Food restriction in sheep: Endocrine-metabolic response according to the level of body reserves [Restricción alimenticia en ovinos: Respuesta endocrino-metabólica dependiente de las reservas corporales]
Fernandez-Foren A.,Laboratorio Of Tecnicas Nucleares |
Abecia J.,University of Zaragoza |
Vazquez M.,University of Zaragoza |
Forcada F.,University of Zaragoza |
And 4 more authors.
ITEA Informacion Tecnica Economica Agraria | Year: 2011
The metabolic responses to changes in metabolic status could depend on recent (feeding level) or more ancient (body reserves) metabolic history, a concept termed "metabolic memory". The aim of this work was to study the metabolic response to food restriction in ewes with different body condition score at the beginning of the experiment (CCi). During the breeding season, 36 Rasa Aragonesa ewes were divided into 2 groups with different BCS: BCS > 2.75 (fat ewes, A, mean ± standard error: 2.9 ± 0.04) and BCS < 2.25 (lean ewes, B, 2.1 ± 0.04). During 20 days, both groups received a diet to supply energy and protein maintain requirements, each group was divided into 2 groups and were fed to provide either 1.5 or 0.5 times the daily maintenance requirements; therefore, the 4 groups were: fat control (AC, n = 9), fat undernourished (AS, n = 10), lean control (BC, n = 9) and lean undernourished (BS, n = 8) ewes. Body weight (BW), glucose, non-esterified fatty acids (NEFA), ß-hydroxybutyrate (BHB), insulin, leptin, and insulin-like growth factor (IGF-I) were determined. BS and AS groups lost weight, BC group gained weight, and ACewes maintained their BW. Plasma glucose concentration and insulin were higher and NEFA was lower in control ewes. Ewes with high BCS had higher concentrations of insulin and IGF-I, and leptin tended to be higher in these animals. Insulin concentrations were higher in control ewes, while other hormones remained unchanged. Glucose, BHB, insulin and IGF-I profiles were affected by initial BCS and nutritional treatment, as is demonstrated by the significant interaction between these factors and days. Metabolites (glucose and BHB) and metabolic hormones (insulin and IGF-I) concentrations showed a peak at estrus time. In conclusion, it was found that glucose, BHB, insulin and IGF-I profiles respond to undernutrition according to the level of body reserves of the animals at the onset of the nutritional restriction.
Munoz G.,INIA |
Alcazar E.,SAT Vallehermoso |
Fernandez A.,INIA |
Barragan C.,INIA |
And 5 more authors.
Meat Science | Year: 2011
Polymorphisms MC4R c.1426A>G (p.Asp298Asn) and LEPR c.2002C>T (p.Leu663Phe) have been associated in pigs with feed intake, growth and fatness. Our aims were to analyze how these polymorphisms influence production and quality traits in Duroc × Iberian crossbred pigs, and moreover evaluate how the effects of gender and Duroc line were affecting these traits. Significant effects of gender, Duroc sire line and LEPR c.2002C>T mutation, were detected on the main traits. LEPR c.2002T allele increased body weight (2.5 ± 0.7. kg), backfat thickness (1.5 ± 0.4. mm), loin intramuscular fat (0.7 ± 0.2 %), and lightness (1.0 ± 0.3); however it was decreasing premium cuts yield (-0.9 ± 0.2%). Allele c.2002T increased SFA (0.60 ± 0.12 %), and decreased MUFA (-0.35 ± 0.12%) and PUFA (-0.25 ± 0.06%). No significant effects of MC4R c.1426A>G SNP were identified. A genetic test based on the LEPR c.2002C>T SNP may be useful to select Duroc sires to reduce undesirable heterogeneity of carcasses and premium cuts of crossbred animals. © 2010 The American Meat Science Association.
Hernandez J.E.,Produccion Animal |
Franco F.J.,Produccion Animal |
Villarreal O.A.,Produccion Animal |
Camacho J.C.,Produccion Animal |
Pedraza Y.R.M.,University of Camaguey
Archivos de Zootecnia | Year: 2011
The purpose of this work is the socioeconomic and productive characterization of 15 family goat farms in Piaxtla municipality of Puebla. Farms were studied by means of surveys, including social, economic and animal husbandry aspects. From sixteen variables used the principal component analysis selected nine. The indices of quality of life in employment, education, health, housing, balanced diet, salary, sports and culture are weak, this has caused a strong current of migration of young people in these communities to United States.