Protein level for alfalfa and corn silage-based diets: II. Nitrogen balance and manure characteristics

Journal of Dairy Science
M A Wattiaux, K L Karg

Abstract

This N balance study was completed with 48 multiparous Holstein cows (body weight [BW] = 653 kg; days in milk = 89) blocked by calving date and assigned to a 2 x 2 factorial arrangement of dietary treatments. The total mixed ration included alfalfa silage (AS) or corn silage (CS) as the primary forage source (41 and 14% vs. 14 and 41% of diet dry matter (DM), respectively) and were formulated for recommended (RP) or excessive (HP) amounts of rumen degradable protein (RDP) and rumen undegradable protein (RUP) according to the guidelines of the National Research Council (NRC). Crude protein (CP) averaged 16.5, 18.0, 16.4, and 17.3% for the AS-RP; AS-HP; CS-RP; and CS-HP diet, respectively (DM basis). Regardless of primary forage source, the reduction in dietary CP to the NRC guidelines tended to improve milk yield (43.4 vs. 41.0 kg/d) but did not alter 3.5% fat-corrected milk (37.0 kg/d) or milk true protein yield (1167 g/d). In this trial, cows fed the CS-based diets consumed less DM than those fed the AS-based diets in part because of rumen acidosis. The adverse effect of low rumen pH was accompanied by an increase in urinary N (UN) as a percentage of N intake, but did not alter milk yield. Notwithstanding partial confounding, ...Continue Reading

References

Aug 1, 1992·Journal of Dairy Science·E J DePeters, J P Cant
Oct 6, 1997·Journal of Dairy Science·T R Dhiman, L D Satter
Jan 22, 1998·Journal of Dairy Science·V A WilkersonD P Casper
Apr 21, 1998·Journal of Biopharmaceutical Statistics·G C Wei
Jul 1, 1999·Journal of Dairy Science·E F GarrettG R Oetzel
Nov 9, 2001·Journal of Dairy Science·C K ReynoldsJ R Newbold
Nov 9, 2001·Journal of Dairy Science·A J Kauffman, N R St-Pierre
Feb 28, 2002·Journal of Dairy Science·R A KohnE Russek-Cohen
Jun 28, 2002·Journal of Dairy Science·J S JonkerJ High

❮ Previous
Next ❯

Citations

Jun 21, 2016·Journal of Dairy Science·A C B JohnsonE Kebreab
Jan 26, 2008·Journal of Dairy Science·J M PowellT H Misselbrook
Oct 19, 2005·Journal of Dairy Science·T F Gressley, L E Armentano
Feb 25, 2014·The Journal of Veterinary Medical Science·Tetsuo TamuraHideto Nishiki
Sep 18, 2020·Tropical Animal Health and Production·Sirley Carrillo-HernándezCarlos Manuel Arriaga-Jordán
Jan 8, 2008·Journal of Environmental Quality·J M PowellM D Casler
Jun 12, 2017·Journal of Dairy Science·H A Aguirre-VillegasR Larson
Jul 19, 2017·Animal : an International Journal of Animal Bioscience·V E Cabrera

❮ Previous
Next ❯

Related Concepts

Related Feeds

Birth Defects

Birth defects encompass structural and functional alterations that occur during embryonic or fetal development and are present since birth. The cause may be genetic, environmental or unknown and can result in physical and/or mental impairment. Here is the latest research on birth defects.

Angelman Syndrome

Angelman syndrome is a neurogenetic imprinting disorder caused by loss of the maternally inherited UBE3A gene and is characterized by generalized epilepsy, limited expressive speech, sleep dysfunction, and movement disorders. Here is the latest research.