The pre calving CTRL diet contained higher NDF (only far off) and higher NEL than the BUT diet (far off and close-up), but both diets were similar for DPI and RDPB (Table 1). During the post calving period the dietary composition was similar for CTRL and BUT. Furthermore daily intake of NEl (149±5 and 147±5 MJ/d), DPI (2207±45 and 2178±55 g/d) and RPDB (-128±75 and -139±102 g/d) did not differ between groups post-calving.
Daily DM intake was not different between treatment groups. The mean milk yield of BUT cows was significantly lower than of CTRL cows, but fat and protein content were significantly higher in BUT group, which equalized the FPCM production as well as daily fat and protein production. The fact that cows in the BUT group seemed to be more sensitive to metabolic problems post calving (two cows with displaced abomasum in BUT and none in CTRL) might partially explain the lower milk yield in the BUT group. Previous work of Pires et al. (2007) showed that increasing NEFA augment insulin resistance in high producing dairy cows. Nevertheless, we found significantly lower blood glucose levels 2h and 4h after feeding in BUT cows. Ongoing analyses of blood NEFA and butyric acid concentration might assist in explaining these findings.
In conclusion, prolonged supplementation with butyrate leads to a lower milk yield. However, daily fat and protein production were not different because of the increased milk fat and protein content of the BUT group. Additionally, prolonged butyrate supplementation resulted in lower post calving blood glucose levels
|Vertaalde titel van de bijdrage||Het effect van langdurige butyraat supplementatie bij hoogproductieve melkkoeien rond de partus.|
|Titel||Proceedings of 38th Animal Nutrition Forum|
|Uitgeverij||38th Animal Nutrition Research Forum|
|Publicatiestatus||Gepubliceerd - 21-mei-2013|
|Evenement||38 th Animal Nutrition Research Forum (2013) - Roeselare, België|
Duur: 21-mei-2013 → 21-mei-2013