Estimation of substrate-energetic fluxes in lactating cows
Journal Title: Journal of Animal and Feed Sciences - Year 2010, Vol 19, Issue 1
Abstract
In this article an algorithm estimating the basic metabolic fluxes in lactating cows is described that uses data of substrates absorption, heat production, respiratory quotient and milk productivity. The flux diagram permits to estimate parameters which are very difficult to measure in physiological experiments, including rates of oxidation of substrates to CO2 and their interconversions (synthesis of long-chain fatty acids from acetate, gluconeogenesis from amino acids, etc.). The developed model was verified in an experiment carried out on two groups of lactating cows with measurements of energy balance, heat production and respiratory quotient (СО2 /О2 ) during the periods of 40-45, 60-65 and 90-95 days of lactation. The estimates of oxidation rates obtained for amino acids, glucose, long chain fatty acids and acetate do agree with literature data. The analysis of combined data revealed a negative correlation between oxidation rates of glucose and acetate (r=0.91) and between substrate groups (long chain fatty acids + butyrate) and (glucose + acetate) (r=0.75).
Authors and Affiliations
G. G. Cherepanov, V. I. Agaphonov
Keywords
Related Articles
- EP ID EP73436
- DOI -
- Views 101
- Downloads 0
Peripheral ghrelin inhibits feed intake through hypothalamo-pituitary-adrenal axis-dependent mechanism in chicken
It is known that centrally injected ghrelin is an anorexigenic peptide in chicken. Its activity is not mediated by NPY/AgRP - producing neurons but through the corticosterone releasing hormone (CRH) - expressing neurons...
Nutritional and energy value of wheat cultivars for broiler chickens
Wheat (Triticum aestivum L.) grain of 6 spring and 3 winter cultivars was analysed for nutrients content including amino acids, fatty acids, starch, sugars and fibre, and dietary fibrę fractions. Digestibility of main nu...
Annual changes in the concentrations of free triiodothyronine, progesterone and testosterone in prepubertal red deer (Cervus elaphus elaphus) males and females
The aim of the study was to analyse the annual changes in the concentration of free triiodothyronine, progesterone and testosterone in the serum of prepubertal red deer males and females. Blood was collected monthly from...
Evaluation of chemical composition, in situ degradability and in vitro gas production of ensiled and sun-dried mulberry pomace
The study was conducted to evaluate the nutritive value of mulberry pomace (MP) treated with sun-drying (SD), ensiling (EN), and ensiling with a Lactobacillus additive (ELA), respectively. The chemical composition, in si...
Possibility of utilization of two Aegilops sp. to enhance the nutritive value of triticale
Study was undertaken to determine the possibility of improving the nutritive value of triticale by crossing it with two species of Aegilops. Materials for this study comprised of 5 triticale recombinants with Aegilops cr...