Effects of Different Concentrate Feed Proportions on Ruminal Ph Parameters, Duodenal Nutrient Flows and Efficiency of Microbial Crude Protein Synthesis in Dairy Cows During Early Lactation

Animals

Jürgen Hummel¹  Heiner Westendarp²  Annette Zeyner³  Katharina Bünemann⁴  Ulrich Meyer⁴  Julia Hartwiger⁴  Dirk von Soosten⁴  Rolf Schmitz⁴  Sven Dänicke⁴  Maren Johannes⁴  Liane Hüther⁴ 

[1] Department of Animal Sciences, University of Göttingen, 37077 Göttingen, Germany;Faculty of Agricultural Sciences and Landscape Architecture, University of Applied Sciences, 49076 Osnabrück, Germany;Institute of Agricultural and Nutritional Sciences, Martin-Luther-University Halle-Wittenberg, 06120 Halle (Saale), Germany;Institute of Animal Nutrition, Friedrich-Loeffler-Institut (FLI), Federal Research Institute for Animal Health, 38116 Braunschweig, Germany;

关键词: dairy cows;    concentrate feed proportion;    ruminal ph;    nutrient flows;    microbial efficiency;    postpartal period;   

DOI  :  10.3390/ani10020267

来源: DOAJ

【 摘 要 】

The aim of the study was to examine different pH parameters, such as variations throughout the day, depending on differing concentrate feed proportions. Moreover, special attention was payed to individual variation in microbial efficiencies (microbial crude protein/fermented organic matter) and their relation to ruminal pH, nutrient flows and digestibilities. For this, cows were grouped according to microbial efficiency (more, n = 5, vs. less efficient cows, n = 4). After calving, thirteen ruminally cannulated pluriparous cows, including nine duodenally cannulated animals, were divided into groups offered rations with a lower (35% on dry matter basis, n = 7) or a higher (60% on dry matter basis, n = 6) concentrate feed proportion. Ruminal pH parameters were assessed continuously by using intraruminal probes. Nutrient flows, nutrient digestibility and microbial efficiency were determined for duodenally cannulated cows. For most ruminal pH parameters it seemed that individual variability was higher than the treatment effect. However, a positive relationship between actual concentrate intake and diurnal pH fluctuations was found. Besides, the effect of individually different microbial efficiencies was assessed. Again, there were no group differences for pH parameters. However, nutrient flows were significantly higher in more efficient cows, whereas digestibilities were lower in in more efficient cows.

【 授权许可】

Unknown