Growth models developed by Pennsylvania State University (Penn State) extension
services for Holstein and Jersey heifer height and weight were evaluated using OSU dairy
herd heifer data. The purpose of this study was to determine the ability of the models to
predict heights and weights of heifers in the OSU...
Evaluations of body form and measures of milk production were
recorded for 188 Holstein lactations and 77 Jersey lactations in the
Oregon State University Dairy Herds. Components of body form
included general appearance, dairy character, body capacity, and
mammary system and 34 sub-components of these four traits plus body
weight...
Although the occurrence of ketosis is a postpartum phenomenon, recent studies have
focused on the prepartum period as key in the development of the disorder. Indicators of
prepartum energy status, such as depressed dry matter intake (DMI) and elevated plasma
non-esterified fatty acid (NEFA) concentrations have been associated with the...
The production level of dairy cows fed corn cannery waste
silage was investigated during a 305 day lactation study. Eighteen
Holstein cows were paired according to their probable producing
ability and field corn silage was fed to the control pairmates, Forage
analyses (DM, CP, CF, and nitrates) were determined on...
Four experiments were conducted (1961-1964) for the primary
purpose of studying the milk and milk constituent yields of dairy cows
under dry lot and pasture systems of management. The secondary
purpose was to compare the health and breeding performance of cows
under these two systems.
Ninety-eight cows of the Holstein...
This project was designed to test the biological effects of three
levels of dietary protein (12.7, 16.3 and 19.3% CP on a dry matter
basis) on high producing Holstein-Friesian dairy cows. Forty five
second lactation or older cows that showed the potential to produce
over 31.75 kg (70 lbs) per...
The objective of this study was to evaluate triticale
grain fed as a concentrate in the diet of high producing
dairy cows. A lactation study, in vitro dry matter
digestibilities and a preliminary physiological effects
trial were conducted to evaluate triticale and used to
make feeding recommendations.
In the lactation...
Ruminal microorganisms require nitrogen and energy for microbial crude protein
(MCP) synthesis. High-quality grass provides an excess of readily available proteins
relative to available carbohydrates which reduces the conversion efficiency of grass
protein to MCP. Nonstructural carbohydrates (NSC) are the primary source of readily
available energy. Objectives of trial 1...
A field study was conducted to assess phosphorus (P) and potassium (K) concentrations of both lactating and dry cow diets on Oregon's dairies. Thirty-seven dairy farms, located in western Oregon, were grouped according to geographic region, valley (V) or coast (C), and herd size, small (S) or large (L). Farms...
A four months continuous feeding trial was conducted
to evaluate Canola meal as a single protein supplement in
complete dairy rations. Thirty high producing Holstein
cows in the second week of lactation were randomly alloted
in groups of ten to one of three isonitrogenous (15% CP)
and isocaloric (1.6 Mcal/kg...