4,295 research outputs found
An evaluation of traits other than production and its association with the survival of dairy cows milked once a day in New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Master of AgriScience at Massey University, Palmerston North, New Zealand
New Zealand dairy cows have traditionally been milked twice a day (TAD). However, an
increasing number of dairy farms have shifted to once a day (OAD) milking in the last few
years for several reasons. A particular emphasis has been placed on the cow’s conformation
and its management during the milking routine in OAD dairy farms, as these factors might
have altered the culling decisions of herds after shifting from TAD to OAD milking. This thesis
evaluates production traits and traits other than production (TOP) in the herd of Massey
University Dairy 1 since the start of OAD milking and for three consecutive seasons (2013-
2015), with an assessment of the influence that these traits have on the cow’s survival. Results
showed a significant effect of breed, season and lactation on TOP. The scores for most udder
traits showed a gradual decrease over lactations. The main reasons for culling were low fertility
(37.2%), poor udder conformation (19.9%) and low production (12.8%). Hazard ratios from a
Cox proportional hazard model showed that Holstein-Friesian and crossbred cows had a higher
likelihood of culling than Jerseys, which also had the highest scores for most udder traits. For
some TOP, such as adaptability to milking, rump angle and udder support, higher scores were
associated with a lower likelihood of culling. However, intermediate scores were optimum for
traits such as body capacity and leg conformation. The results of this thesis are the first to show
culling reasons and risk factors for survival in cows recently shifted from TAD to OAD. The
analyses of TOP over seasons and over lactations are also unique to this thesis as most studies
on this topic only include TOP on first lactation cows. The findings of this thesis indicate that
TOP would have a higher priority to make culling decisions in OAD herds during the transition
from TAD to OAD milking, compared to TAD herds and also established OAD herds that have
used this milking frequency for several seasons. Furthermore, besides body capacity and udder
support, traits such as adaptability to milking, rump angle and leg conformation could also
potentially be included in a new selection index for OAD dairy cattle
Spinning Relativistic Particle in an External Electromagnetic Field
The Hamiltonian formulation of the motion of a spinning relativistic particle
in an external electromagnetic field is considered. The approach is based on
the introduction of new coordinates and their conjugated momenta to describe
the spin degrees of freedom together with an appropriate set of constraints in
the Dirac formulation. For particles with gyromagnetic ratio , the
equations of motion do not predict any deviation from the standard Lorentz
force, while for an additional force, which corresponds to the
magnetic dipole force, is obtained.Comment: Latex file, 11 page
The Pageant March : Triumphal Procession
https://digitalcommons.library.umaine.edu/mmb-ps/1290/thumbnail.jp
Constraints on the braneworld from compact stars
According to the braneworld idea, ordinary matter is confined on a
3-dimensional space (brane) that is embedded in a higher-dimensional space-time
where gravity propagates. In this work, after reviewing the limits coming from
general relativity, finiteness of pressure and causality on the brane, we
derive observational constraints on the braneworld parameters from the
existence of stable compact stars. The analysis is carried out by solving
numerically the brane-modified Tolman-Oppenheimer-Volkoff equations, using
different representative equations of state to describe matter in the star
interior. The cases of normal dense matter, pure quark matter and hybrid matter
are considered.Comment: 13 pages, 11 figures, 2 tables; new EoS considered, references and
comments adde
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