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Nieto R.,Colegio de Mexico | Nieto R.,Polytechnic University of Francisco I. timber | Sanchez-Torres M.T.,Colegio de Mexico | Figueroa J.L.,Colegio de Mexico | And 5 more authors.
Livestock Science | Year: 2015

The addition of n-3 polyunsaturated fatty acids (PUFA) to the diet of ruminants can benefit the reproductive process in the female. The current study was conducted to assess the effect of a short period of feeding a diet that included fish meal and oil on the progesterone (P4) and insulin (INS) profile, and on reproductive variables including estrous onset, pregnancy and prolificacy in virgin ewes artificially inseminated by laparoscopy (AIL). Forty-two Dorset ewes were assigned into two experimental groups: These groups were no supplementation (CON; n=21) and a group supplemented with fish meal and oil (4 and 0.8%; FMO; n=21). Ewes were fed the experimental diets for 15 days, beginning four days before inserting sponges for estrus synchronization and ending the day the vaginal sponges were removed. Each ewe received 0.8kg d-1 feed in individual pens. Ewes were pre-synchronized with prostaglandin F and later synchronized with chronolone sponges for 11 days. When sponges were removed, the ewes received 200 IU of eCG. The AIL began 48h after sponge removal and estrus detection. The time of estrus onset was different among groups (P<0.05; CON: 35.1±2.1; FMO: 41.0±1.8h). No differences were found in P4 (FMO: 3.8±1.2; CON: 3.5±1.4ngmL-1) or INS concentrations in serum (FMO: 0.12±0.02; CON: 0.13±0.03ngmL-1). Adding fish meal and oil to the diet did not affect pregnancy percentage (FMO: 52%; CON: 55%), but it did affect the prolificacy index (FMO: 1.63; CON: 1.25) (P<0.05). It was concluded that the addition of fish meal and oil to the diet of virgin ewes over a short period time delayed onset of estrus and enhanced prolificacy. © 2015 Elsevier B.V..


Barreto-Hauzeur E.,Asesor Independiente | Saenz-Lozada M.L.,National University of Colombia | Velandia-Sepulveda F.,Instituto Colombiano Of Bienestar Familiar | Gomez-Gonzalez J.,Fundaterapia
Revista de salud pública (Bogotá, Colombia) | Year: 2013

OBJECTIVES: Ascertaining the meaning of teenage pregnancy for teenagers and their immediate families.METHODOLOGY: This was an analytical, cross-sectional, exploratory, qualitative study. Data was obtained through in-depth interviews with 10 pregnant teenagers and their immediate families, plus a focus group involving another 12 pregnant teenagers.RESULTS: Analysis by category revealed a tenuous limit between adolescents' narrative identity and a lack of such identity and identity based on the concept of family. Pregnancy provokes a series of responses within families, including fear in a pregnant adolescent and her partner, disappointment on the part of the parents, social isolation and eventual acceptance and redefinition of such pregnancy.CONCLUSIONS: Pregnancy can provide the means for an adolescent to redress a deficit in her emotional needs, such condition keeping the family together at the expense of a teenager's emancipation and may represent an intergenerational legacy.


PubMed | National University of Colombia, Asesor Independiente, Instituto Colombiano Of Bienestar Familiar and Fundaterapia
Type: Journal Article | Journal: Revista de salud publica (Bogota, Colombia) | Year: 2014

Ascertaining the meaning of teenage pregnancy for teenagers and their immediate families.This was an analytical, cross-sectional, exploratory, qualitative study. Data was obtained through in-depth interviews with 10 pregnant teenagers and their immediate families, plus a focus group involving another 12 pregnant teenagers.Analysis by category revealed a tenuous limit between adolescents narrative identity and a lack of such identity and identity based on the concept of family. Pregnancy provokes a series of responses within families, including fear in a pregnant adolescent and her partner, disappointment on the part of the parents, social isolation and eventual acceptance and redefinition of such pregnancy.Pregnancy can provide the means for an adolescent to redress a deficit in her emotional needs, such condition keeping the family together at the expense of a teenagers emancipation and may represent an intergenerational legacy.


Turriza-Chan J.L.,Campeche Institute of Technology | Castellanos-Ruelas A.F.,Autonomous University of Yucatán | Rosado-Rubio J.G.,Autonomous University of Yucatán | Heredia M.,Asesor Independiente | And 2 more authors.
Agrociencia | Year: 2010

Studies on the mineral profile of fodder consumed by grazing ruminants must be completed with information on its effect on the tissues since deficiencies and mineral imbalances are reflected in the body composition and consequently in the productivity of animals. The aim of this study was to quantify four minerals on the twelfth rib of hair sheep grazing in the state of Yucatán during the rainy season (June-October). Fifty farms of sheep breeders were sampled in 47 municipalities and 139 rib samples were collected through biopsies. The contents of Ca, K, Cu and Fe were determined by using atomic absorption spectrophotometry. Results were statistically analyzed using a completely randomized experimental design with a trifactorial arrangement, including the effect of the geographical area (Centre, East, West and South), the physiological status of sheep (Weaning, Yearling and Adult), soil type (Luvisol, Vertisol, Cambisol, Rendzina, Litosol), double and triple interactions. The geographical location showed no effect (p>0.05) on the Ca content; the average was 42.7 %, above 36 % (considered normal). In the eastern and central zones, 33 % and 27 % of the samples recorded a Ca content below normal. In addition, the average concentrations of K (0.017 %), Cu (0.68 ppm) and Fe (4.6 ppm) were lower than normal levels. Weaning showed the lowest Ca content (p≤0.05) and the highest of K (p≤0.05) on the rib. There was no effect (p>0.05) of the soil type on the content of Ca, K, Cu and Fe. It was concluded that there are Ca deficiencies in the central zone which affect the lambs mostly at weaning. Deficiencies of K, Cu and Fe were also detected in bone.


May E.F.V.,Autonomous University of Yucatán | Rubio J.G.R.,Asesor Independiente | Ruelas A.F.C.,Asesor Independiente | Aguilar M.H.Y.,INIFAP SAGARPA. Chetumal | Cabrera-Torres E.J.,INIFAP SAGARPA. Chetumal
Revista Mexicana De Ciencias Pecuarias | Year: 2011

The purpose of the present study was to diagnose contents of five minerals in forages that grow in sheep farms during the rainy season in the State of Yucatán, Mexico. A total of 50 farms in 47 municipalities were sampled and 88 forage samples were gathered. Ca, K, Fe, Cu and Zn contents were determined through atomic absorption spectrophotometry and average content and dispersion parameters were estimated. Results were analyzed using a General Linear Model to detect effects of sampling area (Center, East, South, West), soil type (Rendzina, Litosol, Luvisol, Vertisol, Cambisol), forage type, interactions and experimental error. Average results obtained were 0.53±0.41 % Ca, 0.51±0.24 % K, 12.8±10.1 % Cu, 251±149 ppm Fe and 27.6±12.6 ppm Zn. Nutrient content adequacy for 40 kg single lamb lactating ewes was 34, 48, 27.8 and 57.7 % for Ca, K, Cu and Zn, respectively. Practically no deficiencies were found for Fe. Both Ca and Zn content was greater (P<0.05) in East and West areas. Soil type effect was only found in Cambisols, which showed a greater Cu content (P<0.05). Rangeland forage showed the higher Ca, K, Cu and Zn content (P<0.05). It can be concluded that nutrient inadequacies were found for Ca, K, Cu and Zn, while Fe showed high levels. Formulation and manufacture of mineral supplements meant for sheep in Yucatan should include these minerals and be Fe free.


May E.F.V.,Autonomous University of Yucatán | Rubio J.G.R.,Autonomous University of Yucatán | Ruelas A.F.C.,Asesor independiente | Aguilar M.H.Y.,Asesor independiente | Cabrera-Torres E.J.,INIFAP SAGARPA
Tecnica Pecuaria en Mexico | Year: 2011

The purpose of the present study was to diagnose contents of five minerals in forages that grow in sheep farms during the rainy season in the State of Yucatán, Mexico. A total of 50 farms in 47 municipalities were sampled and 88 forage samples were gathered. Ca, K, Fe, Cu and Zn contents were determined through atomic absorption spectrophotometry and average content and dispersion parameters were estimated. Results were analyzed using a General Linear Model to detect effects of sampling area (Center, East, South, West), soil type (Rendzina, Litosol, Luvisol, Vertisol, Cambisol), forage type, interactions and experimental error. Average results obtained were 0.53±0.41% Ca, 0.51±0.24% K, 12.8±10.1% Cu, 251±149 ppm Fe and 27.6±12.6 ppm Zn. Nutrient content adequacy for 40 kg single lamb lactating ewes was 34, 48, 27.8 and 57.7% for Ca, K, Cu and Zn, respectively. Practically no deficiencies were found for Fe. Both Ca and Zn content was greater (P<0.05) in East and West areas. Soil type effect was only found in Cambisols, which showed a greater Cu content (P<0.05). Rangeland forage showed the higher Ca, K, Cu and Zn content (P<0.05). It can be concluded that nutrient inadequacies were found for Ca, K, Cu and Zn, while Fe showed high levels. Formulation and manufacture of mineral supplements meant for sheep in Yucatan should include these minerals and be Fe free.

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