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Metabolic Adaptations Due to the Inclusion of Pasture in the Diet of Dairy Cows Fed Total Mixed Ration during Early Lactation

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Open Journal of Animal Sciences 2017年第2期7卷 127-140页

作者： ana Laura Astessiano ana meikle Pablo Chilibroste Diego Antonio Mattiauda M. Fajardo Mariana Carriquiry Facultad de Agronomía Universidad de la República Montevideo Uruguay Facultad de Veterinaria Universidad de la República Montevideo Uruguay

The aim of this study was to evaluate the metabolic adaptations due to the inclusion of pasture in the diet of dairy cows fed on a total mixed ration (TMR) ad libitum during early lactation. Multiparous cows (n=18) were used in a randomized complete block design and were randomly assigned according to parity, BW and BCS to one of two feeding strategies from calving to 60 DIM: 1) cows fed TMR ad libitum (without access to pasture;100% TMR) and 2) cows fed on a mixed system with pasture grazing (6 h of access to paddock in one grazing session, 8:00 to 14:00 h) and supplemented with 50% of ad libitum TMR (Pasture Group, PG). At 61DIM, TMR fed cows were assigned without an adjustment period to a similar feeding and management routine than PG group (Post-TMR), while PG cows remained in their original routine throughout the experiment. Thus, at 61DIM and thereafter, both, PG and Post-TMR cows grazed a second-year pasture and were supplemented with 50% TMR (DM basis). Milk production was determined daily until 80 DIM, and cow BCS and BW were registered and blood samples and liver biopsies were obtained one week before and one week after dietary change (-1 to +1 wk;+55 and +69 DIM). Milk yield, BW and BCS did not differ between treatments but decreased or tended to decreased from -1 to +1 wk only in Post-TMR cows. Serum IGF-1 tended to increase in Post-TMR cows. Hepatic expression of IGFBP5 and IGFBP6 mRNA, were greater while IGF1 and IGFBP3 mRNA tended to be greater for Post-TMR than PG cows. Hepatic expression of IGF1, IGFBP5 and IGFBP6 mRNA increased from -1 to +1 wk only in Post-TMR cows. Expression of ACADVL and PDH1A mRNA had a 2-fold increase in both groups from wks -1 to +1. The results confirm that changes in feeding strategy without an adaptation period modified animal metabolism. The inclusion of grazing to cows that were fed TMR during early lactation, increased IGF-1 concentrations and modified hepatic expression of genes related with IGF system and fatty acid

关键词： Turnout to Pasture Hepatic Expression Dairy Cattle

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Hepatic Expression of Insulin-Like Growth Factor-1 inUnderfed Pregnant Ewes

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Journal of Agricultural Science and Technology(A) 2016年第5期6卷 355-362页

作者： Victoria de Brun ana meikle Alberto Casal Mariana Carriquiry Claudia Menezes Femando Forcada Cecilia Sosa Jose Alfonso Abecia Laboratory of Animal Endocrinology and Metabolism Veterinary Faculty University of La Repfiblica Lasplaces 1550Montevideo 11600 Uruguay Department of Animal Production and Grazing Agronomy Faculty University of La Republica Garzon 780 Montevideo 12900Uruguay Aragon Environmental Research Institute Department of Animal Production and Food Science University of Zaragoza MiguelServet 177 Zaragoza 50013 Spain

The liver is one of the most important visceral organs, which represents a large contribution to whole animal energyexpenditure and the major synthetic site of insulin-like growth factor-I （IGF-1） peptide. Decreased plane of nutrition acts byreducing the metabolic rate and mass of metabolic tissues, such as liver. Also, undernutrition results in the reduced circulating IGF-1concentrations, due to the uncoupled growth hormone-IGF （GH-IGF） axis. This study investigated whether a 22-day period ofundernutrition （half maintenance） could affect liver mass and IGF-1 protein and gene expression. Sixteen pregnant ewes fed all （n =9） or half （n = 7） of their maintenance energy requirements were slaughtered on day 7 of pregnancy （oestrus = day 0）. Body and livermass, IGF-1 plasmatic concentrations and liver IGF-1 mRNA and protein expression were determined. Liver mass and the proportionof liver mass to empty body weight were lower in underfed animals. While IGF-1 plasmatic concentrations were lower inundernourished ewes, no differences in liver mRNA expression were found. This is the first time that differences inimmunohistochemistry intensity and total content are reported in sheep. In summary, the decreased plasma IGF-I concentrationsinduced by undernutrition in ewes was not associated with its reduced hepatic mRNA or protein expression, but to a decrease in livermass.

关键词： Undemutrition, insulin-like growth factor-l, liver mass, sheep.

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