The Changes of Circulating Feed-intake Regulator of Japanese Black Steer during the Fattening Period
|
Accession number;05A1044278
|
| Title;The Changes of Circulating Feed-intake Regulator of Japanese Black Steer during the Fattening Period |
| Author;
KIDO KYOKO
(NARO, National Inst. Livestock and Grassland Sci., JPN)
HAYASHI MASAYUKI
(NARO, National Inst. Livestock and Grassland Sci., JPN)
HODATE KYOKO
(NARO, National Inst. Livestock and Grassland Sci., JPN)
|
Journal Title;Shokuniku ni kansuru Josei Kenkyu Chosa Seika Hokokusho
|
Journal Code:X0296A
|
ISSN:
|
|
VOL.23;NO.;PAGE.138-142(2005)
|
| Figure&Table&Reference;FIG.2, TBL.1, REF.8 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The imported beef that occupied 1/3 of the domestic consumption was halted by the frequent occurrence of domestic animal diseases in recent years. Corresponding to the decreased imported beef, Japanese beef production systems are required to rapidly change from quality to quantity. A decrease in feed intake, particularly late fattening period, is the biggest beef production problem that we have to face. Changes of circulating appetite-regulating hormones, leptin (satiety signal) and ghrelin (orexigenic signal), were observed in fattening Japanese Black steers and the relation between backfat accumulation and regulating hormones was studied. Nine Japanese Black steers from 13 to 20 months of age were examined. Blood samples were collected every 4 weeks. Concentrations of leptin and ghrelin in plasma were analyzed using a radioimmunoassay kit. Every 4 week, backfat thicknesses were measured by real-time ultrasound scanning. This study demonstrated that plasma concentrations of leptin increased with age, and were positively correlated with backfat thickness during the experimental period. Cross-correlation coefficient between backfat thickness and plasma leptin concentration 4 weeks later was higher than plasma concentration 0 or 8 weeks later; circulating leptin levels changed in parallel with the changes in backfat thickness 4 weeks before. This resulted from a positive correlation to plasma leptin concentration and mRNA expression in subcutaneous fat. Plasma concentrations of ghrelin tended to decrease after 15 month of age, and there was a low correlation between plasma ghrelin and leptin concentrations. These results suggest that by controlling the accumulation of subcutaneous fat there is a possibility of controlling circulating leptin levels in fattening beef cattle. (author abst.) |
|
|
|
Related Articles;
|
|
