Volume 57 Supplement 1
Effects of feed intensity and breed on postpartum blood metabolites
© Ntallaris et al. 2015
Published: 25 September 2015
In dairy cows, postpartum negative energy balance impairs fertility.
The aim of this study was to investigate the influence of high and low feed intensity starting one month before first calving on blood metabolites of energy balance in Holstein (H, n=14) and Swedish Red dairy breed (SRB, n=14) kept in a loose housing system.
Material and methods
The control group (C, n=12) was fed a diet targeting high production (35kg/day Energy-Corrected Milk, ECM). The lower feeding intensity (L, n=12) was achieved by giving -50% concentrate to target 25kg/day ECM. Blood was sampled every 2 weeks until 2 months postpartum and then once a month until Day 120. Plasma was kept frozen until analysis for glucose, insulin and non-esterified fatty acids (NEFA) concentrations. Data were analyzed with Mixed linear models.
For glucose, effects of breed (p<0.01) and time (p=0.01) were observed. Postpartum glucose levels were constantly higher in SRB when compared to H cows (56.7 ±1.9 vs 49.9 ±2.0 mg/dl). For insulin, there was an interaction between diet and time (p<0.03); concentrations being higher in C than in the L group until 3 months and not different later. For NEFA's an effect of time was observed (p=0.001) and a tendency (p<0.10) for interaction between breed and diet. Holstein tended to have lower NEFA concentrations with the low diet whereas the inverse was observed for SRB.
These results indicate that feed intensity and breed influence energy mobilization. However, no relationships were found with reproductive variables.
The study was financed by “PROLIFIC” EU grant N°311776.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.