+ Site Statistics
References:
54,258,434
Abstracts:
29,560,870
PMIDs:
28,072,757
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Effect of dietary energy source and level on nutrient digestibility, rumen microbial protein synthesis, and milk performance in lactating dairy cows



Effect of dietary energy source and level on nutrient digestibility, rumen microbial protein synthesis, and milk performance in lactating dairy cows



Journal of Dairy Science 98(10): 7209-7217



This study was conducted to examine the effects of dietary energy source and level on intake, digestion, rumen microbial protein synthesis, and milk production in lactating dairy cows, using corn stover as a forage source. Eight multiparous Holstein cows, 4 of which were fitted with rumen cannulas, were evaluated in a replicated 4 × 4 Latin square design, with each period lasting 21 d. The cows were randomly assigned into 4 treatment groups: low-energy (LE) ground corn (GC), LE steam-flaked corn (SFC), high-energy (HE) GC, and HE SFC. Changes to ruminal energy degradation rates were induced by feeding the cows diets of either finely ground corn or SFC as components of diets with the same total energy level. Milk yield, milk protein content and yield, and milk lactose yield all increased in response to higher levels of dietary energy, whereas contents of milk fat and lactose were unaffected. Cows fed HE diets had a higher crude microbial protein yield and total-tract apparent digestibility than those receiving LE diets. Milk yield, milk protein yield, and microbial protein yield were also higher when SFC replaced GC as the main energy source for lactating cows fed LE diets. These results suggest that an increased dietary energy level and ruminal degradation rate are beneficial to milk protein production, which we suggest is due to increased yields of microbial proteins, when cows are fed corn stover as a dietary forage source.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 057702686

Download citation: RISBibTeXText

PMID: 26254527

DOI: 10.3168/jds.2015-9312


Related references

Effects of dietary energy and protein sources on the nutrient metabolism and microbial protein synthesis: II. Effects of combinations of formaldehyde treated-energy feed and protein source on digestibility and nutrient flow to duodenum, and rumen microbial protein synthesis in dairy cow. Korean Journal of Animal Nutrition & Feedstuffs 20(2): 169-180, 1996

Effects of dietary forage sources on rumen microbial protein synthesis and milk performance in early lactating dairy cows. Journal of Dairy Science 96(3): 1727-1734, 2013

Effects of dietary energy and protein sources on the nutrient metabolism and microbial protein synthesis. I. Effects of combinations and formaldehyde treated-energy feed and protein source on characteristics of rumen fermentation and blood composition in dairy cows. Korean Journal of Animal Nutrition & Feedstuffs 20(2): 159-168, 1996

Effect of synchronizing starch sources and protein (NPN) in the rumen on feed intake, rumen microbial fermentation, nutrient utilization and performance of lactating dairy cows. Asian Australasian Journal of Animal Sciences 17(10): 1400-1410, 2004

Effect of synchronizing starch sources and protein (NPN) in the rumen on feed intake, rumen microbial fermentation, nutrient utilization and performance of lactating dairy cows. Asian-Australasian Journal of Animal Sciences 17(10): 1400-1410, 2004

The effect of by-product inclusion level on milk production, nutrient digestibility and excretion, and rumen fermentation parameters in lactating dairy cows offered a pasture-based diet. Journal of Dairy Science 100(2): 1055-1062, 2016

Effects of dietary energy level and protein source in ruminants iv. effects of metabolizable energy level and protein source of concentrate on rumen passage rate of diet and rumen microbial protein synthesis in sheep. Korean Journal of Animal Nutrition and Feedstuffs 16(2): 53-62, 1992

Effect of dietary crude protein, rumen-undegraded protein and rumen-protected methionine on milk production of lactating dairy cows. Journal of Animal Science 84: 402-402, 2006

Effect of high fiber energy supplements on nutrient digestibility and milk production of lactating dairy cows. Journal of Dairy Science 74(3): 991-995, 1991

Effect of carbohydrate source and cottonseed meal level in the concentrate on feed intake, nutrient digestibility, rumen fermentation and microbial protein synthesis in swamp buffaloes. Asian-Australasian Journal of Animal Sciences 26(7): 952-960, 2014

Isobutylidene diurea as an NPN source for ruminants. 1. Rumen fermentation, digestibility of the nutrients and microbial protein synthesis in dairy cows. Archiv für Tierernahrung 31(1): 45-56, 1981

Replacing alfalfa hay with dry corn gluten feed and Chinese wild rye grass: Effects on rumen fermentation, rumen microbial protein synthesis, and lactation performance in lactating dairy cows. Journal of Dairy Science 100(4): 2672-2681, 2017

Addition of supplemental dietary fat in substitution of forage in rations for lactating dairy cows: Nutrient digestibility and rumen function. Veterinaria - Mexico 30(2): 135-141, April-June, 1999

Effects of method of barley grain processing and source of supplemental dietary fat on duodenal nutrient flows, milk fatty acid profiles, and microbial protein synthesis in dairy cows. Journal of Dairy Science 95(10): 5961-5977, 2013

Effect of dietary nitrate level on enteric methane production, hydrogen emission, rumen fermentation, and nutrient digestibility in dairy cows. Journal of Dairy Science 99(8): 6191-6205, 2017