas R.,Institute Ganaderia Of Montana Csic Ule | Manso T.,University of Valladolid | Mantecon A.R.,Institute Ganaderia Of Montana Csic Ule | Juarez M.,CSIC - Institute of Refrigeration | And 2 more authors.
Journal of Agricultural and Food Chemistry | Year: 2010

The purpose of this work was to obtain a cheese from ewes milk with a healthier fatty acid (FA) profile. To achieve our aim, 48 ewes (12 per treatment) were fed diets supplemented with 3% of plant oils: palm (used as control), olive (OO), soybean (SO), and linseed (LO). Milk samples from each treatment were collected to manufacture cheeses. The cheesemaking process did not modify the dairy fat FA profile, but OO, SO, and LO did reduce the C12:0 + C14:0 + C16:0 content in dairy fat, thus decreasing the atherogenic index value in the cheeses. Percentages of cis-9 trans-11 C18:2 in cheeses ranged from the 0.43 control value to 0.92, 1.64, and 2.71 with OO, LO, and SO respectively, following the same pattern as trans-11 C18:1. In contrast, trans-10 C18:1 levels were always below 1%. The lowest n-6/n-3 ratio obtained with LO (1.43) suggests that such lipid supplementation would be the most effective nutritional strategy for improving cheese FA profiles. © 2010 American Chemical Society. Source

Bichi E.,Institute Ganaderia Of Montana Csic Ule | Bichi E.,French National Institute for Agricultural Research | Toral P.G.,Institute Ganaderia Of Montana Csic Ule | Hervas G.,Institute Ganaderia Of Montana Csic Ule | And 5 more authors.
Journal of Dairy Science | Year: 2012

This study was conducted in lactating ewes to examine the involvement of {increment} 9-desaturase in mammary lipogenesis, especially in the endogenous synthesis of cis-9, trans-11 18:2 and cis-9 18:1, because no information on this matter was available for dairy sheep. With this aim, 6 Assaf ewes were monitored in a 15-d experiment, which included a 5-d pretreatment period, a 5-d treatment period, and a 5-d posttreatment period. During the treatment period, ewes received 0.5g/d of sterculic acid (a cyclopropene fatty acid that inhibits {increment} 9-desaturase), delivered intravenously in 4 equal doses at 6-h intervals. Animals were fed pasture to supply mainly α-linolenic acid and minimize the amount of milk cis-9, trans-11 18:2 of ruminal origin. Sterculic acid administration was calculated to inhibit {increment} 9-desaturase by 70% based on the milk content of cis-9 14:1. This inhibition resulted in decreases in the milk content of the enzyme products (e.g., cis-9 10:1, cis-9 14:1, cis-9 16:1, cis-9 18:1, and cis-9, trans-11 18:2) and increases in its substrates (e.g., 14:0, 18:0, and trans-11 18:1), as well as in reductions in the desaturase indexes. Some other milk fatty acids, further to previously reported products or substrates of {increment} 9-desaturase (e.g., cis-15 18:1 and cis-9, cis-15 18:2, or trans-11, trans-15 18:2, and cis-9, trans-11, trans-15 18:3), were also affected by sterculic acid administration. Endogenous synthesis was the major source of cis-9 18:1 and cis-9, trans-11 18:2, accounting for 63 and 74% of its content in milk fat, respectively. To our knowledge, the present study provides the first estimates of endogenous synthesis of these 2 bioactive fatty acids in ovine milk fat. © 2012 American Dairy Science Association. Source

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